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Journal Cover   Journal of Applied Ichthyology
  [SJR: 0.482]   [H-I: 36]   [6 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0175-8659 - ISSN (Online) 1439-0426
   Published by John Wiley and Sons Homepage  [1597 journals]
  • Factors affecting morphological development of the sagittal otolith in
           juvenile and adult small yellow croaker (Larimichthys polyactis Bleeker,
    • Abstract: The morphology and morphometrics of the sagittal otoliths of small yellow croaker (Larimichthys polyactis) from the southern Yellow Sea were investigated. Study objectives were to evaluate the shape variability and morphometric variables of sagittae of juveniles and adults as related to developmental changes and habit shift. A total of 152 fish were sampled from April to June of 2012 and 2013, along the coastal waters of the Lüsi spawning ground in the southern Yellow Sea. Changes in otolith shapes from the juvenile to the adult were presented with the rim development through the entire‐lobed‐entire transition and with the curvature of the cauda toward the ventral margin. The otolith elongation in the juvenile stage occurred at 10–20 mm standard length (SL) and was likely associated with the formation of otolith accessory growth centers from larvae to juvenile. The L. polyactis sagittal otoliths acquired their definitive shape at 130 mm SL maturity. Ontogeny on otolith shape might be related, for example, to the factors of metamorphic development, feeding habitat, and ambient water salinity, which varied throughout the growth of L. polyactis.
      PubDate: 2015-10-01T01:06:04.46102-05:0
      DOI: 10.1111/jai.12914
  • Dietary metyrapone blocks cortisol synthesis in pacu, Piaractus
           mesopotamicus (Holmberg, 1887), stressed by air exposure
    • Authors: F. S. Zanuzzo; E. C. Urbinati
      Abstract: Tested was the efficiency of dietary metyrapone (MTP) in the inhibition of cortisol biosynthesis, as a tool to elucidate the effects of this hormone in the tropical fish pacu (Piaractus mesopotamicus H.) during air‐exposure‐induced stress. Moreover, MTP efficiency was shown to be affected by both the dose and time of administration and that a daily dose of 30 mg kg−1 body weight for 10 days reduced the levels of circulating cortisol in stressed fish. The tested method of MTP administration, including the concentration and the time of administration, efficiently regulated cortisol synthesis in a non‐invasive manner.
      PubDate: 2015-10-01T01:05:39.189979-05:
      DOI: 10.1111/jai.12916
  • Dietary inclusion of mussel meal enhances performance and improves feed
           and protein utilization in common sole (Solea solea, Linnaeus, 1758)
    • Authors: F. Mongile; L. Mandrioli, M. Mazzoni, M. Pirini, A. Zaccaroni, R. Sirri, L. Parma, P. P. Gatta, G. Sarli, A. Bonaldo
      Abstract: The present study was carried out to test different mussel meal (MM) dietary levels in combination with fishmeal (FM) on the growth performance, fatty acid composition and liver histology of common sole, Solea solea juveniles to highlight the growth potential of this species. Four isoproteic (53%) and isolipidic (11%) pelletized diets were formulated to contain graded levels of mussel meal, MM0 (0%), MM25 (25%), MM50 (50%) and MM75 (75%), up to 75%. Sole juveniles (initial individual mean body weight 13.1 ± 2.3 g, n = 840) were fed to satiation for 91 days. Seventy fish per tank (500‐L, 0.64 m2 bottom surface) were reared in 12 tanks (3 tanks per treatment) at 20 ± 1°C. Diets containing MM (MM25, MM50 and MM75) gave a significantly higher specific growth rate (SGR, 1.27 ± 0.01, 1.38 ± 0.06 and 1.40 ± 0.05, respectively), higher feed intake and lower feed conversion rate (FCR, 1.09 ± 0.01, 1.00 ± 0.04 and 0.98 ± 0.02, respectively) when compared to the FM‐based diet (MM0, SGR, 0.98 ± 0.11, FCR, 1.52 ± 0.13). Carcass proximate composition was not influenced by dietary treatments, with the exception of the significantly lower lipid content in the MM75 group. Protein efficiency ratio (PER) and gross protein efficiency (GPE) were significantly improved by the mussel meal inclusion (PER, 1.29 ± 0.12, 1.76 ± 0.01, 1.89 ± 0.06, 1.95 ± 0.08; GPE, 25.29 ± 1.85, 33.38 ± 0.89, 35.96 ± 1.36, 36.59 ± 1.05 in MM0, MM25, MM50 and MM75, respectively). A significant decrease in the viscerosomatic index was observed in fish fed with MM50 and MM75 in comparison to MM0. The hepatosomatic index of fish fed with MM0 and MM25 was higher than that of fish fed with MM75, although the histological examination of liver parenchyma in all experimental groups showed a uniformly abundant accumulation of lipid droplets. Carcass fatty acid composition was significantly affected by dietary treatments, reflecting the dietary fatty acid profile. According to these results, the inclusion of MM in experimental FM‐based diets improved the performance and feed utilization of common sole juveniles. The inclusion of MM in the present trial allowed a higher SGR than that registered in previous growth trials on common sole. This study could provide useful information to detect effective ingredients for practical diets in Solea solea. It also seems advisable to consider an inclusion of at least 25% MM in the experimental reference diet to be used for further application towards the development of specific diets for this species.
      PubDate: 2015-09-28T02:10:57.952867-05:
      DOI: 10.1111/jai.12895
  • Length‐weight and length‐length relationships of the genus
           Alosa (Clupeoidei: Clupeiformes: Clupeidae) along the southern Caspian Sea
    • Abstract: Length–weight (LWR) and length–length (LLR) relationships were estimated for four shad species of the genus Alosa, reported from along the southern Caspian Sea coast, north of Iran in a study from March 2014. Two of these species are endemic to the Caspian Sea. The length–weight parameter b for these species ranged from 2.99 to 3.24, with regression coefficients (r2) ranging from 0.91 to 0.99. All LLRs were highly significant (r2 > 0.96).
      PubDate: 2015-09-28T02:06:14.101016-05:
      DOI: 10.1111/jai.12908
  • Microsatellites from the genome and the transcriptome of the tetraploid
           Adriatic sturgeon, Acipenser naccarii (Bonaparte, 1836) and
           cross‐species applicability to the diploid beluga sturgeon, Huso
           huso (Linnaeus, 1758)
    • Authors: E. Boscari; M. Vidotto, D. Martini, C. Papetti, R. Ogden, L. Congiu
      Abstract: Ninety‐five microsatellite loci were isolated from the output of two Next Generation Sequencing projects: a genomic Illumina RADSeq and a transcriptomic Roche 454 cDNA sequencing of the Adriatic sturgeon (Acipenser naccarii). From a total of 7697 loci identified, 72 were characterized and 57 were polymorphic in the tetraploid A. naccarii, providing new markers suitable for parental allocations to be performed for future conservation actions. Loci isolated from the transcriptome showed a higher level of polymorphism, which could be related to the different sequencing approaches used. Notably, a higher rate of duplication was observed in the transcribed loci, pointing to a preferential retention of sequences with a functional role after whole genome duplications occurred in sturgeons. Cross‐species amplification of these markers was also assessed in the diploid beluga sturgeon (Huso huso), with the aim of setting up a panel of markers to be applied in future conservation programmes regarding this species.
      PubDate: 2015-09-22T07:06:32.793798-05:
      DOI: 10.1111/jai.12906
  • Parasites component community in wild population of Pterophyllum scalare
           Schultze, 1823 and Mesonauta acora Castelnau, 1855, cichlids from the
           Brazilian Amazon
    • Abstract: The aim of the present study was to compare the component parasite communities of the Pterophyllum scalare and Mesonauta acora cichlids in the Amazon River system in northern Brazil. From September to December 2012, 42 specimens of P. scalare and 38 specimens of M. acora were captured using hand nets and gillnets in the Igarapé Fortaleza basin, a tributary of the Amazon River in the state of Amapá. Of the P. scalare specimens examined, 97.6% were parasitized by Ichthyophthirius multifiliis, Tripartiella sp., Trichodina nobilis, Gussevia spiralocirra, Posthodiplostomum sp., Capillaria pterophylli, Ichthyouris sp. and Gorytocephalus spectabilis. Similarly, all specimens of M. acora were parasitized by I. multifiliis, Tripartiella sp, T. nobilis, Sciadicleithrum joanae, Posthodiplostomum sp., Pseudoproleptus sp., Ichthyouris sp. and G. spectabilis. However, for both hosts the dominance was of I. multifiliis and with an overdispersion of parasites. Parasite communities of P. scalare and M. acora were similar and only Pseudoproleptus sp. and Posthodiplostomum sp. were larvae. Brillouin diversity, parasite species richness and evenness were higher for M. acora than for P. scalare, which presented a negative correlation of parasite abundance with body size. Both cichlid species had parasite communities characterized by low diversity and low species richness, with a predominance of ectoparasite species and greatest richness of helminth species, with a low abundance of endoparasites. This was the first study on the parasite diversity in wild P. scalare and M. acora.
      PubDate: 2015-09-22T07:04:14.826271-05:
      DOI: 10.1111/jai.12903
  • Length‐weight relationships of five fish species from the Hongshui
           River, China
    • Abstract: The length‐weight relationships (LWRs) were determined for five Chinese endemic fish species caught by electrofishing, cast nets (mesh size 1 cm) and gillnets (mesh size 4 cm) in the Hongshui River during June and July 2011 and October to November 2012. These are the first LWRs records for these five little‐known species.
      PubDate: 2015-09-22T06:59:12.224802-05:
      DOI: 10.1111/jai.12896
  • New inland sites for the Mediterranean killifish (Aphanius fasciatus
           Valenciennes, 1821) in the Sahara Desert of Algeria
    • Authors: R. Chaibi; A. Si Bachir, H. Chenchouni
      Abstract: The current study aims to update the range of Aphanius fasciatus occurring in inland aquatic systems, and to characterise the length–weight relationship of specimens caught in inland waters of the Northern Sahara of Algeria. Although the known distribution of A. fasciatus is restricted to coastal waters including islands of the Mediterranean region, visits to 39 hydrosystems in Northeast Algeria revealed the presence of the species at two sites: Oued Still and Lake Temacine. Both sites are in the Sahara Desert of Algeria, where the climate is hot and hyperarid. The surveyed populations perform their entire life cycle at the same sites. Analysis of a sample composed of 27 individuals captured in Oued Still allowed determination of the length–weight relationship. On average, females measured 4.2 ± 0.6 cm in length and weighed 1.1 ± 0.5 g; males were 3.2 ± 0.6 cm and 0.5 ± 0.2 g. Growth parameters of the von Bertalanffy equation for A. fasciatus were estimated at Lt = 5.5145 (1−exp (−0.341(t−0.0049))), Wt = 2.6692 (1−exp (−0.271t))3.
      PubDate: 2015-09-22T06:57:33.133105-05:
      DOI: 10.1111/jai.12892
  • Length–weight relationships for 13 fish species from a coastal
           artisanal fishery at Cape Verde peninsula (Senegal)
    • Abstract: Presented are length–weight relationships for 13 fish species captured by the coastal artisanal fishery at Yoff, a suburb close to Dakar (Senegal). Data were collected from April 2010 until March 2011. This work is thought to be the first reference of length–weight relationships for eight of the species. The b values estimated ranged from 2.51 to 3.47.
      PubDate: 2015-09-22T06:54:24.114184-05:
      DOI: 10.1111/jai.12890
  • The effects of gradual or abrupt changes in salinity on digestive enzymes
           activity of Caspian kutum, Rutilus kutum (Kamensky, 1901) larvae
    • Authors: N. Gheisvandi; A. Hajimoradloo, R. Ghorbani, S. H. Hoseinifar
      Abstract: This study investigates the effects of gradual or abrupt changes in rearing salinity on food transit time and digestive enzymes activity of Caspian kutum (Rutilus kutum) larvae. The larvae (532 ± 0.05 mg) were supplied and randomly allocated into 12 tanks at a density of 45 fish per tank. Experimental treatments were fresh water (salinity 0) [FW] as control, exposure to salinity 5 [T1], and gradual transfer to salinity 10 in two steps of first to 5 h, then and after 12 h to a salinity of 10 [T2], and abrupt change (direct transfer to a salinity of 10 [T3]). Results showed at 8 h after start of feeding that the larvae intestine was filled with food pellets except in treatment T1. Enzyme activity responded to salinity change as follows: the highest trypsin, amylase, and chymotrypsin activities were observed in T1; however, these were not significantly different to treatment T3 (P > 0.05). Trypsin activity peaks in the FW and T2 groups occurred 8 h after feeding, and in T3 and T1 groups 5 h after feeding. Peak chymotrypsin and alkaline phosphatase activity was observed 5 and 8 h after feeding in all experiments, respectively. The highest α amylase activity in FW and T2 groups occurred 5 h after feeding, while in T3 and T1 these peaks were observed 8 h after feeding. These results indicate that salinity had some noticeable effects on the activities of digestive enzymes after feeding.
      PubDate: 2015-09-22T06:53:25.747568-05:
      DOI: 10.1111/jai.12891
  • Biochemical and genetic characterization of European silver eels, Anguilla
           anguilla (Linnaeus, 1758), from the Comacchio lagoon (Italy)
    • Abstract: The European eel Anguilla anguilla has declined significantly over recent decades, exceeding its safe biological limits and probably reaching a historical minimum (1% of the 1960 recruitment level). Twenty‐three migrating females at the IV stage of silvering were collected from the Comacchio lagoon (Northern Italy); they showed high levels of cholesterol and triglycerides, probably due to lipid accumulation before migration across the Atlantic Ocean. Electrophoretic patterns showed high amounts of putative α and β globulins, probably due to high concentrations of lipoproteins. Genetic results obtained from a total of 49 specimens (20 from the Comacchio lagoon and 29 from Val Dogà) agree with the panmixia hypothesis, lacking any genetic differentiation over time and space at neutral loci. In conclusion, despite the small sampling and the population decline in recent years, high levels of variability were recorded.
      PubDate: 2015-09-22T06:52:06.144196-05:
      DOI: 10.1111/jai.12889
  • Evaluation of three capture techniques for invasive Micropterus salmoides
           (Lacépède, 1802) in a Neotropical reservoir: implications for
           population control and management
    • Authors: V. M. Ribeiro; R. R. Braga, V. Abilhoa, J. R. S. Vitule
      PubDate: 2015-09-22T06:51:11.890902-05:
      DOI: 10.1111/jai.12904
  • Fatty acid composition of eggs and semen of Ctenopharyngodon idella
           (Valenciennes, 1844) taken for culture trials from the Keban Dam Lake,
           Elazığ, Turkey
    • PubDate: 2015-09-12T04:35:52.281092-05:
      DOI: 10.1111/jai.12880
  • Issue Information
    • PubDate: 2015-09-08T00:46:30.352282-05:
      DOI: 10.1111/jai.12577
  • Age, growth, and reproduction of blackspot snapper Lutjanus fulviflammus
           (Forsskål 1775) around Yaeyama Islands, southern Japan, between 2010
           and 2014
    • Authors: T. Shimose; A. Nanami
      Abstract: Age, growth, and reproductive characteristics of blackspot snapper Lutjanus fulviflammus around the Yaeyama Islands (24°N, 124°E) in southern Japan were investigated between 2010 and 2014. Samples were caught by angling or purchased monthly at fish markets to cover all size ranges and seasons. Specimens consisted of 280 females (176–347 mm fork length), 177 males (193–325 mm), and 17 juveniles (42–128 mm). Spawning was confirmed from April to August by the presence of postovulatory follicles, which, based on the occurrence of yolked oocytes possibly also occurred in March and September. Maximum fork length and age in the specimens around Yaeyama Islands were 347 mm and 23 years for females and 325 mm and 21 years for males. These results were compared to those reported previously for the species in other regions by standardized criteria. Possible spawning duration of 7 months in the population around Yaeyama Islands is similar to that in New Caledonia (22°S, 5 months) and Okinawa Island (26°N, 6 months), but shorter than that in Tanzania (8°S) and the southern Arabian Gulf (25°N) (~12 months). The maximum body sizes and ages around Yaeyama Islands are also similar to the populations in New Caledonia and Okinawa Island (>300 mm FL, >20 years old), but larger/older than those in Tanzania and the southern Arabian Gulf (
      PubDate: 2015-09-07T23:55:42.811027-05:
      DOI: 10.1111/jai.12894
  • Optimization of the culture methods for nursing Chinese black sleeper
           (Bostrychus sinensis Lacépède, 1801) fry using an
           orthogonal array design
    • Authors: Y. T. Zhang; Z. Li, S. X. Chen, Y. Mao, W. S. Hong
      Abstract: Chinese black sleeper (Bostrychus sinensis) is a burrow‐dwelling fish found in intertidal mudflats. As a commercially important fish in southern China, the nursing of B. sinensis fry is a critical step for its farming. The growth and survival of B. sinensis fry are closely related to the stocking density, shelter and diet. In this study, 1575 healthy fry were used to investigate the effects of three factors, namely: diet, stocking density, and shelter on the survival rate (SR), specific growth rate (SGR) and condition factor (CF). The optimal combinations of three levels of each of these three factors (A1‐3, B1‐3 and C1‐3) were also determined, using an orthogonal array design of OA9 (34). After 50 days of nursing, the results showed that: (i) the best combinations for the three factors at their optimal levels were A1B1C2 or A1B1C3; (ii) factor A was the most important factor and had significant effects (P  0.05); (iii) the SGR, SR and CF of fry fed with commercial formulated feed (CFF) were significantly higher (P 
      PubDate: 2015-09-07T23:51:34.008281-05:
      DOI: 10.1111/jai.12893
  • Telestes miloradi Bogutskaya, Zupancic, Bogut & Naseka, 2012 and
           Delminichthys ghetaldii (Steindachner, 1882) re‐discovered in
           Croatia, requiring urgent protection
    • PubDate: 2015-09-04T02:27:24.367285-05:
      DOI: 10.1111/jai.12879
  • Laboratory test of suspended sediment effects on short‐term survival
           and swimming performance of juvenile Atlantic sturgeon (Acipenser
           oxyrinchus oxyrinchus, Mitchill, 1815)
    • Authors: J. L. Wilkens; A. W. Katzenmeyer, N. M. Hahn, J. J. Hoover, B. C. Suedel
      Abstract: Tested was the hypothesis that juvenile Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus) would exhibit no response in short‐term survival or swimming performance when exposed to varying concentrations of suspended sediment simulating dredge plumes in waterways where this species may be impacted by dredging operations. Sediment collected from Savannah Harbor, South Carolina, USA was used to simulate a worst‐case scenario. Juvenile sturgeon were contained for a 3‐day period in flow‐through aquaria, with limited opportunity for movement, in sediment of varying concentrations (100, 250 and 500 mg L−1 total suspended solids [TSS]) mimicking prolonged exposure to suspended sediment plumes near an operating dredge. Of the 90 fish exposed, 86 (96%) survived the test. Of the four fish that died, one was exposed to 250 TSS and three to 500 TSS. Swimming performance results indicated that nearly all fish were positively rheotactic. Critical swim speeds (Ucrits) were moderate, whether measured as absolute values (21–31 cm s−1) or as relative values (1.4–2.1 body lengths s−1), with no significant differences among treatments (F 
      PubDate: 2015-09-02T05:17:14.022844-05:
      DOI: 10.1111/jai.12875
  • Short‐term survival and dispersal of hatchery‐reared juvenile
           pallid sturgeon stocked in the channelized Missouri River
    • Authors: B. L. Eder; K. D. Steffensen, J. D. Haas, J. D. Adams
      Abstract: In the summer and fall of 2014, Nebraska Game and Parks Commission crews monitored juvenile pallid sturgeon, Scaphirhynchus albus (Forbes & Richardson, 1905) (age‐1 and age‐4) implanted with telemetry tags that were stocked in a side channel of the Missouri River in Nebraska, USA to gain knowledge into post‐stocking survival and dispersal. For this study, specific questions were asked: (i) what is the short‐term survival of stocked pallid sturgeon, (ii) do pallid sturgeon stocked in summer exhibit decreased survival rates due to increased water temperatures or high river discharge, and (iii) how quickly do pallid sturgeon disperse from a stocking site' Detection histories for two rounds were used to estimate apparent survival (Ø) and detection (p) rates using maximum likelihood estimators based on the standard mark‐recapture Cormack‐Jolly‐Seber model structure within program MARK. Overall apparent survival was 98.6% and dispersal was rapid; therefore, moratoriums on stocking pallid sturgeon during summer months or during high flow events do not appear to be warranted.
      PubDate: 2015-09-01T00:22:40.253327-05:
      DOI: 10.1111/jai.12881
  • Recruitment in Japanese sea bass, Lateolabrax japonicas (Cuvier, 1828):
           effects of timing on spawning and larval quality and quantity
    • Authors: M. S. Islam; M. Ueno, Y. Yamashita
      Abstract: This study aimed to elucidate the causes of variability in larval survival and juvenile abundance (recruitment) within and among cohorts of Japanese sea bass (JSB; Lateolabrax japonicus), a winter‐spawning temperate coastal marine fish. Larvae and settled individuals (settlers) belonging to four cohorts were collected from Tango Bay (the Sea of Japan coast) during eight sampling cruises in 2007 and 2008. Larvae were sampled in January and February each year using an ichthyoplankton net, and settlers were collected in February and March each year using a beam trawl. Age of individual larva and settlers was determined and growth history was back‐calculated from otolith microstructure, and the hatch date distribution was computed. Temperature, daily growth rate, size‐at‐age, hatch date, and density data of larvae and settlers allowed elucidating the effects of the timing of spawning and larval quantity and quality (growth rate and body size) on larval survival and recruitment within and among cohorts of JSB. Results showed that cohorts that hatched earlier in the season had higher quantity of larvae, experienced higher mean temperatures and survived better than cohorts hatched later. Recruitment variability among cohorts is determined largely by the initial quantity of larvae, as this explained >97% of the variability in recruitment among cohorts. Within cohorts, larger hatched larvae grew faster than their smaller conspecifics, and the bigger and faster growing larvae survived and settled. Results from this study suggest the following scenarios for recruitment of JSB: (i) earlier spawning in the season promotes larval survival since earlier cohorts are likely to encounter a better temperature and perhaps food conditions, and therefore recruit better than later cohorts; (ii) the initial quantity of larvae appears to be an important determinant of recruitment variability among cohorts; and (iii) the size‐ and growth‐related mechanisms operating during the larval phase appear to start at the time of the hatch.
      PubDate: 2015-09-01T00:18:51.246351-05:
      DOI: 10.1111/jai.12861
  • Length–weight relationships for 85 fish species from Guam
    • Authors: K. T. Kamikawa; E. Cruz, T. E. Essington, J. Hospital, J. K. T. Brodziak, T. A. Branch
      Abstract: Length–weight relationships (LWRs) were developed for 85 reef and bottom‐fish species from Guam. These are the first published LWRs for Guam, and include new LWRs for nine species lacking these relationships in FishBase.
      PubDate: 2015-08-27T05:52:05.119635-05:
      DOI: 10.1111/jai.12877
  • Characterization and SNP variation of the interleukin‐1β gene
           of bighead carp (Cyprinus pellegrini Tchang, 1933) and five strains of
           common carp [Cyprinus carpio Linnaeus (1758)] in China
    • Abstract: Single nucleotide polymorphisms of Interleukin‐1β (IL‐1β) have been reported as markers for susceptibility to infectious diseases in humans and livestock. The present study was to determine the genetic variation of this cytokine in six carp strains. Among the sampled individuals, a total of 13 SNPs, including eight in introns and five in coding regions, were identified at intron 5, exon 6, intron 6 and exon 7. Three positions of 1700, 1733 and 1934 resulted in variable amino acid changes with Phe to Tyr, Pro to Leu and Lys to Asn, respectively. Five positions with minor allele frequency (MAF) were larger than 0.05. Among 13 SNPs, eight positions of allele frequency and ten positions of genotypic frequency showed significant differences between some populations. The genotype distributions of the 13 SNPs were consistent with the assumption of the Hardy‐Weinberg equilibrium, with the exception of two positions in the Yibu and bighead carp (P 
      PubDate: 2015-08-27T05:51:44.848585-05:
      DOI: 10.1111/jai.12862
  • Seasonality affects the parasitism levels in two fish species in the
           eastern Amazon region
    • Abstract: Fish parasite communities have strong interactions with the environment, the host fish, and the aquatic invertebrate communities. Thus, factors directly involving their different life cycles, such as different host populations and environments, as well as seasonal fluctuations in water levels can cause different responses. The main factors structuring parasite communities may be the hydrodynamic variations, together with seasonal variations in the availability of infectious stages of parasites in the environment. The purpose of this study was therefore to investigate the influence of the rainy and dry seasons on parasite infracommunities in fish species in the Amazon River System of Brazil. Between October 2009 and April 2011, specimens of Colossoma macropomum and Colossoma macropomum × Piaractus brachypomus hybrids (tambatinga) were examined for the presence of parasites. The parasite communities were similar in these two species that both showed aggregate dispersion, although the hybrid specimens were less parasitized. For both hosts, the Brillouin diversity, species richness, evenness and Berger‐Parker dominance indices were similar in the rainy season and dry season, except that the Berger‐Parker dominance index for the C. macropomum × P. brachypomus hybrid was higher during the dry season. Ichthyophthirius multifiliis was the dominant parasite, followed by Piscinoodinium pillulare, in both hosts. However, C. macropomum had a higher prevalence and abundance in the dry season, while in the C. macropomum × P. brachypomus hybrid, only the I. multifiliis prevalence increased. The abundance of monogenean species (Anacanthorus spathulatus, Linguadactyloides brinkmanni, Mymarothecium and Notozothecium janauachensis) was higher during the dry season in the gills of C. macropomum. Despite overdispersion of the lernaeid Perulernaea gamitanae, a seasonal pattern was seen only in the C. macropomum × P. brachypomus hybrid, with higher prevalence in the rainy season. The low prevalence and abundance of the ectoparasites Tetrahymena sp., Trichodina sp. and Braga patagonica, as well as of the endoparasites Procamallalus (Spirocamallanus) inopinatus and Neoechinorhynchus buttnerae, were not affected by seasonality. This information is applicable in farming practice for these economically important fish, as it indicates the best time for prophylactic management and treatment against parasites, in order to prevent economic losses in fish farms.
      PubDate: 2015-08-26T07:40:07.531064-05:
      DOI: 10.1111/jai.12865
  • Anesthesia of wild female Persian sturgeon, Acipenser persicus (Borodin,
           1897) breeders during controlled propagation: effects on hematological
           parameters, stress response and reproductive performance
    • Authors: M. Mazandarani; S. M. Hoseini, R. Shahriari
      Abstract: This study examined the effects of anesthesia on the hematological and biochemical parameters as well as the reproductive performance of wild female Persian sturgeon, Acipenser persicus, during controlled spawning. Fourteen mature females were divided into two groups: ‘anesthetized’ and ‘non‐anesthetized’. All activities including transportation, catheterizing and handling were performed with both groups: (i) under anesthesia (150 ppm clove oil), and (ii) without anesthesia. After 10 days storage and handling, blood samples were taken from all fish after anesthesia. No significant differences were found in the reproductive performance of either group. However, differences were found in the hematological parameters, with values being significantly higher in the non‐anesthetized group, including neutrophils (34.36 ± 6.33% vs 23.63 ± 5.22%), monocytes (2.84 ± 1.70% vs 1.27 ± 0.64%), mean corpuscular volume (321.3 ± 39.40 pg vs 228.0 ± 24.46 pg) and mean corpuscular hemoglobin (106.9 ± 15.70 fl vs 76.50 ± 7.50 fl). Significantly lower values were found in the non‐anesthetized group for lymphocytes (60.68 ± 7.25% vs 73.54 ± 4.80%), Hb (4.62 ± 0.74 mg dl−1 vs 6.28 ± 1.21 mg dl−1), Hct (13.86 ± 1.76% vs 18.84 ± 3.85%), red blood cell (0.43 ± 0.05 cell mm−3 vs 0.85 ± 0.13 × 106 cell mm−3) and white blood cell (22 403 ± 2240 cell mm−3 vs 35 318 ± 3084 cell mm−3). The non‐anesthetized fish had significantly higher cortisol levels compared to the anesthetized group (62.33 ± 8.85 ng ml−1 vs 46.12 ± 8.07 ng ml−1). There was no difference in plasma glucose levels between groups. It is concluded that the use of clove oil as an anesthetic is suitable for handling of wild female Persian sturgeon in controlled propagation programmes. However, further research is needed to determine a standardized protocol for the safe application of anesthesia for use in sturgeons in general.
      PubDate: 2015-08-26T07:38:11.253698-05:
      DOI: 10.1111/jai.12866
  • Length–weight relationships of two fish species from the upper
           reaches of the Yangtze River, China
    • Authors: H. Wang; J. F. Tang, R. Ruan, F. Wang, W. Xiong
      Abstract: Length–weight relationships were determined for two fish species (Jinshaia sinensis Sauvage & Dabry de Thiersant, 1874; and Zacco platypus Temminck & Schlegel, 1846) collected from the upper reaches of the Yangtze River in China. The length–weight relationships were determined for the first time.
      PubDate: 2015-08-26T07:37:45.817067-05:
      DOI: 10.1111/jai.12876
  • Length–length and length–weight relationships of fish species
           from the Lake Eyre Basin, Australia
    • Authors: D. Sternberg; B. Cockayne
      Abstract: The Lake Eyre Basin in central Australia is one of the world's last unregulated dryland river systems. To facilitate future research in this area, the relationships between total length, standard length, and wet weight for 10 widespread, large‐bodied freshwater fish species are presented. All linear relationships were strong (r2 > 0.90) and values of the exponent b of the length–weight relationships ranged from 2.786 to 3.336. These results provide novel baseline data for species in this area.
      PubDate: 2015-08-25T05:29:31.361148-05:
      DOI: 10.1111/jai.12863
  • Structure of fish assemblages in seven tropical reservoirs in southeastern
           Brazil during the rainy season; what matters: physico‐chemical or
           hydrological connectivity influences'
    • Abstract: Closely connected reservoirs were hypothesized to have more similar fish compositions than do spatially isolated reservoirs, and that environmental variables play an important role in shaping assemblage structure on a local scale. Fish assemblages and environmental variables were sampled in seven reservoirs constructed to generate hydroelectricity, with most inflowing water coming directly or via transposition of the Paraiba do Sul River, in Southeastern Brazil. Using gill nets and environmental measurement variables, fish collections were carried out between January and February 2008 (wet season), when increases in temperature and rainfall increase hydrological connectivity, facilitating fish movements throughout the river‐reservoir system. Mean fish density, biomass and the number of species did not differ significantly among the seven reservoirs. On the other hand, the assemblage structure differed among almost all pairs of reservoirs. Of the reservoirs connected in series, only two (Santana and Vigário) showed a similar assemblage structure, suggesting that hydrological connectivity plays a minor role. Physico‐chemical variables changed among reservoirs and seemed to play an important role in determining the assemblage structure, with higher conductivity (average = 108 μS cm−1) and TDS – total dissolved solid (0.07 g L−1), and low pH (5.8) in the Pereira Passos Reservoir associated with a high number of the Siluriformes Loricariichthys castaneus, and with the opposite conditions in Tocos (conductivity = 27 μS cm−1; TDS = 0.02 g L−1; pH = 7) that were associated with a high number of the carnivorous Characiformes Oligosarcus hepsetus and Hoplias malabaricus. A direct relationship was found between abundance of the catfishes Pimelodus fur and Glanidium albescens and high turbidity (90.4 NTU) and low temperature (25.3°C) and transparency (0.1 m) in the Ilha dos Pombos Reservoir. Moreover, a close relationship was found between high abundance of the cichlid Cichla kelberi and the high temperature and transparency of Lajes (28.3°C; 2.2 m) and Santa Branca (27.1°C; 2.6 m) reservoirs. These findings support the hypothesis that physico‐chemical variables structure fish assemblages in reservoirs, but that hydrological connectivity seems to play a minor role in shaping assemblage structure. However, other unmeasured variables (e.g. physical habitat characteristics and biotic interactions) and other seasons need to be evaluated in further studies.
      PubDate: 2015-08-25T05:26:59.289415-05:
      DOI: 10.1111/jai.12864
  • Using otolith shape and morphometry to identify four Alburnus species
           (A. chalcoides, A. escherichii, A. mossulensis and
           A. tarichi) in Turkish inland waters
    • Abstract: Asteriscus otolith shapes as well as their morphometry and shape contours were investigated in order to identify four allopatric Alburnus species: A. chalcoides (Güldenstädt, 1772) (Ordu), A. escherichii Steindachner, 1897 (Eskişehir), A. mossulensis Heckel, 1843 (Tunceli), and A. tarichi (Güldenstädt, 1814) (Van) in Turkish inland waters. These were compared using the shape indices (form factor, roundness, circularity, ellipticity, rectangularity and aspect ratio), and the morphological characters [otolith weight (OWE), otolith length (OL), otolith width (OW), otolith perimeter (OP), and otolith area (OA)]. The overall canonical discriminant analysis (CDA) classification score was 93.8%, with the lowest score for A. escherichii (82.5%) and the highest for A. chalcoides (100%). The otolith shapes, morphology and shape contours of all sampled fish were a clear species differentiator, thereby demonstrating that the otolith shape is species‐specific. The current study presents for the first time comprehensive variation information on interspecific left‐right asteriscus otoliths in males and females of each Alburnus species: A. chalcoides from Ordu, A. escherichii from Eskişehir, A. mossulensis from Tunceli and A. tarichi from Van, based on a total of 307 individuals. Scanning electron microscopy (SEM) images, shape contours and other otolith characters vary within the same genus; these differences should be investigated not only in other freshwater fish species or genera but also in the same species living in different habitats. In addition, further investigation is required not only with respect to the morphometry, biometry, shape, geometry, and shape contours of the otoliths, but also regarding the genetic methods for robust identification of various sympatric and allopatric fish populations.
      PubDate: 2015-08-25T04:42:01.546444-05:
      DOI: 10.1111/jai.12860
  • Length–weight relationship of 13 fish species from the Ili River,
    • Authors: X. Y. Sui; X. Q. Li, H. Y. Sun, Y. F. Chen
      Abstract: Length‐weight relationships of 13 fish species are presented from samples collected in the Ili River, northwestern China. This study provides the first description of length‐weight relationships for five of the species. Coefficients of determination (r2) were >0.95 for 10 of the species.
      PubDate: 2015-08-04T07:51:03.636448-05:
      DOI: 10.1111/jai.12818
  • Effect of water temperature on egg incubation time and quality of newly
           hatched larvae of northern pike (Esox lucius L., 1758)
    • Authors: V. Bondarenko; B. Drozd, T. Policar
      Abstract: This study examined the effect of temperature on egg incubation, survival of eggs during embryonic development and quality of newly hatched larvae of northern pike (Esox lucius L.) under laboratory conditions. Eggs of similar size (diameter 2.7 ± 0.16 mm and weight 6.11 ± 0.35 mg) from five females were incubated at 3, 6, 10, 14, and 18°C (groups A, B, C, D, and E, respectively). The lowest fertilization (FR) and hatching rates (HR) were observed in larvae incubated in group A, 44.6 ± 3.2% and 18.26 ± 2.25%, respectively. The highest FR and HR were found in group B (FR, 71.3 ± 4.3%; HR, 56.2 ± 3.21%) and C (FR, 65.6 ± 3.1%; HR, 65.5 ± 5.41%). Time of incubation period varied from 38 ± 0.33 days (120 ± 1.03°d) when 5% larvae were hatched to 46 ± 0.42 days (144 ± 1.31°d) when 95% larvae were hatched in group A and 2.5 ± 0.08 days (44.67 ± 1.42°d) when 5% larvae were hatched to 3.42 ± 0.06 days (61.11 ± 1.07°d) when 95% larvae were hatched in group E. Larvae from groups A, D, and E were characterized by the lowest values of variables such as resistance to osmotic stress after 90 min of exposure of saline solution (OS = 54 ± 3–76 ± 3%), frequency of normally developed larvae (FNL = 23.8 ± 4.14–87. 1 ± 2.42%), and yolk sac volume (YsV = 3.41 ± 0.44–3.89 ± 0.45 μl3). The highest quality larvae were recorded in groups B and C: OS = 92 ± 3% and 80 ± 4%, FNL = 89.7 ± 3.62% and 93.8 ± 3.17, YsV = 3.3 ± 0.66 μl3 and 3.04 ± 0.42 μl3). Fertilization and hatching rates and quality of larvae showed optimal temperature for successful egg incubation and production of high quality larvae to be 6 to 10°C. Relationship of ontogenic rate to temperature showed development of the pike embryo to be hypothetically stopped at 3.3°C.
      PubDate: 2015-08-04T07:50:41.586898-05:
      DOI: 10.1111/jai.12851
  • Effect of water temperature on early life history of African
           sharp‐tooth catfish, Clarias gariepinus (Burchell, 1822)
    • Abstract: Early life history of Clarias gariepinus from egg fertilization to full yolk sac resorption was studied at 33 temperatures within the thermal range 17.4–35.6°C. The viable temperature range for embryonic development; temperature at which ontogeny is hypothetically arrested (15.4°C); viable temperature range for larval development; and the number of effective day‐degrees for the embryonic and larval periods were determined. The early life history of C. gariepinus was found to be temperature‐dependent in terms of the onset of key ontogenetic events, developmental rate, survival rate, and size of larvae. The length of the incubation period, hatching period, size of larvae at hatching, time to first intake of exogenous food, and time to full yolk sac resorption with and without exogenous feed supply, were inversely proportional to the temperature within the optimal temperature range. In terms of survival, the zone of thermal tolerance for early life history of C. gariepinus ranged from 18.9 to 33.2°C with the thermal optimum from 22.9 to 30.3°C, typical for thermophilous species. Temperature ranges of 20.6–22.9°C and 30.2–33.2°C were found to be suboptimal. Temperatures below 17.5 and above 35.1°C may be considered lethal during the embryonic period, and those below 18.9 and above 33.2°C are lethal during the larval period.
      PubDate: 2015-07-14T09:46:29.439002-05:
      DOI: 10.1111/jai.12849
  • The role of zooplankton as food in carp pond farming: a review
    • Abstract: This review paper aims to offer a current view on the function of zooplankton as food for common carp, as traditionally its role has been underestimated compared with benthic invertebrates or supplementary feeding. We prove the importance of zooplankton organisms in the life cycle of common carp in fishponds. As in other fish species, carp larvae feed mainly on zooplankton, starting with small organisms (rotifers) and as they grow then shifting to larger organisms, e.g. copepods and cladocerans. As adults they are commonly benthic feeders, concentrating principally on zoobenthos (mainly chironomid larvae); however, zooplankton is also an important part of the diet, depending on food availability and spatial and temporal variation. Zooplankton is high in protein (above 50% of dry matter for some groups) and lipids (approximately 10% of dry matter with a significant proportion of unsaturated fatty acids). Natural food therefore may provide a high nutritional content, compared to other diets. Appropriate management strategies in fishponds can potentially increase the production of zooplankton, e.g. monitoring zooplankton levels and stocking fish at the appropriate moment, control of environmental variables favouring zooplankton development, and utilizing sustainable fish stocking densities.
      PubDate: 2015-07-14T09:00:09.298958-05:
      DOI: 10.1111/jai.12852
  • Changes in water parameters in carp ponds of northern Austrian
           (Waldviertel) over the last 30 years
    • PubDate: 2015-07-14T07:49:38.039621-05:
      DOI: 10.1111/jai.12847
  • Length–weight relationships of six fish species from the Zengqu
           River and the Ouqu River, southwest China
    • Authors: T. B. Zhu; D. G. Yang, Y. Liu, F. Li
      Abstract: This study provides the first report of length–weight relationships (LWRs) for six endemic fish species collected from the Zengqu River and the Ouqu River, two of the tributaries to the upper reaches of the Jinsha River, southwest China. Samples were obtained in May 2013 and September 2013 using various types of fishing gear. A total of 413 specimens belonging to six fish species were analyzed; their LWRs were W = 0.0069L3.086 (r2 = 0.987) for Schizothorax wangchiachii (Fang, 1936), W = 0.0076L3.029 (r2 = 0.980) for Schizothorax dolichonema (Herzenstein, 1889), W = 0.0029L3.315 (r2 = 0.961) for Schizopygopsis malacanthus (Herzenstein, 1891), W = 0.0082L 2.970 (r2 = 0.950) for Ptychobarbus kaznakovi (Nikolsky, 1903), W = 0.0017L3.464 (r2 = 0.957) for Triplophysa stolioczkae (Steindachner, 1866), and W = 0.0037L 3.190 (r2 = 0.956) for Triplophysa orientalis (Herzenstein, 1888). Prior to this study, the LWRs for S. dolichonema, P. kaznakovi and T. orientalis were unknown. In addition, new maximum sizes for four of the species are provided.
      PubDate: 2015-07-07T02:23:28.644231-05:
      DOI: 10.1111/jai.12843
  • Length–weight relationships and reproductive parameters of Amblyceps
           apangi Nath and Dey, 1989 from Nagaland, India
    • Authors: L. N. Humtsoe; S. Bordoloi
      Abstract: The present study describes certain biological parameters of a hill stream catfish, Amblyceps apangi Nath and Dey, 1989 first described from Arunachal Pradesh, India. The distributional range of the fish was later recorded from the states of Manipur and Nagaland. The fish is very rare and this is the first report on certain biological parameters based on collections (140 males, 105 females) from streams in the Doyang watershed, a tributary of the Brahmaputra River. The value of the allometric coefficient (b) indicated close to isometric growth in males (2.989) and negative allometric growth in females (2.945). The relative condition factor was found to be close to 1 in different size groups. Both males and females attained first maturity (M50) in length group 6.0–7.0 cm. Peak values (Male 0.424, Female 1.465) in the gonadosomatic index (GSI) occurred from April to May, indicating one spawning season per year. The overall female to male ratio was 1 : 1.33. Absolute fecundity ranged from 17 to 122 for fishes of total length 6.34–10.3 cm.
      PubDate: 2015-07-07T02:19:30.942929-05:
      DOI: 10.1111/jai.12827
  • Length‐weight relationships of 10 fish species from two tributaries
           of Indus River Basin in Jammu and Kashmir, India
    • Authors: A. Bashir; N. K. Sharma, B. S. Bisht, R. Singh, J. I. Mir
      Abstract: Length‐weight relationships (LWRs) are described for 10 fish species belonging to three families from the Jhelum and Poonch River, tributaries of the Indus river basin in India. LWRs for these species were unknown to FishBase and new maximum lengths are recorded for three species. These results will be useful for fishery research, management and conservation in these tributaries of Jammu and Kashmir.
      PubDate: 2015-07-03T23:51:52.784768-05:
      DOI: 10.1111/jai.12844
  • Processing traits of European catfish (Silurus glanis Linnaeus, 1758) from
           outdoor flow‐through and indoor recycling aquaculture units
    • Abstract: The quality of fish cultured using recycling units may differ from that of fish from outdoor farming units due to a range of deviating environmental determinants. This applies not only to flesh quality but also to morphological (processing) traits. This study evaluates processing yields of sibling fish cultured in two different farming units: (i) an outdoor pond aquaculture system with a flow‐through regime (24.6 ± 0.2°C), and (ii) indoor tanks using a recirculation aquaculture system (RAS; 26.0 ± 1.0°C). Clear differences were observed in the most important processing traits, i.e. skinned trunk and fillet yields, which were both significantly higher (P 
      PubDate: 2015-07-03T23:51:30.261976-05:
      DOI: 10.1111/jai.12848
  • Effects of common carp (Cyprinus carpio Linnaeus, 1758) supplementary
           feeding with modified cereals on pond water quality and nutrient budget
    • Abstract: This 4‐month study (10 May – 6 September 2012) evaluated the effects of supplementary feeding on common carp (Cyprinus carpio Linnaeus, 1758) growth, water quality, natural food availability and nutrient balance under different pond treatment regimes (eight rectangular earthen ponds; 0.03 ha surface area; 3‐year‐old carp). The nitrogen and phosphorus budgets were calculated as the difference between input (food, fish stocked and influent water) and output (effluent water and fish harvested). Three types of supplementary feeds were used: wheat, thermally‐treated wheat, and thermally‐treated and pressed wheat. An additional test group was provided with naturally available forage only and served as a control. The type of supplementary feed did not influence the water quality, with the exception of dissolved oxygen. No significant differences among experimental ponds were observed in zooplankton abundance. The use of modified cereals (especially thermally‐treated and pressed wheat) improved carp growth performance and resulted in lower nutrient concentrations in effluent water via improving their digestibility. Both thermally‐treated and thermally‐treated and pressed cereals improved the balance of phosphorus; hence these diets could be beneficial, not only from the fish production point of view but also as a tool to reduce the deterioration of pond water quality.
      PubDate: 2015-06-30T07:01:19.507286-05:
      DOI: 10.1111/jai.12850
  • Quality and quantity of pikeperch (Sander lucioperca) spermatozoa after
           varying cold water treatments
    • Authors: M. Blecha; J. Kristan, A. Mohagheghi Samarin, M. Rodina, T. Policar
      Abstract: Three groups of seven pond‐cultured pikeperch males, held under controlled conditions of low water temperature and for a varying photoperiod were injected with 500 IU kg−1 human chorionic gonadotropin. Following a latent period of 72 h, sperm was collected. Stripping was on 26 March (Group A), 21 April (Group B), and 13 June (Group C). Spermatozoa was obtained from 85% fish in group B and from 42% of fish in group C. Mean volume of stripped semen for Group A was 0.64 ml, for Group B 1.07 ml, and for Group C 1.80 ml, while the mean concentration of spermatozoa was similar in all groups (15.73 ± 2.68–19.34 ± 3.87 109 ml−1). Group A spermatozoa showed the longest motile period (89.93 ± 10.20 s) and Group B the shortest (55.18 ± 10.46 s). The highest velocity at 15 s post‐activation was recorded in group A (220 ± 22.3 μm s−1) and the lowest in Group B (159 ± 35 μm s−1). Group C showed velocity of 187 μm s−1. The results of our study showed that the length of the cold water period had no influence on spermatozoa quality, but did have an influence on the ability of males to produce sperm.
      PubDate: 2015-06-30T07:00:54.918935-05:
      DOI: 10.1111/jai.12853
  • Contaminants in muscle tissue from paddlefish (Polyodon spathula) and
           hybrid striped bass (Morone chrysops x M. saxatilis) after being raised in
           reclaimed effluent water
    • PubDate: 2015-06-30T07:00:30.774833-05:
      DOI: 10.1111/jai.12854
  • Determination of the best post‐ovulatory stripping time for the
           common carp (Cyprinus carpio Linnaeus, 1758)
    • Authors: A. M. Samarin; D. Gela, D. Bytyutskyy, T. Policar
      Abstract: To determine the best time interval between ovulation and controlled egg stripping in female common carp (Cyprinus carpio), ovulated eggs were retained at 20°C inside the fish body until 12–14 h post‐ovulation (HPO). The eggs of four females were stripped with two‐hour intervals after ovulation for 12–14 HPO and fertilized with mixed milt obtained from three males. Eyeing, hatching and eyed‐egg mortality rates as well as the occurrence of larval malformations and ploidy anomalies were considered as indices to assess egg quality. The results indicated that throughout 4–6 HPO the eyeing and hatching rates remained approximately 90 and 80% of the initial rates, respectively. Although not significantly different (P > 0.05), the viability rates (eyeing and hatching percentages) increased to about 7.5% of the initial rates at 2–4 HPO compared with 0–2 HPO. Thereafter, the eyeing and hatching rates decreased over time linearly and finally dropped to 11 and 2.5% in eggs fertilized at 12–14 HPO, respectively. Eyed‐egg mortality and larval malformation rates did not display any marked increase in eggs fertilized up to four hours after ovulation but thereafter increased significantly; more than 50% of eyed eggs died, and approx. 20% of hatched larvae were malformed at 8–10 HPO. Post‐ovulatory oocyte ageing did not affect the ploidy level of the larvae. Based on the results obtained in this study, common carp egg quality is maintained inside the fish body for at least four HPO. The best post‐ovulatory stripping time was estimated to be within 2–4 HPO and therefore we recommend that the eggs be retained inside the fish body for this period of time after ovulation. The complete loss of egg viability also occurs 12–14 h after ovulation.
      PubDate: 2015-06-30T06:57:30.560303-05:
      DOI: 10.1111/jai.12855
  • Length–weight relationships for six fish species in Iskenderun Bay
           (Eastern Mediterranean Sea coast of Turkey)
    • Authors: D. Erguden; S. A. Erguden, M. Gurlek
      Abstract: The length–weight relationships (LWRs) were estimated for six non‐indigenous fish species, namely, Apogon smithi (Kotthaus, 1970); Ostorhinchus fasciatus (White, 1790); Pomadasys stridens (Forsskål, 1775); Champsodon capensis Regan, 1908; Torquigener flavimaculosus Hardy & Randall, 1983; and Tylerius spinosissimus (Regan, 1908) from Iskenderun Bay, eastern Mediterranean Sea. Their length–weight relationship b values ranged from 2.902 to 3.501, and all regressions were found to be significant for all six species (P 
      PubDate: 2015-06-30T06:39:45.046675-05:
      DOI: 10.1111/jai.12839
  • Length–weight and length–length relationships of four species
           of genus Pethia and genus Puntius from wetlands of Lakhimpur district,
           Assam, India
    • Authors: G. Kaushik; S. Bordoloi
      Abstract: Length–weight relationships (LWR) and length–length relationships (LLR) were estimated for four species, namely, Puntius sophore (Hamilton, 1822), Puntius chola (Hamilton, 1822), Pethia ornatus (Vishwanath & Laisram, 2004) and Pethia ticto (Hamilton, 1822) collected from different wetlands of Lakhimpur, Assam. The values of the parameter slope (b) in the LWR were 3.30 for Puntius sophore, 3.22 for Puntius chola, 2.61 for Pethia ornatus and 3.27 for Pethia ticto. The relationships among TL, FL and SL were all linear (r2 > 0.95).
      PubDate: 2015-06-30T06:39:23.078395-05:
      DOI: 10.1111/jai.12841
  • Weight–length relationships of six batoids in the Ecuadorian Pacific
    • Abstract: Weight–length relationships (WLR) were estimated for six batoids, namely: Urotrygon chilensis, Narcine entemedor, Rhinobatos leucorhynchus, Rhinobatos planiceps, Rhinobatos prahli and Urobatis tumbesensis captured in the Ecuadorian Pacific. Data were collected between October 2013 and August 2014 in two artisanal fishing ports. In addition, this represents the first WLR estimations for five of the species.
      PubDate: 2015-06-24T05:37:21.602512-05:
      DOI: 10.1111/jai.12829
  • Length–weight relationships for two marine fish species from the
           Gulf of Oman: Uranoscopus guttatus Cuvier, 1829 and Lagocephalus inermis
           (Temminck & Schlegel, 1850)
    • Abstract: This study presents the first report of length–weight relationships (LWRs) for Uranoscopus guttatus and Lagocephalus inermis from the Iranian coast on the Gulf of Oman. A wide range of body lengths and weights were obtained using samples from non‐selective trawling surveys. The LWRs obtained were W = 41.408L3.519 and W = 16.525L2.847 for U. guttatus and L. inermis, respectively.
      PubDate: 2015-06-24T05:36:59.034986-05:
      DOI: 10.1111/jai.12821
  • Length‐weight relationships of 18 fish species from the Siluriformes
           order in a hydrographic subtropical basin in southern Brazil
    • Abstract: The present paper describes the length–weight relationship of 18 fish species from the Siluriformes order in a subtropical basin, southern Brazil.
      PubDate: 2015-06-23T02:51:17.494799-05:
      DOI: 10.1111/jai.12822
  • Length–weight relationships of fish from Madeira River, Brazilian
           Amazon, before the construction of hydropower plants
    • Abstract: Length–weight relationships (LWRs) are presented for 112 freshwater fish species representing 23 families and five orders captured in the Madeira River, the largest white‐water river tributary of the Amazon River. The allometry coefficient (b) of the LWR (Wt = aSLb) ranged from 2.446 to 3.856 with a median value of 3.102. Eight new LWR records are presented for Amazonian species as information for FishBase. LWRs in the present study provide historical data on a and b coefficients prior to the damming of the Madeira River in November 2011, allowing comparison estimates of predicted future population parameters as influenced by human intervention.
      PubDate: 2015-06-23T02:50:38.646599-05:
      DOI: 10.1111/jai.12819
  • Length–weight relationships of eight freshwater (Cypriniformes) fish
           species from Turkey
    • Authors: H. Ayyildiz; Y. Emre, A. Yagci, A. Altin
      Abstract: The length–weight relationships for eight freshwater fish species collected from Beyşehir Lake, Eğirdir Lake, Aksu River, Alara River, Göksu River and Menzelet Reservoir, were analysed. This paper represents the first LWR references for four of these species and also four of these species are endemic to Turkey.
      PubDate: 2015-06-23T02:34:50.423091-05:
      DOI: 10.1111/jai.12828
  • Length–weight relationship of two fish species from Poonch River,
           Western Indian Himalaya: Glyptothorax kashmirensis (Hora, 1923) and
           Crossocheilus diplochilus (Heckel, 1838)
    • Authors: N. K. Sharma; R. Singh, N. N. Pandey, M. S. Akhtar, J. I. Mir
      Abstract: This study provides the first report of length–weight relationships (LWRs) for two fish species, Glyptothorax kashmirensis and Crossocheilus diplochilus, collected from the Poonch River, one of the lesser tributaries to the Indus basin in India. New maximum length records are reported for both species.
      PubDate: 2015-06-23T02:33:43.209265-05:
      DOI: 10.1111/jai.12834
  • Length–weight relationships of two cyprinid fish species,
           Crossocheilus latius (Hamilton, 1822) and Garra gotyla gotyla (Gray, 1830)
           from the Ganga River Basin, India
    • Authors: N. K. Sharma; J. I. Mir, A. K. Dobriyal, R. Singh
      Abstract: This study provides length–weight relationship (LWR) information for two fish species (family Cyprinidae), Crossocheilus latius (Hamilton, 1822) and Garra gotyla gotyla (Gray, 1830), from a tributary of the Ganga River Basin, India. Both species had no previous LWR estimates as per Fishbase 2014.
      PubDate: 2015-06-23T02:03:17.034252-05:
      DOI: 10.1111/jai.12835
  • Relationship of otolith length to fish total length in six demersal
           species from the NW Mediterranean Sea
    • Authors: C. Viva; P. Sartor, D. Bertolini, S. De Ranieri, A. Ligas
      Abstract: Relationships between otolith major axis length (mm) and fish size (total length, cm) were described by means of linear regression analysis for six demersal fish species from the NW Mediterranean: blue whiting (Micromesistius poutassou), greater forkbeard (Phycis blennoides), red mullet (Mullus barbatus), poor cod (Trisopetus minutus capelanus), horse mackerel (Trachurus trachurus), and Mediterranean mackerel (Trachurus mediterraneus). Results show that reconstruction of body size from otolith measurement is possible by applying this approach based on the relationship of otolith length – fish length.
      PubDate: 2015-06-23T01:59:57.466906-05:
      DOI: 10.1111/jai.12838
  • Length–weight relationships for eight fish species from the Ravi
           River, north‐western India
    • Authors: N. K. Sharma; J. I. Mir, R. Singh, M. S. Akhtar, N. N. Pandey
      Abstract: Length–weight relationships (LWRs) were evaluated for Badis badis (n = 25), Sperata seenghala (n = 26), Labeo gonius (n = 34), Rasbora rasbora (n = 30), Bagarius bagarius (n = 24), Gagata cenia (n = 27), Glyptothorax stoliczkae (n = 24) and Channa orientalis (n = 28) from the Ravi River tributary in North India. Altogether 218 samples of eight species were obtained between May and November 2014 using cast nets and gill nets. LWRs for these species were unknown to FishBase, and new maximum lengths were recorded for two of these species.
      PubDate: 2015-06-23T01:58:12.510793-05:
      DOI: 10.1111/jai.12836
  • Length–weight relationship of Hyporthodus haifensis and Mycteroperca
           rubra (Pisces; Serranidae) from the North‐Eastern Mediterranean Sea,
    • Abstract: Length–weight relationships (LWRs) for Hyporthodus haifensis and Mycteroperca rubra were studied using longlines at depths of 5–150 m, in the Gulf of Antalya, northeastern Mediterranean Sea. Fishing operations were carried out daily with 15 fishing boats. A total of 170 individuals were sampled. The LWR relationships of Hyporthodus haifensis and Mycteroperca rubra were calculated as W = 0.009L3.142 (r2) = 0.996 and W = 0.0081L3.0652 (r2) = 0.989 P 
      PubDate: 2015-06-23T01:37:44.131595-05:
      DOI: 10.1111/jai.12837
  • Length‐weight relationships of 19 freshwater fishes from the
           Daechung Reservoir in South Korea
    • Abstract: The length‐weight relationships for nineteen freshwater fish species in the Daechung Reservoir, South Korea, were analyzed. LWR data for fourteen of these species were not yet listed in FishBase.
      PubDate: 2015-06-22T05:32:54.402137-05:
      DOI: 10.1111/jai.12767
  • Endocrine changes during the previtellogenic stage of the great sturgeon,
           Huso huso (Linnaeus, 1758)
    • Authors: B. Falahatkar
      Abstract: The study aimed to investigate changes in serum concentrations of sex steroids, thyroid hormones, stress indices, cholesterol, triacylglycerol, calcium and phosphorus, as well as the growth in the 3‐year old previtellogenic stage of great sturgeon, Huso huso over a 6‐month period. Forty individually marked fish (mean weight 6913 g) were divided among three circular tanks under a natural temperature and photoperiod. Every 1.5 months fish were weighed and blood samples taken for serum analysis. Fish showed significant changes in 17β estradiol, testosterone, triiodothyronine (T3), thyroxine (T4), adrenocorticotropic hormone, cortisol, cholesterol, and phosphorus, but not in triacylglycerol and calcium concentrations. From the January onset of the experiment to the end of the trial in July, there was a decrease in sex steroids and cortisol concentrations as well as a decline in T3 concentrations from March and in T4 from February to July. The mean weight of fish increased significantly from the beginning to the end of the experiment. Although the oocyte diameter increased from 197 to 202 μm, the difference was not significant. The histological data on oocytes suggest that the great sturgeon, like the other sturgeons, has a heterogeneous asynchronous ovarian development in the early stage of reproduction. This data might be useful to the further understanding of the physiology of Huso huso and/or to improve its culture. Moreover, it leads to a general increase in the understanding of the basic reproductive biology of this valuable chondrostean species.
      PubDate: 2015-06-20T02:01:46.130265-05:
      DOI: 10.1111/jai.12813
  • Documented predation of pallid sturgeon Scaphirhynchus albus (Forbes &
           Richardson, 1905) by flathead catfish Pylodictis olivaris (Rafinesque,
    • Authors: K. D. Steffensen; S. A. Lundgren, T. W. Huenemann
      PubDate: 2015-06-17T07:16:21.191769-05:
      DOI: 10.1111/jai.12831
  • Length‐weight relationships of eight freshwater fishes from the
           Yangtze River and Lake Taihu, China
    • Authors: S. K. Tang; T. Q. Zhang, J. M. Lu, B. Q. Zhu, D. M. Li
      Abstract: The length‐weight relationships (LWRs) are presented for eight freshwater fish species (Acheilognathus macropterus, Saurogobio dabryi, Saurogobio gymnocheilus, Sinobdella sinensis, Pelteobagrus eupogon, Rhinogobius cliffordpopei, Neosalanx jordani, and Silurus meridionalis) from the Yangtze River and Lake Taihu. A total of 1044 specimens were sampled and measured between July 2012 and June 2014. Among the eight species, five species have no LWR estimates in FishBase.
      PubDate: 2015-06-17T07:15:12.443443-05:
      DOI: 10.1111/jai.12817
  • Ontogenetic changes in RNA, DNA and protein contents of Chinese loach,
           Paramisgurnus dabryanus (Dabry de Thiersant, 1872), larvae and juveniles
    • Abstract: The changes in nucleic acid‐based indices and protein variables of Chinese loach, Paramisgurnus dabryanus, larvae and juveniles from hatching to 60 days after hatching (DAH) were conducted to assess its growth potential. The nucleic acid contents were analysed using a UV‐based method (n = 3, rearing temperature 24.4 ± 0.4°C, dissolve oxygen 7.1 ± 0.5 mg L−1, pH 7.9 ± 0.4). Ribonucleic acid (RNA) concentration significantly decreased from 2 to 5 DAH, then increased rapidly until 10 DAH, declining slightly thereafter. Deoxyribonucleic acid (DNA) concentration increased 2–5 DAH, decreased until 9 DAH, slightly increased again around 26 DAH, and then declined to a relatively stable level. Both RNA‐DNA and protein‐DNA ratios showed a statistically obvious relationship with growth rates. A significantly positive relationship was found between RNA‐DNA ratio and growth rates during the early life stage of Chinese loach. According to the results, growth of Chinese loach is characterized by rapid hyperplasia from hatching through completion of the yolk‐sac stage followed by continued rapid hyperplasia combined with increasing hypertrophy after feeding commences. The stage preceding 17 DAH of Chinese loach P. dabryanus is presumed to be critical for its survival and growth at 24°C.
      PubDate: 2015-06-17T07:14:12.872678-05:
      DOI: 10.1111/jai.12808
  • Diet of two commercially important shark species in the United Arab
           Emirates: milk shark, Rhizoprionodon acutus (Rüppell, 1837), and
    • Authors: R. W. Jabado; S. M. Al Ghais, W. Hamza, A. C. Henderson, A. A. Al Mesafri
      Abstract: The diets of the milk shark, Rhizoprionodon acutus, and the slit‐eye shark, Loxodon macrorhinus, landed from the artisanal fishery in the Arabian Gulf waters of the United Arab Emirates were investigated to determine their dietary preferences. Stomach contents from 57 milk sharks and 53 slit eye sharks were collected from Abu Dhabi (R. acutus, n = 23), Dubai (R. acutus, n = 5; L. macrorhinus, n = 15) and Ras Al Khaimah (R. acutus, n = 29; L. macrorhinus, n = 38) during fishery surveys from January to May 2012. Prey items were identified to the lowest possible taxonomic level, grouped into five categories including ‘teleost fish’, ‘cephalopods’, ‘crustaceans’, ‘invertebrates’, and ‘other’. The diets of both species were described using the numeric, frequency and weight methods, and the index of relative importance (IRI). The majority of stomachs for both species had food, with 66.6% of milk shark stomachs and 90.5% of slit‐eye shark stomachs containing prey items, both dominated by small teleosts. Rhizoprionodon acutus fed on a wide variety of teleost species, primarily Engraulidae (anchovies) (28%), Gerreidae (mojarras) (5.6%) and Carangidae (jacks) (1.6%) with occasional crustacean and cephalopod prey (8%). On the other hand, L. macrorhinus seemed to have a preference for one species in terms of teleosts (anchovies) (35.1%) and fed on a wider variety of crustaceans and cephalopods (22.6%). There was little overlap in the diets of these two species, suggesting that they may either be using different habitats or that in these waters, the milk shark is a generalist species while the slit‐eye is a specialist feeder.
      PubDate: 2015-06-17T07:13:51.019377-05:
      DOI: 10.1111/jai.12805
  • Evaluation of safflower meal as a protein source in diets of rainbow trout
           [Oncorhynchus mykiss, Walbaum, 1792)]*
    • Authors: S. Ustaoglu Tiril; M. Kerim
      Abstract: The effects of different levels of safflower meal (a residue of the plant oil extraction process) in diets of rainbow trout (Oncorhynchus mykiss) on growth performance, nutrient digestibility and body composition were investigated. Four different diets containing 0% (Control group), 10% (Diet 1), 15% (Diet 2) and 20% (Diet 3) safflower meal were formulated for the fish with a mean weight of 132.70 ± 0.75 g fed for 70 days. At the end of the experiment, there were no significant differences among dietary treatments for weight gain, specific growth rate and feed conversion ratio (P > 0.05). There were also no differences in the digestibility of crude protein and crude lipid between groups (P > 0.05). Supplementation of safflower meal in the diets also had no adverse effects on body composition. The results indicate that safflower meal is a promising feed ingredient and can be used up to a concentration of 20% in the rainbow trout diet with no adverse effects on growth performance, nutrient digestibility or body composition.
      PubDate: 2015-06-17T07:13:06.788489-05:
      DOI: 10.1111/jai.12807
  • Effect of avermectin (AVM) on the expression of γ‐aminobutyric
           acid A receptor (GABAAR) in Carassius gibelio (Bloch, 1782)
    • Authors: A. L. Zhou; K. Hu, J. M. Ruan, H. P. Cao, Y. Wang, Y. N. Zhao, X. L. Yang
      Abstract: This study describes the effect of avermectin (AVM) on the expression of γ‐aminobutyric acid A receptor (GABAAR) in Carassius gibelio. To assess the specific expression of GABAAR in the brain, gonads, liver, kidneys, heart, muscles, and skin of C. gibelio, the expression of GABAAR α1 subunit (GABAARα1) was measured by Western blotting. To study the effects of AVM on the expression of GABAAR, the median lethal concentration (LC50) at 24, 48, and 96 h of AVM was determined and the expression of GABAAR in the brain, liver, and kidneys of the corresponding C. gibelio evaluated by Western blotting and immunohistochemistry. The results show that GABAAR was expressed in the brain, gonads, liver, kidneys, heart, intestines, muscles, and skin, while primarily distributed in the central nervous system and moderately distributed in peripheral tissues. The expression of GABAAR in the brain, liver, and kidney tissues of C. gibelio was increased with the treatment of AVM at 24 h LC50, but attenuated by the treatment of AVM at 48 h LC50 and 96 h LC50. This suggests a threshold effect of AVM.
      PubDate: 2015-06-17T06:51:57.80356-05:0
      DOI: 10.1111/jai.12794
  • Development and characterization of 21 novel microsatellite markers for
           the Amur catfish (Silurus asotus Linnaeus, 1758)
    • Authors: M. Xie; F. Shao, Y. Zhang, Z. Peng
      PubDate: 2015-06-11T02:31:14.441209-05:
      DOI: 10.1111/jai.12815
  • Age estimations of wild pallid sturgeon (Scaphirhynchus albus, Forbes
           & Richardson 1905) based on pectoral fin spines, otoliths and bomb
           radiocarbon: inferences on recruitment in the dam‐fragmented
           Missouri River
    • Authors: P. J. Braaten; S. E. Campana, D. B. Fuller, R. D. Lott, R. M. Bruch, G. R. Jordan
      First page: 821
      Abstract: An extant stock of wild pallid sturgeon Scaphirhynchus albus persists in the fragmented upper Missouri River basin of Montana and North Dakota. Although successful spawning and hatch of embryos has been verified, long‐term catch records suggest that recruitment has not occurred for several decades as the extant stock lacks juvenile size classes and is comprised exclusively of large, presumably old individuals. Ages of 11 deceased (death years 1997–2007) wild S. albus (136–166 cm fork length) were estimated based on pectoral fin spines, sagittal otoliths and bomb radiocarbon (14C) assays of otoliths to test the hypothesis that members of this stock are old and to provide inferences on recruitment years that produced the extant stock. Age estimations based on counts of presumed annuli were about 2 years greater for otoliths (mean = 51 years, range = 43–57 years) than spines (mean = 49 years, range = 37–59 years). Based on 14C assays, confirmed birth years for all individuals occurred prior to 1957, thus establishing known longevity of at least 50 years. Estimated age based on presumed otolith annuli for one S. albus was validated to at least age 49. Although 14C assays confirmed pre‐1957 birth years for all S. albus, only 56% of estimated ages from spines and 91% of estimated ages from otoliths depicted pre‐1957 birth years. Both ageing structures were subject to under‐ageing error (up to 15 years). Lack of or severe curtailment of S. albus recruitment in the upper Missouri River basin since the mid‐1950s closely parallels the 1953–1957 timeframe when a mainstem reservoir was constructed and started to fill. This reservoir may function as a system‐wide stressor to diminish recruitment success of S. albus in the upper Missouri River basin.
      PubDate: 2015-09-08T00:46:34.107206-05:
      DOI: 10.1111/jai.12873
  • Drastic decline in spawning activity of Chinese sturgeon Acipenser
           sinensis Gray 1835 in the remaining spawning ground of the Yangtze River
           since the construction of hydrodams
    • Authors: J. M. Wu; C. Y. Wang, H. Zhang, H. Du, Z. G. Liu, L. Shen, Q. W. Wei, H. Rosenthal
      First page: 839
      PubDate: 2015-09-08T00:46:35.549979-05:
      DOI: 10.1111/jai.12882
  • Spawning activity of the four major Chinese carps in the middle mainstream
           of the Yangtze River, during the Three Gorges Reservoir operation period,
    • First page: 846
      Abstract: River flow alterations caused by dams have introduced many ecological problems, in particular a decline in aquatic species such as fishes. One compensatory measure is to create a hydrological process similar to the natural state with regard to the survival requirements of the fish. In recent years, the Three Gorges Reservoir (TGR) has introduced man‐made flood by ecological operation experiments to facilitate spawning of the four major Chinese carps in the Yangtze River, China. To investigate the fish spawning activities and their responses to the TGR operation, eggs from the four major Chinese carps were sampled using conical drift nets in the middle mainstream of the Yangtze River, May to July in 2012 and 2013. Spawning timing, location, and scale of the four carps were studied and compared between the 2 years; key hydrological and environmental factors associated with spawning were determined by principal component analysis and stepwise regression analysis. Two factors were significantly positive when correlated with egg abundance: one was increasing rate of the river flow (flood amplitude), and the other was river transparency; only one factor, starting of the river flow (flooding occasions), was significantly and negatively correlated with the time of spawning. Comparison of egg abundance in one flood pulse response to different operation rules showed that flooding made by an ecological operation induced a larger scale of spawning than a conventional operation. The study implied that suitable flood conditions could produce a successful spawning event, and that the occasion and pattern of the flood process might result in different responses in fish spawning. Further research is required to develop more scientific monitoring designs in order to obtain accurate field data for both biotic and abiotic factors, and explore new research methods for egg abundance estimations combined with particle experiment and hydrodynamic modeling. This work is fundamental to improve the strategic decisions on reservoir operation and river management.
      PubDate: 2015-07-16T01:56:35.174605-05:
      DOI: 10.1111/jai.12771
  • The effect of mycotoxin deoxynivalenol (DON) on the oxidative stress
           markers in rainbow trout (Oncorhynchus mykiss, Walbaum 1792)
    • First page: 855
      Abstract: Deoxynivalenol (DON) is one of the most frequently detected mycotoxins in agricultural commodities used as animal feedstuff in Central Europe. This study focuses on determining effects of diets containing DON on oxidative stress markers and detoxifying enzymes in rainbow trout (Oncorhynchus mykiss). The fish were fed with commercial pellets containing DON at a concentration of 2 mg kg−1. Selected enzymes were measured in liver, gill and caudal kidney of the fish after 23 and 32 days of the experiment. Significant differences between the control and experimental groups were observed concerning activities of glutathione peroxidase (GPx) in kidney, glutathione reductase (GR) in gill and kidney, catalase (CAT) in kidney and liver and glutathione S‐transferase (GST) in gill and liver. No significant differences were found for superoxide dismutase (SOD) gene expression, lipid peroxidation (TBARS) and the ferric reducing ability of plasma (FRAP). The data show that DON in the diet at the concentration below EC recommendation (2006/576/EC) induces oxidative stress in the rainbow trout.
      PubDate: 2015-07-16T02:06:13.975469-05:
      DOI: 10.1111/jai.12809
  • Correlations between body length and otolith size in smallmouth bass
           Micropterus dolomieu Lacépède, 1802 with implications for
           retrospective growth analyses
    • Authors: R. Humston; M. Moore, C. Wass, D. Dennis, S. Doss
      First page: 883
      Abstract: Reconstructing individual growth history from analysis of increments in otoliths, scales, or spines can provide information on past growth responses to environmental variation, which in turn can be useful for predicting population‐level response to climate change. The objective of this study was to examine correlations between body length and different metrics of otolith size for Micropterus dolomieu. Three metrics corresponding to commonly‐used microstructural and ultrastructural otolith dimensions were measured using image analysis of digital micrographs from a sample of 214 M. dolomieu ranging from 115 to 438 mm total length collected in 2011–2013. It was found that anteroposterior length of whole otoliths provided much improved regression relationships with body size as well as ease of data collection and faster sampling throughput compared with microstructural measures from polished sections. When applying these metrics to reconstruct growth history the biological intercept model generally produced more reasonable back‐calculated estimates of length‐at‐age, although this was not consistent across all otolith metrics. Results suggest that whole otolith measures should be employed due to efficiency of data collection and greater reliability for reconstructing growth history in M. dolomieu.
      PubDate: 2015-05-25T02:25:48.565287-05:
      DOI: 10.1111/jai.12801
  • Distribution, abundance and condition of invasive Ponto‐Caspian
           gobies Ponticola kessleri (Günther, 1861), Neogobius fluviatilis
           (Pallas, 1814), and Neogobius melanostomus (Pallas, 1814) in the Sava
           River basin, Croatia
    • First page: 888
      Abstract: Distributions, population densities, invasive potentials and adverse impacts of invasive Ponto‐Caspian gobies on native fauna in the Sava River basin remain unknown, whereby 23 locations in the Sava basin were sampled during a three‐year period (2011–2013). Among the five Ponto‐Caspian goby species previously reported in Croatia, only Neogobius fluviatilis (291), Neogobius melanostomus (177) and Ponticola kessleri (21) specimens were collected. Proterorhinus semilunaris and Babka gymnotrachelus were not found. N. fluviatilis was dominant among the invasive gobies at the majority of locations and almost omnipresent (apart from the upper Sava reaches) in the Sava basin. N. melanostomus was found only in the navigable Sava reaches, but its distribution range still seems to be expanding. The status of P. kessleri invasion remains unclear, as it was only found in 2011 at three locations in the lower Sava reaches. No significant (P > 0.05) increase in average catch‐per‐unit‐effort (CPUE) values was observed during the three‐year period. There is some evidence that a decline in Gobio gobio populations might be expected in response to increasing N. fluviatilis population densities. The findings suggest that further range expansions by the Ponto‐Caspian gobies can be expected in Croatia and the implementation of measures to limit their spreading should be considered.
      PubDate: 2015-06-11T02:17:33.18787-05:0
      DOI: 10.1111/jai.12803
  • Ionregulation in juvenile swordspine snook (Centropomus ensiferus, Poey,
           1860) in relation to environmental salinity
    • First page: 900
      Abstract: Ninety‐nine swordspine snook Centropomus ensiferus (9.80 ± 0.3 g, mean ± SE) were studied in order to evaluate the influence of salinity on physiological properties under rearing conditions. Growth performance, survival rates, and ion concentrations (Na+, K+, Cl−) as well proximal composition were measured over 76 days. Fish were exposed to three experimental salinities (0, 10, 20‰, three replicates per treatment) and maintained in plastic tanks with a recirculation system equipped with flow‐through aquaria pumps (533 L per tank). Fish were fed twice daily to apparent satiation; at the end of the experiment the weight of fish kept in 10‰ was higher than that of fish kept in 0 and 20‰, however no significant differences (P > 0.05) were observed among the experimental salinities. Survival was significantly lower in 10‰ salinity than in fish kept in 20 and 0‰ salinities. No significant differences (P > 0.05) were found in the Condition factor (K), specific growth rate (SGR), or in plasma Na+, K+, or Cl− concentrations among treatments. Salinities also did not affect body composition (P > 0.05), but were significantly lower (P  4%) was observed. Water quality was within the optimum range (T: 28.7 ± 0.1°C; O2: 5.6 ± 0.1 mg L−1; ammonia: 0.2 mg L−1) for the growth of swordspine snook. Data indicates that C. ensiferus is an ionoregulator fish and able to cultivate successfully in various osmotic conditions, and in turn, maintain high levels of survival in captivity.
      PubDate: 2015-05-27T01:32:50.281209-05:
      DOI: 10.1111/jai.12796
  • Factors influencing three‐spined stickleback
           Gasterosteus aculeatus (Linnaeus 1758) catch per unit effort
    • First page: 905
      Abstract: Different types of fishing gear are known to vary in catch per unit effort (CPUE), but little is known regarding this in respect to the three‐spined stickleback Gasterosteus aculeatus (Linnaeus 1758). The influence of the three‐spined stickleback CPUE by trap model, baiting and visual attractors was investigated. One trap type was found to out‐perform the other; however, baiting or attractors did not influence the CPUE. Hence, the results suggest that while the choice of trap type may have an impact on the three‐spined stickleback CPUE, baiting or attractors do not seem to improve the impact.
      PubDate: 2015-06-11T02:26:40.784256-05:
      DOI: 10.1111/jai.12810
  • Radiocesium concentrations and body size of largemouth bass, Micropterus
           salmoides (Lacépède, 1802), and smallmouth bass,
           M. dolomieu Lacépède, 1802, in Lake Hayama, Japan
    • Authors: K. Takagi; S. Yamamoto, K. Matsuda, A. Tomiya, M. Enomoto, Y. Shigenobu, K. Fujimoto, T. Ono, T. Morita, K. Uchida, T. Watanabe
      First page: 909
      PubDate: 2015-06-30T07:07:08.600045-05:
      DOI: 10.1111/jai.12846
  • Isolation and characterization of 15 novel microsatellite loci from an
           endangered bream Megalobrama pellegrini (Tchang, 1930)
    • Authors: W. Luo; K. Zhao, Y. Zhang, Z. Peng
      First page: 912
      PubDate: 2015-06-03T02:01:29.417651-05:
      DOI: 10.1111/jai.12816
  • Isolation and characterization of sixteen microsatellite loci for the
           rudderfish Kyphosus elegans (Centrarchiformes: Kyphosidae) from Easter
           Island, discovered with Next Generation Sequencing
    • First page: 915
      PubDate: 2015-06-11T02:26:20.06234-05:0
      DOI: 10.1111/jai.12812
  • Additional record of the yellowmouth barracuda, Sphyraena viridensis
           Cuvier, 1829 (Perciformes: Sphyraenidae) from the NE Aegean Sea (Izmir
           Bay, Turkey)
    • Authors: O. Akyol
      First page: 919
      PubDate: 2015-06-30T06:35:37.392834-05:
      DOI: 10.1111/jai.12832
  • Records of Stomias boa boa (Risso, 1810) and Nemichthys scolopaceus
           Richardson, 1848 from Mersin Bay, Turkey
    • Authors: Y. K. Bayhan; D. Erguden, A. Altun
      First page: 922
      PubDate: 2015-07-14T07:49:39.207209-05:
      DOI: 10.1111/jai.12845
  • High frequency of deformations in Dolly Varden charr (Salvelinus malma,
           Walbaum, 1792), an introduced population
    • Authors: G. Sahashi
      First page: 924
      PubDate: 2015-07-03T23:53:30.978356-05:
      DOI: 10.1111/jai.12842
  • A survey of epitheliocystis disease in farmed Nile tilapia (Oreochromis
           niloticus Linnaeus, 1758) in Brazil
    • First page: 927
      PubDate: 2015-07-14T08:59:00.588835-05:
      DOI: 10.1111/jai.12840
  • Characterization of hematological parameters and blood cells of cultured
           Gymnocypris eckloni Herzenstein, 1891
    • First page: 931
      Abstract: The objective of the study was to obtain baseline data on haematological parameters, blood cell sizes and morphology in cultured male and female Gymnocypris eckloni Herzenstein, 1891. Forty‐eight healthy 3‐year‐old G. eckloni (26 males: 525.79 ± 48.56 g weight, 34.51 ± 1.88 cm total length; 22 females: 507.60 ± 54.48 g weight, 33.97 ± 1.84 cm total length) were used for this study. Both male and female gonadal maturity were at stage III (maturing). The fish were reared in 25–36 m2 outdoor tanks at dissolved oxygen 6.86 ± 0.48 mg L−1, pH 7.22 ± 0.58, temperature 12.40 ± 0.94°C and stocking density 50–80 fish m−3 during November 2014. The fish were fed commercial carp floating foods containing 35% crude protein three times daily. Haematological values were performed manually on heparin anticoagulated blood specimens using standard methods. The morphological features of blood cells and differential cell counts were done on Wright–Giemsa stained blood smears with no anticoagulants. Erythrocytes, leucocytes (neutrophils, eosinophils, lymphocytes and monocytes) and thrombocytes were distinguished and characterized under light microscope. The percentage of the different leukocytes revealed predominance of small lymphocytes (male: 62.31 ± 2.06%; female: 63.00 ± 2.25%) and nurophiles (male: 23.85 ± 1.51%; female: 23.49 ± 1.67%) followed by fewer monocytes (male: 4.81 ± 0.68%; female: 4.80 ± 0.77%) and few eosinophils (male: 3.73 ± 0.82%; female: 3.52 ± 0.67%). The nurophile percentages of each stage showed that metamyelocyte accounted for the most (male: 13.29 ± 0.88%; female: 13.07 ± 0.98%), followed by banded ones (male: 7.18 ± 0.49%; female: 7.00 ± 0.58%). The microstructure of G. eckloni blood cells was similar to that of other fish. Sex‐dependent differences for the erythrocyte counts, haemoglobin, haematocrit and mean corpuscular haemoglobin were found (P 
      PubDate: 2015-06-03T01:53:16.643648-05:
      DOI: 10.1111/jai.12798
  • Length‐weight relationships of 19 fish species from the Saemangeum
           Reservoir in South Korea
    • First page: 951
      Abstract: The length‐weight relationships were analysed for 19 species classified into nine families from the Saemangeum reservoir, South Korea. The sample size ranged from 12 individuals for Silurus asotus and Micropterus salmoides to 548 for Liza haematocheila. Six species have no length‐weight information in FishBase.
      PubDate: 2015-06-30T06:22:48.582366-05:
      DOI: 10.1111/jai.12825
  • Length–weight relationships of nine fish species from the streams of
           Hunan Zhangjiajie Chinese Giant Salamander National Natural Reserve, China
    • Authors: Z. Q. Liang; C. R. Wang, Y. A. Wu, L. H. Wen, Q. W. Wei, X. P. Yuan, H. Li, F. C. Liao, L. Li
      First page: 954
      Abstract: Length–weight relationships (LWR), W = aLb, were estimated for nine fish species belonging to three orders, four families and nine genera from the Hunan Zhangjiajie Chinese Giant Salamander National Natural Reserve, in the northwestern part of Hunan Province of central China. Six of the species are endemic to China, of which three are also endemic to the Yangtze River. The r2 value ranged from 0.9546 to 0.9924. Values of b varied from 2.9177 to 3.6752. This study represents the first reference on LWR for nine species, and are new maximum length records for six species.
      PubDate: 2015-06-30T06:37:12.801293-05:
      DOI: 10.1111/jai.12826
  • Length–weight relationships for six fish species from the middle of
           the Yalu Tsangpo River, China
    • Authors: T. B. Huo; L. Li, J. L. Wang, J. S. Zhou, C. Zhang, J. H. Gong, B. Ma
      First page: 956
      Abstract: This paper reports the length–weight relationships for six fish species belonging to the Cyprinidae from the middle of the Yalu Tsangpo River in China. Samples were obtained by electroshock and drift net fishing techniques (mesh size 2 cm × 3 cm; 200 m net length) in April and September to October 2014. Length–weight relationships estimates for these species were not available in FishBase. A total of 737 specimens were used to estimate the a and b parameters. New maximum total lengths are also reported for six species. The r2 values range from 0.98 to 0.99. Values of b vary from 2.88 to 3.19.
      PubDate: 2015-07-30T04:21:59.109746-05:
      DOI: 10.1111/jai.12830
  • Length–weight and length–length relationships of four endemic
           fish species from the upper Yellow River in the Tibetan Plateau, China
    • Authors: J. Y. Xie
      First page: 958
      Abstract: Length–weight (LWRs) and length–length relationships (LLRs) were estimated for four important endemic fish species representating two genera and one family from the upper Yellow River in the Tibetan Plateau, China. Three of the species are endemic to the Tibetan Plateau, and the fourth is endemic to the Yellow River. The b values of all species were within expected ranges, varying between 2.54 and 3.33. The LLRs were highly correlated. The data of the four species represent the first description of their length–weight and length–length relationships.
      PubDate: 2015-07-14T09:46:30.638665-05:
      DOI: 10.1111/jai.12820
  • Length–weight relationships for five endemic fish species in the
           upper Yangtze River basin, China
    • Authors: L. Li; H. Du, L. Ren, J.M. Wu, Q.W. Wei
      First page: 961
      Abstract: Length–weight relationships were estimated for five endemic fish species in the upper Yangtze River: Platysmacheilus nudiventris Luo, Le & Chen, 1977, Xenophysogobio nudicorpa (Huang & Zhang, 1986), Homatula potanini (Günther, 1896), Leptobotia rubrilabris (Dabry de Thiersant, 1872), and Euchiloglanis kishinouyei Kimura, 1934. The a values ranged from 0.0079 to 0.0134, and b values from 2.833 to 3.081. These five endemic species are rare, small and difficult to find and capture. Thus the sampling period was lengthy, from May 2010 to May 2014. A total of 718 specimens were available for analysis, and the length–weight relationships are the first reports for these five endemic fish species.
      PubDate: 2015-07-14T08:58:53.779817-05:
      DOI: 10.1111/jai.12824
  • Length‐weight relationships of nine fish species from the Tetulia
           River, southern Bangladesh
    • Authors: M. Y. Hossain; S. R. M. Sayed, M. Mosaddequr Rahman, M. M. Ali, M. A. Hossen, A. M. Elgorban, Z. F. Ahmed, J. Ohtomi
      First page: 967
      Abstract: The present study describes the length‐weight relationships (LWRs) for nine fish species from the Tetulia River, southern Bangladesh, namely Anabas testudineus, Coilia dussumieri, Otolithoides biauritus, Otolithoides pama, Pethia conchonius, Polynemus paradiseus, Puntius lateristriga, Setipinna taty and Sillaginopsis panijus. A total of 1380 specimens were caught using traditional fishing gear from March 2012 to February 2013. Individual total length (TL) and body weight (BW) were measured by digital slide calipers and digital balance, respectively. The LWR was calculated as W= a Lb, where the W is the BW in g and L the TL in cm, a and b are regression parameters. This study presents the very first references on LWRs for seven of the species. The results are valuable for the application of sustainable management and conservation of these fishes in the Tetulia River and surrounding ecosystems.
      PubDate: 2015-07-14T08:58:52.318264-05:
      DOI: 10.1111/jai.12823
  • Length‐weight relationships of 14 fish species from a lowland
           tropical reservoir in southeastern Brazil
    • First page: 970
      Abstract: The present work reports the length‐weight relationships of 14 abundant fish species from a tropical reservoir (Juturnaiba Reservoir), which is the water supply for several municipalities in the northern Rio de Janeiro State, southeastern Brazil. Fishes were collected quarterly in 2006 and 2007 using gillnets of different mesh sizes (15–120 mm stretched mesh) that were set up at sunset and retrieved the following morning, remaining for ca. 15 h. Of the 14 species, eight had no records in the FishBase LWR database; new maximum lengths are given for eight species.
      PubDate: 2015-07-07T02:24:41.279567-05:
      DOI: 10.1111/jai.12833
  • Erratum
    • First page: 975
      PubDate: 2015-09-08T00:46:27.62331-05:0
      DOI: 10.1111/jai.12858
  • Corrigendum
    • First page: 976
      PubDate: 2015-09-08T00:46:26.518269-05:
      DOI: 10.1111/jai.12859
  • A checklist of the protozoan and metazoan parasites of European eel
           (Anguilla anguilla): checklist of Anguilla anguilla parasites
    • Authors: E. Jakob; T. Walter, R. Hanel
      Abstract: A comprehensive literature review on prevalence and distribution of parasites of the European eel (Anguilla anguilla) in European waters was conducted to set a baseline for future trend analyses and biodiversity considerations. The resulting checklist compiled from peer reviewed journals as well as grey literature including scientific reports, conference contributions, PhD theses and own survey data includes all protozoan and metazoan parasites of the European eel from freshwater, brackish and marine habitats. Parasites are arranged according to phylum and family. Species within families are listed alphabetically. Infected host organs, recorded habitats, localities, countries and literature citations are provided for each species. A total of 161 parasite species/taxa from 30 countries are listed. With the trypanorhynch cestode Tentacularia coryphaenae a new host record could be documented. Furthermore, three new locality records of parasitic nematodes could be added based on own survey data: Anisakis simplex from an eel caught in the Baltic Sea, Eustrongylides mergorum for German freshwaters, and Goezia anguillae from the Tagus estuary in Portugal. Special consideration was given to the distribution of the swimbladder nematode Anguillcoloides (Anguillicola) crassus. A map and table of first reported records of this neozoan parasite species for 25 countries as well as a survey map indicating all published localities documented in the checklist are provided.
      PubDate: 2009-11-25T00:00:00-05:00
      DOI: 10.1111/j.1439-0426.2009.01345.x
  • The origin and divergence of Gobioninae fishes (Teleostei: Cyprinidae)
           based on complete mitochondrial genome sequences
    • Abstract: The gudgeons (subfamily Gobioninae) are a group of cyprinid fishes primarily distributed in East Asia. However, studies on their origins and divergence are scarce. Here the whole mitochondrial genome sequences of 27 gudgeon species (including one newly determined), 22 other cyprinid species, and two non‐cyprinids as outgroups are applied to infer the evolution of the gudgeons. Based on Bayesian and maximum likelihood phylogenetic analyses, the gudgeons were determined to be a monophyletic group which can be further subdivided into four monophyletic clades with strong supports. The divergence times of the gudgeons were estimated using a relaxed molecular clock method; the results indicate that these fishes originated in the early Paleocene (approx. 63.5 Mya) and that the basal Hemibarbus group diverged from the other gudgeon fishes (approx. 58.3 Mya). As an independent group the Coreius began to diverge from the remaining two groups (approx. 54.6 Mya); the most derived two groups diverged from each other (approx. 53.6 Mya). The divergences of the four gudgeon groups were within a relatively short time frame (approx. 58–53 Mya). Based on the reconstruction of evolutionary trends of gudgeon habitat, evidence is provided that supports the origin and differentiation of this fauna as being associated with some special paleo‐environmental events occurring from the early Paleocene to the Pliocene. The study represents comprehensive molecular dating and character evolution analyses of the gudgeons, and providing a valuable framework for future research in the evolution of the Gobioninae fishes.
  • Ultrastructure of grey mullet (Mugil cephalus, Linnaeus, 1758) spermatozoa
           as revealed from light, scanning and transmission electron microscopy
    • Abstract: Spermatozoa morphology and fine structure were studied in the grey mullet, Mugil cephalus using light, scanning and transmission electron microscopy. Light microscopy observations indicate a semi‐cystic type of spermatogenesis in the testis. The electron microscopy micrograph showed that the spermatozoon of M. cephalus is uniflagellated (total length 5.78 ± 1.26 μm), differentiated into an ovoid‐shaped head without acrosome (1.80 ± 0.35 μm in length and 1.91 ± 0.30 μm in diameter), with a short midpiece and a long cylindrical flagellar tail (length 3.60 ± 0.50 μm). The midpiece is characterized by the presence of four to five vacuoles, a cytoplasmic canal, two centriole and two spherical mitochondria having a flat type of cristae. Chromatin granules of the nucleus form an electron‐dense homogeneous mass. The flagellum consists of nine peripheral microtubules and a central pair (9 + 2) surrounded by the plasma membrane with side fins. The results confirm that spermatozoa of M. cephalus are perciform or teleostean type II. Information generated from the present study will be useful in taxonomic classification, cryopreservation and breeding work.
  • Confirmation of induced hybrid from female ship sturgeon (Acipenser
           nudiventris Lovetsky, 1828) and male Siberian sturgeon (Acipenser baerii,
           Brandt, 1869) using microsatellite markers
  • Length‐weight relationships for six freshwater fish species from the
           Seyhan Reservoir (south‐eastern Anatolia, Turkey)
    • Abstract: Length–weight relationships (LWRs) were evaluated for six freshwater species from the Seyhan Reservoir (south‐eastern Anatolia, Turkey): Alburnus orontis, Capoeta angorae, Capoeta erhani, Garra rufa, Luciobarbus pectoralis and Salaria fluviatilis. A total of 525 specimens were captured from five locations using gill nets, scoop nets, and trammel nets of various mesh sizes in November 2012, March 2013 and September 2013. Regressions of all species were found to be significant. These are the first LWR reports for these species from the Seyhan River basin, and the first LWR reports for three of these species (Alburnus orontis, Garra rufa, Luciobarbus pectoralis) from inland waters of Turkey.
  • Otolith microstructure reveals consequences for juvenile growth of
           fractional spawning in an invasive goldfish Carassius auratus (Linnaeus,
           1758) population
    • Abstract: The consequences of fractional spawning on the early‐life growth rates of invasive goldfish (Carassius auratus) from the Qinghai‐Tibet Plateau were studied using the otolith microstructure of samples collected in June 2011. The effect of the estimated hatching date on the subsequent growth of individual fish was determined by back‐calculating their number of growth days, daily growth rates and the onset of their second growth season. The number of growth days in the first growth season ranged from 93 to 186 days. Following hatching, daily growth rates increased rapidly to a maximum of 0.55 mm days−1 before declining to 0.09 mm days−1. The effect of the duration of the first growth season on individuals was significant (P 
  • Dietary valine requirement of juvenile blunt snout bream (Megalobrama
           amblycephala Yih, 1955)
    • Abstract: An 8‐week feeding trial was carried out to test the hypothesis that adequate dietary valine might improve growth, feed utilization and protein content in blunt snout bream, whereas a valine deficiency might have adverse effects on these parameters. Six isonitrogenous (34% crude protein) and isoenergetic (14.2 MJ kg−1 digestible energy) experimental diets were formulated to contain graded valine levels (0.66, 0.95, 1.26, 1.55, 1.87 and 2.16% of dry weight) at about 0.30% increments replaced by equal proportions of glycine. At the end of the experiment the survival rate was not significantly affected by the dietary valine level. Final weight, weight gain (WG), specific growth rate (SGR), feed efficiency ratio (FER) and protein efficiency ratio (PER) increased with an increasing dietary valine level up to the 1.26% diet, and thereafter remained relatively constant. Dietary valine levels significantly affected the viscerosomatic index, but not the hepatosomatic index or condition factor. The dietary valine levels significantly affected the protein contents of whole body and plasma. Dietary valine supplementation significantly increased the plasma valine concentration, but not the levels of other branched‐chain amino acids (isoleucine and leucine). Based on SGR and FER, the optimal dietary valine requirements of juvenile blunt snout bream were determined to be 1.32% of the diet (3.88% of dietary protein) and 1.26% of the diet (3.71% of dietary protein), respectively, using broken‐line regression analysis.
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