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Journal Cover Journal of Applied Ichthyology
  [SJR: 0.51]   [H-I: 44]   [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  [1589 journals]
  • Growth and mortality of exploited fishes in China's coastal seas and their
           uses for yield-per-recruit analyses
    • Authors: C. Liang; D. Pauly
      Abstract: Given the scarcity of information suitable for other forms of fish stock assessments, the growth, and mortality of 10 important marine exploited fishes in China's coastal seas were estimated, based on published length-frequency data and the ELEFAN approach and software. The resulting parameters, complemented with growth curves from FishBase were then used for yield-per-recruit analyses. These 10 species were both traditional commercial species (Trichiurus lepturus, Larimichthys polyactis, Scomber japonicus) and less commercial interest species (Coilia nasus, Engraulis japonicus, Decapterus maruadsi, Psenopsis anomala, Coilia mystus, Setipinna tenuifilis, Harpadon nehereus). The yield-per-recruit analyses indicated that the fishing mortality experienced by these 10 fish species was very high, especially in view of the extremely small cod-end mesh sizes deployed by Chinese trawlers, of about 10 mm or less (vs. 25 mm as minimum legal size). More precisely, all 10 species suffered from growth overfishing, which was very pronounced in large species. Indeed, enlarging cod-end mesh size, by increasing mean sizes at first capture, would increase yield-per-recruit for all 10 fish species by a factor of up to 2.5. Obviously, such increases in mesh size would have to be in tandem with other management measures designed to ensure the sustainability of China's marine fisheries resources.
      PubDate: 2017-04-17T00:05:41.534645-05:
      DOI: 10.1111/jai.13379
       
  • Natural stranding of Atlantic sturgeon (Acipenser oxyrinchus Mitchill,
           1815) in Scot's Bay, Bay of Fundy, Nova Scotia, from populations of
           concern in the United States and Canada
    • Authors: N. D. Stewart; Y. Cormier, L. M. Logan-Chesney, G. Gibson, I. Wirgin, M. J. Dadswell, M. J. W. Stokesbury
      Abstract: Natural mortality of Atlantic sturgeon (Acipenser oxyrinchus) has been determined to be low (M = 0.07). Reported herein is the mortality by beach stranding of 11 Atlantic sturgeon in Scot's Bay, part of the inner Bay of Fundy in Nova Scotia, Canada on 22 June 2014. Genetic analyses, histological analysis and age determination were performed to determine origin, maturity stage and age of the stranded Atlantic sturgeon. Microsatellite and mitochondrial DNA analyses indicated that four of the Atlantic sturgeon (2 males and 2 females) were from the Saint John River, NB population, which was designated as threatened by the Committee on the Status of Endangered Wildlife in Canada. Seven Atlantic sturgeon (1 male, 5 females, 1 unknown) were from the Kennebec River, Maine population, that was listed as threatened under the Endangered Species Act in the U. S. Ageing of A. oxyrinchus Atlantic sturgeon by pectoral fin spine analysis determined that the mean age of the individuals from the Saint John River (x̄ = 24.25 years, SD = 5.0) and the Kennebec River (x̄ = 22.7 years, SD = 3.5) were not significantly different. This is the first report of a stranding event of Atlantic sturgeon, and describes a source of natural mortality affecting populations of concern in both Canada and the U. S.
      PubDate: 2017-04-17T00:05:38.134225-05:
      DOI: 10.1111/jai.13371
       
  • First occurrence of the oceanic puffer, Lagocephalus lagocephalus
           (Linnaeus, 1758) in Iskenderun Bay, north-eastern Mediterranean, Turkey
    • Authors: D. Erguden; M. Gurlek, C. Turan
      PubDate: 2017-04-17T00:05:36.212248-05:
      DOI: 10.1111/jai.13363
       
  • Length–weight relationships for two loach species, Sinibotia
           superciliaris (Günther, 1892) and Sinibotia reevesae (Chang, 1944)
           collected from the Tuojiang River, China
    • Authors: Z.-Y. Wen; C.-J. Qin, B.-W. Xie, D.-Y. Yuan, R. Li, Y.-C. Zou
      Abstract: Length–weight relationships were determined for two loach species, Sinibotia superciliaris (Günther, 1892) and Sinibotia reevesae (Chang, 1944). Samples were collected with gill nets (30 × 15 m, mesh-size 1.5 cm) and fish cages (mesh-size 0.5 cm) as well as by electroshock (CWB-2000 P, 12 V, 250 HZ) between May 2013 and June 2015 from the Tuojiang River in southwest China. It is believed that the size range covered is close to a commonly known size range of each species. The length–weight relationship values of b were determined as 3.105 for S. superciliaris and 3.381 for S. reevesae. The data will be helpful in further research regarding these species in the upper Yangtze River Basin.
      PubDate: 2017-04-17T00:05:26.171367-05:
      DOI: 10.1111/jai.13393
       
  • Characteristics of lake sturgeon Acipenser fulvescens Rafinesque, 1817 in
           a tributary of Lake Michigan, USA: Status of the Muskegon River population
           
    • Authors: B. S. Harris; C. R. Ruetz, A. C. Wieten, M. E. Altenritter, K. M. Smith
      Abstract: The overall goal of this study was to characterize the age, growth, condition, and total catch of lake sturgeon Acipenser fulvescens in a remnant population associated with a Lake Michigan, USA tributary. Lake sturgeon were captured (2008–2013) using large-mesh (25.4 and 30.5 cm) and small-mesh (6.4 and 7.6 cm) gill netting in Muskegon Lake (which connects the Muskegon River to Lake Michigan), and adults were captured with boat electrofishing in the Muskegon River. A total of 268 unique lake sturgeon (24.8–191.0 cm total length;
      PubDate: 2017-04-11T06:17:26.020411-05:
      DOI: 10.1111/jai.13365
       
  • Discards in bottom-trawl fishery in the western Black Sea (Turkey)
    • Authors: T. Yıldız; F. S. Karakulak
      Abstract: The aim of this study was to estimate the discards of target and non-target species from bottom trawlers (rhombic and 40 mm cod end mesh size nets) in the Black Sea. On-board sampling was conducted on the southwestern coasts of the Black Sea in the fishing ports of Rumelifeneri and Igneada for a total of 66 hauls on two commercial bottom trawlers from October 2012 to April 2013 and from October 2013 to April 2014. A total of 32 species were captured, including 25 species of fish, three crustacea, two echinodermata and two mollusca. Mullus barbatus and Merlangius merlangus euxinus were the target species, whereas 24 species were always discarded. Scophthalmus maximus and Pomatomus saltatrix were always retained. The two regions were similar in terms of catch and discard compositions, CPUE, DPUE and discard ratio. Discarding is important in the Black Sea commercial bottom trawl fishery and accounts for as much as 31.4% of the total bottom trawl catch. The results showed that the discard rates varied among species, depths (p = .04) and seasons (p = .0001). Finally, it was concluded that in the western Black Sea, when the impacts of depth and season are considered, that the discard quantity can be reduced.
      PubDate: 2017-04-11T06:17:10.130717-05:
      DOI: 10.1111/jai.13362
       
  • Length–weight relationships of nine fish species from the Tongjiang
           section of the Songhua River, China
    • Authors: T. B. Huo; M. Y. Yuan, J. L. Wang, P. L. Li, W. Liu, X. C. Wu
      Abstract: Length–weight relationships were evaluated for nine fish species from the Tongjiang section of the Songhua River in China. A total of 675 fish specimens were collected from 4 May to 29 October 2014. Length–weight relationships for six fish species (Romanogobio tenuicorpus, Leuciscus waleckii, Opsariichthys bidens, Microphysogobio amurensis, Pelteobagrus ussuriensis and Misgurnus mohoity) were new to FishBase in 2015, but the length–weight relationships of P. ussuriensis was studied by Ma in 2015. New data on M. mohoity is offered, and this study also shows new maximum total lengths for three fish species. The r2 values ranged from .95 to .99. Values of b varied from 2.504 to 3.471.
      PubDate: 2017-04-11T06:16:54.234966-05:
      DOI: 10.1111/jai.13373
       
  • Koi herpesvirus infection in experimentally infected common carp Cyprinus
           carpio (Linnaeus, 1758) and three potential carrier fish species Carassius
           carassius (Linnaeus, 1758); Rutilus rutilus (Linnaeus, 1758); and Tinca
           tinca (Linnaeus, 1758) by quantitative real-time PCR and in-situ
           hybridization
    • Authors: L. Gaede; J. Steinbrück, S. M. Bergmann, K. Jäger, H. Gräfe, H. A. Schoon, S. Speck, U. Truyen
      Abstract: Only single cells in the carrier fish species Carassius carassius (Linnaeus, 1758) for koi herpesvirus (KHV) are infected in contrast to large numbers in the susceptible species common carp Cyprinus carpio (Linnaeus 1758). Several species of the family Cyprinidae have been described as virus carrier species, showing no clinical signs of a KHV disease but able to transmit the virus to other susceptible fish. In this study, 72 common carp Cyprinus carpio (Linnaeus, 1758), 36 tench Tinca tinca (Linnaeus, 1758), 36 crucian carp Carassius carassius (Linnaeus, 1758) and 36 common roach Rutilus rutilus (Linnaeus, 1758) were experimentally infected with KHV (isolate “Israel”) by immersion and kept at 20°C. The fish were euthanized at 12 timepoints over a period of 90 days and virus DNA was quantified in tissues by a real-time TaqMan PCR. Whereas KHV-DNA was found in Cyprinus carpio for up to 90 days, the virus DNA was detectable only in single individuals of Rutilus rutilus, Tinca tinca and Carassius carassius for up to 25 days after experimental virus exposure. Tissue samples of Cyprinus carpio and Carassius carassius were screened by in-situ hybridization. Positive signals were found in various organs of the common carp tested crucian carp. In the latter species a much smaller number of virus-positive stained cells was detected compared to the infected carp.
      PubDate: 2017-04-10T07:26:16.818707-05:
      DOI: 10.1111/jai.13368
       
  • Seasonal variability of gillnet selectivity in Chilean hake Merluccius
           gayi gayi (Guichenot, 1848)
    • Authors: D. Queirolo; A. Flores
      Abstract: This study examines the seasonal variability in gillnet size selectivity for the main Chilean hake (Merluccius gayi gayi) fishery off the coast of central Chile. Selectivity estimates were based on five gillnet mesh sizes (50, 60, 70, 80, 90 mm) in four traditional fishing areas, and during periods of low and high reproductive activity. Average fish length caught in the earlier period (low reproductive activity) was 30.8 cm LT (±4.17), and significantly longer (p  .05). For females, however, both the selectivity factor and the estimated modal lengths changed significantly depending on the time of year (p 
      PubDate: 2017-04-10T07:26:14.953916-05:
      DOI: 10.1111/jai.13336
       
  • Length–weight and length–length relationships of four native fish
           species from the Yalong River, China
    • Authors: B. S. Ma; B. Xu, K. J. Wei, L. J. Deng, W. X. Gan, X. Y. Zhu, Y. H. Yao
      Abstract: Length-weight and length-length relationships were estimated for four native fish species from the Yalong River and its tributaries, China. A total of 976 specimens were collected monthly using trap nets and electric fishing in May 2013 and July 2015 to February 2016. This study presents the first references on LWRs (length–weight relationships) and LLRs (length–length relationships) for three species (Gymnocypris firmispinatus, Paracobitis variegatus and Euchiloglanis kishinouyei). Moreover, maturation length, absolute fecundity and predominant food items for the four species were also described in the study.
      PubDate: 2017-04-10T07:26:07.282873-05:
      DOI: 10.1111/jai.13359
       
  • Leiomyosarcoma in pickhandle barracuda, Sphyraena jello Cuvier, 1829
    • Authors: V. Singaravel; A. Gopalakrishnan, K. Raja, R. Vijayakumar
      PubDate: 2017-04-10T07:21:10.551158-05:
      DOI: 10.1111/jai.13366
       
  • First record of Maccallumtrema xiphiados and the Philichthys xiphiae in
           the striped marlin Kajikia audax (Philippi, 1887) off Cabo San Lucas, Baja
           California Sur, Mexico
    • Authors: S. Ortega-García; S. Hernández-Trujillo
      PubDate: 2017-04-10T07:21:02.449584-05:
      DOI: 10.1111/jai.13364
       
  • Length–weight relationships of four small indigenous fish species from
           an inland artisanal fishery, Bangladesh
    • Authors: M. A. Islam; M. A. B. Siddik, M. A. Hanif, M. R. Chaklader, A. Nahar, I. Ilham
      Abstract: This study reports the length–weight relationships (LWRs) of four small indigenous species, Trichogaster lalius (Hamilton, 1822), Nandus meni (Hossain & Sarker, 2013), Lepidocephalichthys annandalei (Chaudhuri, 1912) and Botia dario (Hamilton, 1822) collected between July 2015 and August 2016 from fishermen's catches landed in an inland fish landing center, northeastern Bangladesh. In the study, a new maximum total length (TL) is given for L. annandalei and LWRs of three species T. lalius, N. meni and L. annandalei for the first time in FishBase. Estimated LWRs were W = .014 TL3.17, (r2 = .982) for T. lalius, W = .006 TL3.38, (r2 = .961) for N. meni, W = .004 TL3.27, (r2 = .965) for L. annandalei and W = .020 TL2.87, (r2 = .978) for B. dario.
      PubDate: 2017-04-10T07:20:59.473727-05:
      DOI: 10.1111/jai.13374
       
  • Survival, growth and physiological responses of juvenile Japanese flounder
           (Paralichthys olivaceus, Temminck & Schlegel, 1846) exposed to different
           dissolved oxygen concentrations and stocking densities
    • Authors: H.-Y. Guo; X.-Y. Dong, X.-M. Zhang, P.-D. Zhang, W.-T. Li
      Abstract: The aim of this study was to determine to what extent juvenile Japanese flounder can adapt to different stocking densities in captivity and to examine whether growth and some physiological parameters critical for welfare might be affected by different dissolved oxygen levels. Japanese flounder (Paralichthys olivaceus) juveniles (initial weight 1.27 ± 0.04 g/fish) were reared at five stocking densities (500, 1,000, 1,500, 2,000, 2,500 ind/m3) and two levels of dissolved oxygen (DO) concentration (5.5 ± 0.5 mg/L or 14 ± 2 mg/L) with duplicate tanks for each treatment in water-recirculating systems for 40 days. Survival and activity of superoxide dismutase (SOD) were not affected either by stocking density or dissolved oxygen, whereas final body weight, specific growth rate (SGR) and feed conversion efficiency (FCE) of fish under low DO concentration decreased significantly with increasing stocking density. In contrast, growth of fish reared in high DO levels were unaffected by the stocking density. Furthermore, fish in this group had a higher feed intake and, consequently, grew faster (SGR) and achieved a higher final weight than fish reared at the low DO level. A significant reduction in hemoglobin (Hb) concentration and red blood cell (RBC) count of fish were recorded as DO concentration increased. Furthermore, the activity of protease decreased significantly with increasing stocking density and increased significantly with increasing DO concentration. The ventilation frequency results indicate that gill ventilation decreased significantly as DO levels increased. This study demonstrates that stocking density can affect the growth performance and physiological parameters critical for welfare of juvenile Japanese flounder. Also shown is that pure oxygen supplementation is an effective way to improve the growth of juvenile Japanese flounder when reared at a high stocking density.
      PubDate: 2017-04-10T07:20:58.478838-05:
      DOI: 10.1111/jai.13369
       
  • Trophic ecology of two syntopic sciaenid species (Micropogonias furnieri
           (Desmarest, 1823) and Ctenosciaena gracilicirrhus) (Metzelaar, 1919) in a
           tropical bay in south-eastern Brazil
    • Authors: M. M. Martins; H. S. Mendonça, S. S. Rodrigues, F. G. Araújo
      Abstract: Analyzed were the diets of two closely related species of Sciaenidae (Micropogonias furnieri and Ctenosciena gracilicirrhus) coexisting in high abundance in the outer zone of Sepetiba Bay. Their sizes and seasonal niche dimensions were also analysed. The tested hypothesis was that these two abundant species do not overlap in the trophic niche despite occurring in the same area and having similar sizes and body shapes and where an intraspecific overlap is likely to occur. The stomach contents of 198 M. furnieri specimens (85–280 mm total length) and 198 C. gracilicirrhus (49–131 mm total length) were examined. Quarterly diurnal fish samplings were performed using bottom trawls between winter 2012 and autumn 2013. In each season, three replicate tows were taken against the current during 20 min at the bottom with a towing speed of circa 4.5 km/hr, covering a distance of approximately 1,500 m. The trawl had an 8 m headline, 11 m ground rope, 25 mm stretched mesh and 12 mm mesh cod-end liner. Significant differences were detected in the diet between the two species (Pseudo-F = 5.16; p = .001) and among size classes (Pseudo-F = 2.23; p = .001), but not among seasons (Pseudo-F = 0.36; p = .920), according to PERMANOVA. Micropogonias furnieri fed mainly on Polychaeta and Caprella, whereas C. gracilicirrhus fed preferably on Caprella. Both species tended to specialize as they grew in size, with M. furnieri preferring Polychaeta, and C. gracilicirrhus specializing in Caprella. As expected, a high intraspecific niche overlap was observed among the size classes within each species, but not at an interspecific level and with the two syntopic species using different feeding resources.
      PubDate: 2017-04-10T07:20:55.415965-05:
      DOI: 10.1111/jai.13360
       
  • Length–weight relationships of two sympatric species (Knipowitschia
           byblisia Ahnelt, 2011 and K. caunosi Ahnelt, 2011) in Köycegiz Lake,
           Turkey
    • Authors: D. Innal; D. Giannetto
      Abstract: This study provides basic information on length–weight relationships for Knipowitschia byblisia Ahnelt, 2011 and Knipowitschia caunosi Ahnelt, 2011, two endemic species of Köycegiz Lake Basin (Southern-West of Turkey). Samplings were carried out seasonally from 2014 to 2015 by means of beach seine nets with mesh sizes from 10 to 35 mm. A total of 343 individuals from the two fish species were examined, with more specimens belonging to K. byblisa (90.4%). The total length–weight relationships were calculated as: W = 0.0054 TL3.384for K. byblisia and W = 0.0058 TL3.417for K. caunosi, respectively.
      PubDate: 2017-04-10T07:20:52.519123-05:
      DOI: 10.1111/jai.13376
       
  • Growth performance and metabolic response of juvenile grouper Epinephelus
           moara (Temminck & Schlegel, 1842) fed low dietary protein and high lipid
           levels
    • Authors: S. M. Peng; C. J. Zhang, Q. X. Gao, Z. H. Shi, C. Chen, J. G. Wang
      Abstract: Nine test diets were formulated at three low levels of crude protein (P; 35%, 40% or 45%) and three high levels of crude lipid (L; 9%, 12% or 15%) to investigate whether Epinephelus moara differs in the nutrient requirements from any of the other closely-related grouper species, and if there are any indications that a further decrease in protein with increasing dietary lipid would induce a higher protein-sparing effect. Fish (20.34 ± 0.82 g/ind) were distributed among 27 experimental cages (100 cm diameter, 80 cm depth), with 20 fish per cage and three replicates for each test diet. The experiment was conducted over an 8-week period at a temperature of 23.9–25.7°C. Weight gain and specific growth rate (SGR) tended to increase either with an increase in dietary protein level (at the same lipid level) or with the increase in dietary lipid level (at the same protein level, except at the 45% protein level). The highest weight gain and SGR occurred in fish fed the diet P45/L12. The serum cholesterol, high-density lipoprotein-cholesterol (HDL-C) and low-density lipoprotein-cholesterol (LDL-C) contents in fish were significantly increased as the dietary lipid increased. The increase of dietary protein significantly decreased the activities of serum and hepatic alanine aminotransferase (ALT) as well as aspartate aminotransferase (AST). Hepatic fatty acid synthase (FAS) activity significantly increased with the decrease of dietary protein and lipid levels (p 
      PubDate: 2017-04-10T07:20:51.473848-05:
      DOI: 10.1111/jai.13361
       
  • Development of polymorphic microsatellite loci for the design of
           management and conservation strategies of the critically endangered
           Barrens topminnow (Fundulus julisia, Williams & Etnier, 1982)
    • Authors: C. Hurt; A. Harman
      Abstract: The decline of the Barrens topminnow (Fundulus julisia), a small schooling fish endemic to the Barrens Plateau region of Middle Tennessee, is one of the most dramatic cases of species imperilment in eastern North America. Loss of undisturbed habitat, coupled with the introduction of the invasive Western Mosquitofish (Gambusia affinis) has led to the extirpation of 12 out of 14 natural populations since the 1980s. Identified is a set of 14 microsatellite loci to improve conservation and management strategies for the species. Four loci were cross-amplified using primers designed for congeneric taxa and 10 loci were developed from whole genome Illumina sequencing. Initial surveys in two populations suggest significant structuring of genetic variation and differing levels of heterozygosity among populations. These markers will contribute valuable information to ongoing conservation and management efforts.
      PubDate: 2017-04-10T07:20:47.876142-05:
      DOI: 10.1111/jai.13370
       
  • Length–weight relationships of three fish species in the East China
           Sea
    • Authors: Q. Wang; C. Y. Sha, J. Q. Zhang, D. F. Zhang
      Abstract: Length–weight relationships were determined for three fish species (Acanthopagrus latus Houttuyn, 1782; Acentrogobius caninus Valenciennes, 1837; and Nematalosa japonica Regan, 1917). Samples were collected from the East China Sea (N 27.306020, E 120.918026), from May to July in 2015–2016. Samples were collected using commercial trawls (5 cm main trawl and 3 cm codend mesh). Length–weight relationships for these three species were determined for the first time.
      PubDate: 2017-04-10T07:20:46.153674-05:
      DOI: 10.1111/jai.13375
       
  • Effects of dietary amino acid l-lysine on survival, growth and
           haemato-biochemical parameters in Indian catfish, Heteropneustes fossilis
           (Bloch, 1974), fingerlings
    • Authors: I. Ahmed
      Abstract: An 8-week feeding experiment was conducted to estimate the dietary lysine requirement of fingerling Indian catfish, Heteropneustes fossilis (total length = 6.35 ± 1.10 cm; weight = 4.70 ± 0.65 g) by feeding six isonitrogenous (400 g/kg CP) and isocaloric diets (17.90 kJ/g) containing six supplemental lysine levels ranging from 11.0 to 23.5 g/kg (diets I to VI, in incremental steps of 2.5 g/kg). Triplicate groups with 20 fish each were stocked in 75-L circular continuous flow-through troughs and fed experimental diets at 4% BW/day twice daily (08:00 and 18:00 h). Maximum live weight gain (304%), best-feed conversion ratio (FCR, 1.46) and protein efficiency ratio (PER, 1.71) were obtained at 18.5 g/kg dietary lysine, beyond which these values showed a slight declining tendency. Best values for somatic and hematological indices were also obtained at this level. Significantly (p 
      PubDate: 2017-04-06T04:44:04.691529-05:
      DOI: 10.1111/jai.13355
       
  • Length–weight relationships of 12 indigenous fish species in the Gajner
           Beel floodplain (NW Bangladesh)
    • Authors: M. Y. Hossain; M. A. Hossen, Z. F. Ahmed, M. A. Hossain, M. N. U. Pramanik, F. Nawer, A. K. Paul, D. Khatun, N. Haque, M. A. Islam
      Abstract: The length–weight relationships (LWRs) were studied for 814 individuals covering eight families and 12 species of fish, e.g., Botia dario, Botia lohachata, Channa orientalis, Esomus danricus, Heteropneustes fossilis, Macrognathus pancalus, Nandus nandus, Ompok pabda, Pethia phutunio, Pethia ticto, Trichogaster fasciata and Trichogaster lalius captured from the Gajner beel floodplain, northwestern (NW) Bangladesh. Samples were collected occasionally from catches of fishermen from November 2014 to October 2015 using different types of traditional fishing gear, including gill net (mesh size ranges from 1.0 to 3.0 cm), cast net (mesh size ranges from 1.0 to 2.0 cm), square lift net (mesh size ~1.0 cm) and conical and box trap. The total length (TL) and body weight (BW) were measured for each individual. The allometric co-efficient b values ranged between 2.64 (B. lohachata) to 3.27 (N. nandus) and were highly significant, with p 
      PubDate: 2017-04-06T04:44:03.205272-05:
      DOI: 10.1111/jai.13354
       
  • Fatty acid profiles of Trachinus radiatus Cuvier, 1829
           (Perciformes-Trachinoidei, Trachinidae)
    • Authors: D. Đikić; I. Landeka, D. Franjević, D. Skaramuca, R. Fuchs, S. Matić Skoko, P. Tutman, I. Lukić, B. Skaramuca
      Abstract: The goal of this study was to analyse the fatty acid (FA) profiles of the streaked (starry) weever (Trachinus radiatus), a prized food fish in the countries of its distribution. Fish (N = 20) were sampled in July 2011. Location: 42.761019°N, 17.765090°W; Adriatic Sea, Elaphite Islands near Dubrovnik, Croatia, at 5–10 m depth using longline hooks; body length ranges: 24.1–47.2 cm, weight ranges: 120–960 g. Morphological species determination was genetically confirmed (Folmer region of COI gene). Biochemical analysis of T. radiatus muscular tissue (filet) revealed average ± SD dry matter of 252.3 ± 14.8 g/kg w.w.; moisture of 747.7 ± 14.8 g/kg w.w., and ash of 28.0 ± 6.9 g/kg w.w. Intramuscular crude protein content exceeded the total lipid (TL = 11.9 ± 4.0 g/kg w.w.) content approximately 17.7 fold. Unsaturated FA (UFA) was higher than saturated FA (SFA), with a predominance of polyunsaturated FA (PUFA). The ω3:ω6 ratio was 4.9:1, respectively. Among individually determined fatty acids, the PUFA 22:6n3 (DHA) was highly present (29.99 ± 2.75% TL) followed by a relatively high 20:5n3 (EPA) content. There was 25 fold higher EPA content than of substrate αLNA, and a 15.5 fold higher DHA content to DPAn3. Such ratios indicate that besides trophic ingestion, FA bioconversion elongase/desaturase synthesis pathways toward ω3 PUFA in Weevers could be highly efficient.
      PubDate: 2017-04-06T04:43:59.169476-05:
      DOI: 10.1111/jai.13356
       
  • Length–weight and length–length relationships of 20 fish species from
           the upper Yangtze River, southwest China
    • Authors: F. Xiong; H. Y. Liu, X. B. Duan, S. P. Liu, D. Q. Chen
      Abstract: Length–weight (LWR) and length–length (LLR) relationships were estimated for 20 species of fish from the upper Yangtze River, southwest China. Samples were collected using multiple types of gear (2–6 cm mesh trammel nets, 2 cm mesh trap nets, and baited hooks) in Jiangjin and Yibin sections from 2007 to 2009. New maximum lengths for 16 species were recorded for FishBase. LWRs were significant for all species. Standard length–total length equations for converting size measurements for these 20 species are also presented. The results provide primary data for future fish research and conservation.
      PubDate: 2017-04-06T02:04:40.264371-05:
      DOI: 10.1111/jai.13358
       
  • Length–weight relationships of 10 freshwater fish species from an
           intermittent river basin, semi-arid region, Brazil
    • Authors: B. F. Terra; F. K. Teixeira, C. F. Rezende
      Abstract: The length–weight relationships for 10 freshwater fish species from an intermittent river basin in a semi-arid region of Brazil were analyzed. Specimens were caught using a dragnet (3.5 × 2.5; stretched mesh size 5 mm) during running and pool phases from January to November 2015. The specimens were measured for total length and weight. Previously unavailable in FishBase, the detailed length–weight relationships of Compsura heterura, Phenacogaster calverti, and Serrapinnus piaba are reported for the first time. All fish collected presented total lengths (TL) lower than the maximum reported in FishBase.
      PubDate: 2017-04-06T02:04:39.191403-05:
      DOI: 10.1111/jai.13357
       
  • Length–weight relationships of three fish species from the South
           China Sea
    • Authors: W. Xiong; M. R. Yi, C. X. Zhao, J. Y. Wu, X. Y. Ma, Z. L. Li, Y. R. Yan
      Abstract: The length–weight relationships were determined for three fish species: Histiopterus typus (Temminck & Schlegel, 1844), Branchiostegus argentatus (Cuvier, 1830), and Ilisha elongata (Anonymous [Bennett], 1830). Samples were collected from the South China Sea with commercial trawls in June 2016 using trawl nets. Prior to this study the length–weight relationships for these three species were unknown.
      PubDate: 2017-04-06T02:04:35.516556-05:
      DOI: 10.1111/jai.13367
       
  • Length–weight relationships of eight Asian freshwater fish species in
           Nam Theun 2 Reservoir (Laos PDR)
    • Authors: A. Tessier; J. Guillard, V. Chanudet, M. Cottet
      Abstract: Length–weight relationships (LWRs) were determined for eight Asian freshwater fish species that were not yet recorded in any peer-reviewed journal indexed in the Web of Science or the FishBase database. Fish specimens from Nam Theun 2 reservoir in Lao PDR, were collected from April 2012 to August 2016 using several methods to cover a large size-spectrum for each species. For LWRs using the general equation from Beckman (1948), the parameter b (slope value on the growth pattern) ranges from 2.908 (Puntius brevis) to 3.429 (Rasbora paviana). This study provides an update in maximum lengths for two species and first LWRs for eight common freshwater species found mainly in reservoirs, and thus represents a means for further population dynamic evolution analyses and local fisheries management.
      PubDate: 2017-03-29T01:30:51.076561-05:
      DOI: 10.1111/jai.13341
       
  • Length-weight relationships of four sharks caught in the Northern Persian
           Gulf and Oman Sea
    • Authors: H. Raeisi; E. Kamrani, R. Patimar, I. Sourinejad, S. Haghparast, B. Rahnema
      Abstract: The length–weight relationships (LWRs) for four little-known shark species collected in the Persian Gulf and Oman Sea from March 2014 to September 2015 are presented, namely: Carcharhinus dussumieri, Carcharhinus macloti, Chiloscyllium arabicum, and Chaenogaleus macrostoma.
      PubDate: 2017-03-27T01:25:50.239666-05:
      DOI: 10.1111/jai.13272
       
  • Back-calculating growth at age from scale readings for Squalius microlepis
           Heckel, 1843 and Scardinius plotizza Heckel & Kner, 1858 in the Neretva
           River basin (Bosnia and Herzegovina)
    • Authors: P. Ivanković; T. Treer, T. Tomljanović, Z. Knezović, S. Salaj
      PubDate: 2017-03-15T07:15:49.016296-05:
      DOI: 10.1111/jai.13349
       
  • Length–weight relationships of six coral reef-fish species from Chuuk,
           Federated States of Micronesia
    • Authors: J. Cuetos-Bueno; D. Hernandez-Ortiz
      Abstract: Length–weight relationships (LWR) were estimated for six reef species in Chuuk lagoon (Federated States of Micronesia) captured by commercial fishers. Specimens were sampled opportunistically over a period of 2 months between July and September 2014. Relationships include those for four common species not currently reported in FishBase (Caesio teres, Myripristis adusta, Lethrinus erythracanthus, and Chlorurus frontalis), and for two species with relationships based on just one or two samples (Scarus oviceps, and Plectropomus oligacanthus). While estimates for some species are tentative given limited size-range sampling, they still present an improvement in the currently available LWRs.
      PubDate: 2017-03-15T07:15:46.322564-05:
      DOI: 10.1111/jai.13339
       
  • Length–weight and length–length relationships of three Clupeonella
           species (Clupeidae) from the Caspian Sea
    • Authors: M. S. Alavi-Yeganeh; A. Vahedian, B. Bakhshaei, G. Bahmani
      Abstract: This study investigated length–weight and length–length relationships of three Clupeonella species: C. caspia, C. engrauliformis and C. grimmi captured in the southern Caspian Sea, Iran. Using a lantern net, 206 specimens were collected from July to August 2016. Presented for two of the species are the length–weight and the length–length relationships as well as the first reference on length–weight and length–length relationships for C. caspia in its distribution range.
      PubDate: 2017-03-13T01:40:53.361318-05:
      DOI: 10.1111/jai.13344
       
  • Occurrence of Nemipterus randalli Russell, 1986 (Nemipteridae) off Izmir
           Bay, Turkey
    • Authors: İ. Aydın; O. Akyol
      PubDate: 2017-03-13T01:40:50.926004-05:
      DOI: 10.1111/jai.13331
       
  • Length–weight relationship of six indigenous fish species from Deepor
           beel, a Ramsar site in Assam, India
    • Authors: S. Borah; B. K. Bhattacharjya, B. J. Saud, A. K. Yadav, D. Debnath, S. Yengkokpam, P. Das, N. Sharma, N. S. Singh, K. K. Sarma
      Abstract: Length–weight relationships for six small indigenous fish species, namely: Trichogaster chuna (Hamilton, 1822), Trichogaster lalius (Hamilton, 1822), Trichogaster fasciata Bloch & Schneider, 1801, Chanda nama Hamilton, 1822, Parambassis lala (Hamilton, 1822), and Macrognathus aral (Bloch & Schneider, 1801) were studied for the first time from Deepor beel, a Ramsar site (589 ha water spread area) located in Assam, India. A total of 617 fish specimens were collected for the present study on a monthly basis from February to August in 2016 from landing centres adjoining the beel. In the present study, b value ranges from 2.778 to 3.215, which is within the normal range. The LWRs for these six fish species from Deepor beel had not yet been reported for FishBase.
      PubDate: 2017-03-13T01:40:49.938011-05:
      DOI: 10.1111/jai.13348
       
  • Sympatric and syntopic occurrence of cownose rays: Neonatal strategies for
           survival'
    • Authors: B. Sousa Rangel; V. Paes da Cruz, A. Rodrigues, M. L. Góes de Araujo, C. Oliveira, F. Foresti, R. Guimarães Moreira
      PubDate: 2017-03-13T01:40:49.030979-05:
      DOI: 10.1111/jai.13343
       
  • The effects of dietary Betaplus® and TechnoMos® on growth performance,
           blood parameters, and intestinal microflora in juvenile kutum, Rutilus
           kutum (Kamensky, 1901)
    • Authors: A. K. Amirkolaie; S. Karimzadeh, S. P. Miandehy
      Abstract: The main goal of the current study was to assess the combined effects of a dietary probiotic Betaplus and prebiotic TechnoMos on growth performance, blood biochemical parameters, and intestinal microflora in juvenile Rutilus kutum. Four experimental diets were prepared with the addition of Betaplus and/or TechnoMos to a basal diet for R. kutum juveniles. The diets were randomly assigned to one of 12 tanks, with three replications per diet. The results showed that supplementation of both pro- and prebiotic, separately or in combination, improved fish growth parameters (p 
      PubDate: 2017-03-13T01:40:47.465503-05:
      DOI: 10.1111/jai.13322
       
  • Length–weight and length–length relationships of eight fish species
           from Bohai Bay, China
    • Authors: H.-L. Xu; D.-X. Gu, R. Wang, J.-H. Sun, D.-Q. Bai
      Abstract: Length–weight and length–length relationships (LWRs and LLRs) for eight fish species collected quarterly by trawl net in Bohai Bay, China, were estimated in a total of 1,395 specimens from 2012 to 2015. These were Pholis fangi, Setipinna taty, Engraulis japonicus, Larimichthys polyactis, Thryssa kammalensis, Scomberomorus niphonius, Johnius grypotus and Sardinella zunasi. The LWRs for the last two fish species are first reports for FishBase.
      PubDate: 2017-03-13T01:40:46.046266-05:
      DOI: 10.1111/jai.13337
       
  • Occurrence of rare deep-water fish Sudis hyalina Rafinesque, 1810
           (Paralepididae) in Gökova Bay, Aegean Sea of Turkey
    • Authors: D. Türker; A. Kara, H. Bal, Ö. K. Tünay
      PubDate: 2017-03-13T01:40:45.150664-05:
      DOI: 10.1111/jai.13332
       
  • Salinity-induced changes to the survival, growth and glycogen distribution
           in the early fry stages of silver barb, Barbodes gonionotus (Bleeker,
           1850)
    • Authors: N. Romano; F. Syukri, A. Karami, N. Omar, N. Khalid
      Abstract: Five-week-old silver barb, Barbodes gonionotus, fry (initial length = 10 mm) were subjected to different salinities of 0, 3, 6 or 9 ppt for 17 days, to then assess their survival and growth. Whole body histological sections were stained with Periodic-acid Schiff (PAS). Groups of 15 fish were triplicated in each treatment with an ambient temperature (26–28°C). Results showed that growth and condition factor significantly decreased and increased (p  .05), between 0 and 6 ppt (at 98% and 87%, respectively), the decrease was significant at 9 ppt (22%). In addition, the fry at 9 ppt had fewer gill mucous cells as well as reduced PAS positive staining intensity within the liver and intestine. This suggests energy was becoming exhausted, leading to mortalities and lower growth. Silver barb early fry were relatively sensitive to elevated salinity, which was likely due to their young age, but short-term exposure to 3–6 ppt can be used to decrease potential freshwater diseases in the early nursery culture.
      PubDate: 2017-03-13T01:40:42.437748-05:
      DOI: 10.1111/jai.13338
       
  • Do young on-grown eels, Anguilla anguilla (Linnaeus, 1758), outperform
           glass eels after transition to a natural prey diet'
    • Authors: J. Dainys; H. Gorfine, E. Šidagytė, E. Jakubavičiūtė, M. Kirka, Ž. Pūtys, L. Ložys
      Abstract: Survival rates among European eels, Anguilla anguilla (Linnaeus, 1758), on-grown using a formulated diet in a commercial aquaculture facility, were compared with glass eels from the same cohort following their transition to a natural prey diet in the laboratory. Treatments included zero, 42-day, and 196-day periods of grow-out prior to 30-day experimental periods when eels were fed Chironomus spp. larvae (10 tanks, each containing 240-L water and 40 glass or 10 on-growing eels; 12:12 hr photoperiod; water temperature 18°C). All glass eels survived, compared to 87% (42-day) and 99% (196-day) for on-grown eels. Although the eels on-grown for 196 days had a high survival rate, they did lose weight. Farm-reared eels may have accumulated sufficient resources over the 196-days to survive the first 30 days after weaning from a formulated diet, but not for an additional 30 days (84% survival). Lack of superior survival rates among on-grown eels challenges the presumed benefits of releasing on-grown eels for population restoration.
      PubDate: 2017-03-13T01:40:33.824549-05:
      DOI: 10.1111/jai.13347
       
  • New maximum size records and length–weight relationships for two
           species, Corica soborna (Hamilton, 1822) and Mystus bleekeri (Day, 1877),
           from the Ganges River (NW Bangladesh)
    • Authors: M. Y. Hossain; M. A. Hossen, F. Nawer, D. Khatun, M. N. U. Pramanik, M. F. Parvin, K. Yahya
      Abstract: This study records new maximum lengths and provides length–weight relationships (LWRs) for two small indigenous fishes, Corica soborna (Hamilton, 1822) and Mystus bleekeri (Day, 1877), from the Ganges River in northwestern Bangladesh. Fishes were sampled sporadically using gill nets and cast nets from August 2015 to July 2016. New maximum recorded lengths weere 5.3 cm total length (TL) for C. soborna and 17.7 cm TL for M. bleekeri. The LWRs were highly significant (p .958. These findings will play a significant role in the fisheries resource management.
      PubDate: 2017-03-13T01:40:31.036829-05:
      DOI: 10.1111/jai.13342
       
  • Combination of dietary β-glucan and Bacillus subtilis as a potential
           synbiotic for pacu Piaractus mesopotamicus (Holmberg, 1887)
    • Authors: B. S. Cerozi; R. B. Zanon, T. S. C. Silva, J. E. P. Cyrino
      PubDate: 2017-03-13T01:40:29.064582-05:
      DOI: 10.1111/jai.13340
       
  • Length–weight and length–length relationships for six commercial
           fishes from southern Korean waters
    • Authors: S. H. Huh; J. M. Jeong, J. M. Park
      Abstract: Presented are the relationships between total length and weight, and between total length and standard length for six commercial fishes collected twice a month from local fish markets in southern Korea between 2005–2006 for Acanthopagrus schlegelii (Bleeker, 1854), Hexagrammos agrammus (Temminck & Schlegel, 1843) and Hexagrammos otakii (Jordan & Starks, 1895), and monthly in 2004 for Dentex tumifrons (Temminck & Schlegel, 1843), Doederleinia berycoides (Hilgendorf, 1879) and Scomberomorus niphonius (Cuvier, 1832). The LWR for D. tumifrons is estimated for the first time, and a new maximum length was recorded for S. niphonius. All total length and weight relationships were significant (all r2 > .953). The values of exponent b, estimated using simple linear least squares of log-transformed weight and length data, ranged from 2.945 to 3.317.
      PubDate: 2017-03-13T01:40:27.704507-05:
      DOI: 10.1111/jai.13345
       
  • Length–weight relationships of 18 fish species from Paraíba do Sul
           basin, Minas Gerais, Brazil
    • Authors: T. M. S. Freitas; G. M. Dutra, G. N. Salvador
      Abstract: The present study established the length–weight relationships (LWRs) for 18 species of freshwater fish from Paraíba do Sul River basin, southeastern Brazil. LWR parameters are estimated for the first time for seven of these species. The allometric coefficient b varied from 2.81 to 3.32. These data complement the effort to understand the biology of one of the most threatened Brazilian basins.
      PubDate: 2017-03-13T01:40:25.533054-05:
      DOI: 10.1111/jai.13346
       
  • Buccal swab: A tissue sampling method for refinement of experimental
           procedures involving rainbow trout
    • Authors: S. Colussi; V. Campia, M. Righetti, T. Scanzio, M. V. Riina, E. A. V. Burioli, C. Foglini, F. Ingravalle, M. Prearo, P. L. Acutis
      Abstract: Buccal swabbing is a minimally invasive method to obtain DNA and biological material from humans and animals, including fish. Reports on buccal swabbing in fish are few and only for a limited number of species. Rainbow trout (Oncorhynchus mykiss) is an important animal model and because the yield of DNA may vary among and within different species in individuals of different sizes, it was selected as useful to optimize the buccal DNA collection in this species. Different storage methods were evaluated, aimed at DNA preservation by limiting DNA degradation and bacterial growth, using commonly available and inexpensive reagents. DNA quality was also tested by amplification of a single-copy nuclear gene and a mitochondrial gene. The results suggest that ethanol is the best storage choice for buccal swab sampling in fish genetic studies, as well as suitable for small-bodied rainbow trout.
      PubDate: 2017-03-11T02:20:45.25244-05:0
      DOI: 10.1111/jai.13324
       
  • Diet, feeding patterns, and prey selection of subyearling Atlantic salmon
           (Salmo salar) and subyearling chinook salmon (Oncorhynchus tshawytscha) in
           a tributary of Lake Ontario
    • Authors: J. H. Johnson; K. J. Nash, R. A. Chiavelli, J. A. DiRado, G. E. Mackey, J. R. Knight, A. R. Diaz
      Abstract: Since juvenile Atlantic salmon (Salmo salar) and Chinook salmon (Oncorhynchus tshawytscha) occupy a similar habitat in Lake Ontario tributaries, we sought to determine the degree of diet similarity between these species in order to assess the potential for interspecific competition. Atlantic salmon, an historically important but currently extirpated component of the Lake Ontario fish community, are the focus of a bi-national restoration effort. Presently this effort includes the release of hatchery produced juvenile Atlantic salmon in Lake Ontario tributaries. These same tributaries support substantial numbers of naturally reproduced juvenile Pacific salmonids including Chinook salmon. Subyearling Atlantic salmon and subyearling Chinook salmon had significantly different diets during each of the three time periods examined. Atlantic salmon fed slightly more from the benthos than from the drift and consumed mainly chirononmids (47.0%) and ephemeropterans (21.1%). The diet of subyearling Chinook salmon was more closely associated with the drift and consisted mainly of chironomids (60.2%) and terrestrial invertebrates (16.0%). Low diet similarity between subyearling Atlantic salmon and subyearling Chinook salmon likely minimizes competitive interactions for food between these species in Lake Ontario tributaries. However, the availability of small prey such as chironomids which comprise over 50% of the diet of each species, soon after emergence, could constitute a short term resource limitation. To our knowledge this is the first study of interspecific diet associations between these two important salmonid species.
      PubDate: 2017-03-11T02:20:41.48794-05:0
      DOI: 10.1111/jai.13335
       
  • Diet of the blue shark Prionace glauca in the Ecuadorian Pacific Ocean
           during the years 2013 to 2015
    • Authors: P. Loor-Andrade; J. Pincay-Espinoza, R. Rosas-Luis
      PubDate: 2017-03-11T02:20:38.009375-05:
      DOI: 10.1111/jai.13329
       
  • A new record of Atlantic tripletail, Lobotes surinamensis (Bloch, 1790),
           in the Ligurian Sea (NW Mediterranean)
    • Authors: F. De Carlo; A. Massaro, C. Musumeci, I. Rossetti, P. Sartor, A. Ligas
      PubDate: 2017-03-11T02:20:30.677769-05:
      DOI: 10.1111/jai.13333
       
  • Immunolocalization of Na+/K+-ATPase, Na+/K+/2Cl− co-transporter (NKCC)
           and mRNA expression of Na+/K+-ATPase α-subunit during short-term salinity
           transfer in the gills of Persian sturgeon (Acipenser persicus, Borodin,
           1897) juveniles
    • Authors: S. A. Shirangi; M. R. Kalbassi, S. Khodabandeh, H. Jafarian, J.-H. Lignot
      Abstract: The study tests the physiological responses of Persian sturgeon, Acipenser persicus, during the abrupt release of juveniles from freshwater (FW) into brackish waters (BW = 11‰) of the Caspian Sea. Fish weight at release was 2-3 g (2.55 ± 0.41 g; 8.8 ± 0.58 cm TL). Totals of 160 individuals were randomly distributed into four fiber-glass aerated tanks (volume 60-L). Two tanks served as controls (FW groups), and two as exposure tanks for BW (Caspian Sea water = CSW). Fish were sampled at 0, 3, 6, 12, 24, 48 and 96 hr after abrupt transfer to CSW. Plasma osmolality, immunolocalization of Na+, K+ -ATPase (NKA) and Na+/K+/2Cl– (NKCC) Co-transporter, NKA activity and the NKA α-subunit mRNA expression were analyzed. Blood osmolality of fish transferred from FW to CSW increased significantly within hours post-transfer (p 
      PubDate: 2017-03-10T10:39:15.766216-05:
      DOI: 10.1111/jai.13260
       
  • Length–weight relationships for three small reef-fishes from the
           Argentine coast: Helcogrammoides cunninghami (Smitt, 1898), Ribeiroclinus
           eigenmanni (Jordan, 1888), and Hypleurochilus fissicornis (Quoy and
           Gaimard, 1824)
    • Authors: M. F. Ríos; A. J. Irigoyen, D. E. Galván, S. M. Delpiani
      Abstract: In this study the first length–weight relationships are provided for Helcogrammoides cunninghami and Ribeiroclinus eigenmanni inhabiting subtidal rocky areas in northern Patagonia, and for Hypleurochilus fissicornis inhabiting intertidal rocky areas in Buenos Aires Province. Specimens were collected between 2009 and 2016, from seven different locations in northern Patagonia and Buenos Aires Province (Southwest Atlantic Coast; 37°–42°S), using a trawling dredge or a small hand net. New maximum lengths were recorded for R. eigenmanni and H. fissicornis.
      PubDate: 2017-03-10T10:39:03.273174-05:
      DOI: 10.1111/jai.13327
       
  • Length–weight relationships of two mugilid species from tropical
           estuarine systems in Alagoas, northeastern coast of Brazil
    • Authors: V. E. L. Silva; E. C. Teixeira, V. S. Batista, N. N. Fabré
      Abstract: Length-weight relationships were estimated for two mugilid species from estuarine systems in Alagoas, northeastern Brazil. Fish were sampled monthly using nylon monofilament gillnets with different mesh sizes during two fishery surveys. The first LWR reference for Mugil curvidens and new maximum lengths for both M. rubioculus and M. curvidens are provided.
      PubDate: 2017-03-09T07:05:29.170198-05:
      DOI: 10.1111/jai.13325
       
  • Morphometric analysis of otoliths of juvenile crucifix sea catfish Sciades
           proops (Valenciennes, 1840)
    • Authors: K. M. F. Freire; C. S. Oliveira, L. C. Rosa
      Abstract: The objective of this study was to analyze the morphometry of otoliths for Sciades proops juveniles by testing the hypothesis of equality in morphometric relationships for the right and left otoliths, which could then be interchangeably used to estimate fish size or weight. Samples were obtained monthly directly from anglers after each event that took place off the state of Sergipe from March/2014 to April/2015. Anglers used rod and reel during these events, with no restriction on hook size or line thickness. Each fish specimen sampled had their total weight (W, g) and total length (TL, cm) measured and their lapillus otoliths removed and stored separately. Each otolith had its length (OL), width (OWi), and thickness (OT) measured (all in mm) under a stereomicroscope. Otoliths were weighed using a precision scale (OW, g). A total of 883 specimens were sampled: TL = 12.0–60.5 cm and W = 9.8–1880 g. The weight-length relationship for the juvenile fishes was W = 0.0052TL3.086 and for their otoliths was OW = 0.0002OL3.177. The weight-length and length-length relationships fitted for each otolith (right and left) were not statistically different and thus all relations were estimated for grouped otoliths. The length-length relationships for the otoliths were: OWi = 0.947OL−0.205 and OT = O.484OL−0.698. The relationship estimated for juvenile fish and otolith weight was Wj = 1076.1OW−9.120. For juvenile fish total length and otolith length, width and thickness, the following relationships were estimated: TLj = 4.028OL−3.199, TLj = 4.208OWi−2.091, and TLj = 7.824OT + 3.659, respectively. Relationships between fish and otolith size, and between fish and otolith weight indicated a change in slope close to Lm50, which should be better explored when more adult specimens are available.
      PubDate: 2017-03-08T04:40:34.29965-05:0
      DOI: 10.1111/jai.13321
       
  • Length weight relationships of two small indigenous cyprinid fishes,
           Osteobrama cotio (Hamilton, 1822) and Salmophasia phulo (Hamilton, 1822)
           from Panchet Reservoir, Damodar River (tributary of River Ganga), India
    • Authors: K. M. Sandhya; U. K. Sarkar, G. Karnatak, L. Lianthuamluaia, V. Kumar, S. Kumari, D. Panda, P. Mishal, Y. Ali
      Abstract: Length–weight relationships were determined for two small indigenous cyprinid fishes: Osteobrama cotio (Hamilton, 1822) and Salmophasia phulo (Hamilton, 1822) collected from Panchet reservoir, Damodar River, India. About 143 specimens of Osteobrama cotio (5.2–10.4 cm TL) and 113 specimens of Salmophasia phulo (2.9–8.2 cm TL) were collected from November 2014 to June 2016 using gillnets of mesh size ranging from 25 to 120 mm (STR) and dragnets of mesh size 10–20 mm (STR). No previous information on LWRs for these two species from an Indian reservoir was available in the literature.
      PubDate: 2017-03-08T04:40:28.232016-05:
      DOI: 10.1111/jai.13328
       
  • Length–weight and length–length relationship of Strongylura
           strongylura (van Hasselt, 1823) and Hyporhamphus limbatus (Valenciennes,
           1847) from Chilika Lake, India
    • Authors: S. K. Karna; M. Mukherjee, V. R. Suresh, R. K. Manna, H. M. Manas, R. K. Raman
      Abstract: Analyzed were the length–weight relationship (LWR) and length–length relationship (LLR) of two fish species, Strongylura strongylura (family Belonidae) and Hyporhamphus limbatus (family Hemiramphidae) from Chilika Lake, India. A total of 616 specimens were sampled bi-monthly from August 2014 to June 2016 using seine nets and screen barrier nets operated by local fishermen that were used for the present estimates.
      PubDate: 2017-03-08T04:40:26.292271-05:
      DOI: 10.1111/jai.13334
       
  • Partial replacement of fishmeal in diets for turbot (Scophthalmus maximus,
           Linnaeus, 1758) culture using blue mussel (Mytilus edulis, Linneus, 1758)
           meat
    • Authors: M. Weiß; B. H. Buck
      Abstract: The purpose of this study was to investigate whether meat from blue mussels (Mytilus edulis) harvested from offshore structures could be used as an alternative protein source in aquaculture fish feed for turbot (Scophthalmus maximus). Two feeding experiments with turbot were conducted in an initial experiment to test the applicability of mussel meal as a fishmeal replacement and/or supplement in turbot feed. In experiment A, the welfare, acceptance, and digestibility of feedstuff with 100%, 50% and 0% of mussel meal replacement for the fishmeal were tested for 8 weeks. In experiment B that followed, the convenience ratio of mussel meal protein in turbot feed for optimum growth was examined. Feedstuff with 25%, 10% and 0% of mussel meal were also fed for 8 (+6) weeks. Growth rates of fish were measured every 2 weeks and their health condition (liver somatic index) determined at the beginning and end of the experiments. Experiment A revealed that a replacement of fishmeal with either 100% or 50% mussel meal resulted in depressed growth (SGR: 1.31 ± 0.04 with 100% mussel meal; 1.54 ± 0.04 with 50% mussel meal; 1.71 ± 0.07 with 0% mussel meal). Experiment B revealed that a fishmeal replacement with 10% or 25% of mussel meal did not reduce growth nor did it have a negative effect on the health of the tested turbot. The study revealed that mussel meal has a high potential to serve as a supplement or as a fishmeal replacement in feed for turbot raised in aquaculture systems. Thus, its use in commercial aquaculture should be given future consideration.
      PubDate: 2017-03-08T04:40:24.988674-05:
      DOI: 10.1111/jai.13323
       
  • Predicting impacts of south-to-north water transfer project on fish
           assemblages in Hongze Lake, China
    • Authors: M.-L. Lin; S. Lek, P. Ren, S.-H. Li, W. Li, X. Du, C.-B. Guo, R. E. Gozlan, Z.-J. Li
      Abstract: The Chinese government implemented the ambitious south-north water transfer project (SNWTP), which aims to transport water from the Yangtze to the north of China where water shortages are severe. Although the ecological impacts of this project have been addressed publically, there remains a poor understanding of the effects of such large-scale water transfers on the populations of aquatic species. The potential ecological impacts of such water transfers on the Hongze Lake fish assemblages are assessed here using Self-Organizing Map (SOM) and Random Forest (RF) modeling. Using SOM, twenty-three fish species in 15 sampling sites were classified into two assemblages and four sub-assemblages corresponding to four distinct habitats (deep water macrophytes, deep water bare silt, shallow water bare silt, and shallow water macrophytes). The RF model further showed that water depth and transparency were the abiotic drivers underpinning fish assemblages in Hongze Lake. As the SNWTP is forecasted to modify the distribution of water depth and water clarity, major knock-on effects are expected on downstream lake fish assemblages.
      PubDate: 2017-03-04T01:51:27.750417-05:
      DOI: 10.1111/jai.13251
       
  • Comparison of body composition and sensory quality of wild and farmed
           whitefish (Coregonus macrophthalmus [Nüsslin, 1882])
    • Authors: S. E. Goebel; J. Gaye-Siessegger, J. Baer, J. Geist
      Abstract: This study compared the body composition (fillet yield, chemical composition and lipid quality of fillets) and sensory quality of captured wild (by gillnet in August 2011) with experimentally raised farmed (reared in concrete flow-through raceways, average water temperature 10 ± 3°C) whitefish, Coregonus macrophthalmus, from Lake Constance. The study was conducted in 2011 using 28 wild and 24 farmed market-sized fish of approximately equal total lengths (25.1 ± 1.21 and 25.6 ± 1.28 cm). Farmed female Coregonus macrophthalmus exhibited a 3.3% lower fillet yield resulting from larger gonads and a shallower body shape. The protein contents of farmed and wild fillets were equal (17.5% vs. 17.4%), but farmed fish fillets contained less moisture (76.1% vs.77.4%), less ash (1.2% vs. 1.6%), and more lipid (5.1% vs. 4.1%) than wild-caught specimens. Levels of monounsaturated fatty acids (MUFA) were higher in farmed fish (42.0 vs. 31.0 g/100 g lipid), as well as the levels of polyunsaturated fatty acids (PUFA; 26.0 vs. 19.7 g/100 g lipid), in particular 22:6n−3 (docosahexaenoic acid, DHA; 7.3 vs. 2.1 g/100 g lipid). Conversely, wild fish fillets contained significantly more 20:4n−6 (arachidonic acid, AA; 1.6 vs. 0.4 g/100 g lipid) and 20:5n−3 (eicosapentaenoic acid, EPA; 4.1 vs. 3.2 g/100 g lipid). Sensory evaluation of odour, colour, texture and flavour by an experienced six-person panel revealed a significant preference for the colour (79% vs. 21%) of farmed fish fillets. In conclusion, farmed whitefish can be strong competitors to wild whitefish in terms of product quality, with higher levels of healthy fatty acids and a more attractive fillet colour. Farmed Coregonus macrophthalmus thus represents a promising and pragmatic approach, compensating for the current capture decline in the whitefish fisheries of Lake Constance.
      PubDate: 2017-03-02T01:30:28.918408-05:
      DOI: 10.1111/jai.13318
       
  • Length–weight relationships for 19 headwater fish species from streams
           in the Sinos River basin, southern Brazil
    • Authors: C. Doebber; D. A. Antonetti, U. H. Schulz
      Abstract: This study reports the length–weight relationship estimates (LWRs) for 19 fish species inhabiting low order headwater streams in the Sinos River basin of southern Brazil. Between 2010 and 2014, 19 species at 47 sites were sampled in 10 sub-basins by electrofishing in winter and summer. For two species, Bryconamericus iheringii and Phalloceros caudimaculatus, the estimates in this study offer new maximum size ranges compared to previous studies.
      PubDate: 2017-02-28T01:15:57.012625-05:
      DOI: 10.1111/jai.13319
       
  • Japanese eel (Anguilla japonica Temminck & Schlegel, 1846) propagation
           using cryopreserved sperm samples
    • Authors: T. Müller; H. Matsubara, Y. Kubara, Á. Horváth, J. F. Asturiano, B. Urbányi
      Abstract: The aim of this study was to test the artificial seminal plasma (ASP) as the extender as well as methanol as the cryoprotectant for cryopreservation, and to collect information on the fertilizing capacity of cryopreserved sperm samples. Eggs from Japanese eel, Anguilla japonica, females were control-fertilized with native sperm diluted with ASP and cryopreserved sperm (ASP as extender [in 1:100 ratio] and 10% methanol in v/v final concentration). No statistical differences (p 
      PubDate: 2017-02-28T01:15:46.489591-05:
      DOI: 10.1111/jai.13316
       
  • Effects of feeding rate on the growth performance of gynogenetic albino
           sterlet, Acipenser ruthenus (Linnaeus, 1758) larvae
    • Authors: B. Laczynska; M. A. M. Siddique, T. Liszewski, M. Kucinski, D. Fopp-Bayat
      Abstract: The feeding rate effects were studied on the growth performance of gynogenetic diploid larvae of sterlet Acipenser ruthenus during the first 4 weeks of exogenous feeding. The experimental rearing was conducted from 7 to 38 days post-hatch (dph) in a circulation system. This was set up in four groups with three replicates (440 individuals/replicate), viz: AC-control larvae fed Artemia sp., CFC-control larvae fed compound feed, AG-gynogenetic larvae fed Artemia sp., and CFG-gynogenetic larvae fed compound feed. The larvae were reared in glass tanks (44 L volume, 10 individuals/L) with the temperature maintained at 18 ± 0.5°C, photoperiod of 12L:12D and water flow regime of 1-L/min and fed 50%, 25%, 25%, and 9% of their total biomass/day during feeding. Highest TL and WBW of gynogenetic diploid larvae (AG) were observed with 50.6 ± 1.2 mm and 607.3 ± 36.1 mg (n = 30) at 38 dph. Highest TL and WBW of control larvae (AC) were recorded with 49.5 ± 3.8 mm and 600.8 ± 88.0 mg (n = 30), respectively, with 73.1% ± 11.4% survival; the lowest survival rate was at 46.4% ± 7.1% (n = 30) for the CFG group. The results indicate that the gynogenetic and normal larvae of sterlet fed with live food (Artemia nauplii) from 7 dph can achieve higher growth and survivability compared to the larvae fed with formulated test feed. Results of this study suggest that the effective rearing of sterlet larvae from 7 to 38 dph strongly depends upon the types of feed rather than the genome manipulation performed.
      PubDate: 2017-02-28T01:15:36.635172-05:
      DOI: 10.1111/jai.13317
       
  • Length–weight relationships of three fish species from the Bay of
           Bengal, Bangladesh
    • Authors: M. R. Mondol; M. A. Hossen, D. A. Nahar
      Abstract: The present study describes the length–weight (LWR) of three fish species, Chela cachius (Hamilton, 1822), Coilia ramcarati (Hamilton, 1822) and Sardinella gibbosa (Bleeker, 1849) captured in the Bay of Bengal, Bangladesh, from December 2014 to November 2015. Fishes were captured with either gill nets (mesh size 2.0–5.0 cm) or set bag nets (mesh size 2.0–4.0 cm). The b values in the study varied from 2.88 (C. ramcarati) to 3.00 (S. gibbosa), with a mean a value of 2.94 at p 
      PubDate: 2017-02-23T23:40:24.219536-05:
      DOI: 10.1111/jai.13268
       
  • Morphometric relationships for four Scombridae fish species in Australian
           waters
    • Authors: S. P. Griffiths; G. C. Fry, F. J. Manson, R. D. Pillans
      Abstract: Morphometric relationships (length–weight and fork length–total length) were estimated for four scombrid species (Thunnus tonggol, Euthynnus affinis, Cybiosarda elegans, and Rastrelliger kanagurta) that are of growing importance to fisheries, but are also important predators representing different trophic levels in the neritic regime of Australian waters. The sample of 1,137 fish representing a broad size range for each species produced highly significant model fits (r2 > .95) that provide researchers with reliable information for future biological studies, stock assessment, and ecosystem models.
      PubDate: 2017-02-15T07:25:31.629337-05:
      DOI: 10.1111/jai.13136
       
  • Issue Information
    • Pages: 157 - 158
      PubDate: 2017-03-16T01:30:16.657261-05:
      DOI: 10.1111/jai.13352
       
  • Title page and Logo
    • Pages: 159 - 160
      PubDate: 2017-03-16T01:30:23.798806-05:
      DOI: 10.1111/jai.13350
       
  • Proceedings of the XVth European Congress of Ichthyology 2015 (Porto,
           Portugal)
    • Authors: Alberto T. Correia; Steven E. Campana, Jeffrey M. Leis, Kenneth W. Able, Harald Rosenthal
      Pages: 162 - 162
      PubDate: 2017-03-16T01:30:17.125878-05:
      DOI: 10.1111/jai.13315
       
  • Otolith morphometry and microchemistry as habitat markers for juvenile
           Mugil cephalus Linnaeus 1758 in nursery grounds in the Valencian
           community, Spain
    • Authors: R. Callicó Fortunato; V. Benedito Durà, A. Volpedo
      Pages: 163 - 167
      Abstract: The aim of this study was to identify and characterize juvenile Mugil cephalus (flathead grey mullet) habitats in the Valencian community by means of otolith morphometry and microchemistry. Specimens (total length: 250–350 mm) were obtained from October 2011 to March 2012 with gill nets in two protected wetlands: the Parque Nartural de l'Albufera de Valencia (AV) (n = 45), a Mediterranean lake; and the Parque Natural Salinas de Santa Pola (SP) (n = 37), a coastal salt marsh. Otolith shape indices (circularity, rectangularity, aspect ratio, surface occupied by sulcus, ellipticity and form factor) and microchemistry (Sr/Ca and Ba/Ca ratios) were measured and compared as area markers. The chemical composition of the water in both areas was also obtained. Morphometric results showed, by an ANOVA with Bonferroni contrasts, that saccular otoliths from AV individuals had more edge complexity, hence a higher circularity index (p 
      PubDate: 2017-01-30T02:16:57.345071-05:
      DOI: 10.1111/jai.13291
       
  • Identification of adult and juvenile Atherina presbyter Cuvier, 1829 in a
           marine coastal area adjacent to Tagus estuary (NE Atlantic): A molecular
           tool for an ecological question
    • Authors: F. Almada; P. Carpi, F. Carlos, S. M. Francisco, A. M. Faria, R. Lungu, P. Duarte-Coelho, J. Neto, E. J. Gonçalves, J. I. Robalo
      Pages: 168 - 173
      Abstract: A simple PCR-RFLP consisting in the digestion of a fragment of the 12S ribosomal RNA (12SrRNA) with species-specific restriction enzymes (MboII and HinfI) was developed to distinguish northeastern Atlantic species in the genus Atherina. Unambiguous identification of morphologically similar sympatric species is frequently difficult, especially when younger specimens are included in the analysis. Genetic and morphological analysis of a total of 123 atherinids collected near the mouth of the Tagus estuary (west Portugal) confirmed that only Atherina presbyter (sand smelt) adults and juveniles are recurrently using these marine rocky habitats as spawning and nursery grounds, respectively. The importance of applying non-destructive methods is emphasized. In the future, the conditions involved in the transition from marine A. presbyter to estuarine/riverine A. boyeri should be further evaluated along with the ability of larvae and juveniles to cope with river flow and tidal currents drift.
      PubDate: 2017-02-08T07:30:59.247692-05:
      DOI: 10.1111/jai.13296
       
  • Disturbed fish fauna zonation as an indicator of large-scale human impact:
           A case study (2011–2012) of the large, lowland Warta River, Poland
    • Authors: A. Kruk; M. Ciepłucha, G. Zięba, D. Błońska, L. Marszał, S. Tybulczuk, M. Tszydel, T. Penczak
      Pages: 174 - 188
      Abstract: The aim of the study was to assess whether ichthyofauna variability follows the natural downstream gradient or the degradation gradient, and to assess the bioindication potential of fish zonation. The study was conducted along the entire length (795 km) of the lowland Warta River, Poland, wherein the complexity of the ecotone zone and availability of hiding places for fish decreased downstream. The catchment of the middle course carried a heavy load of pollutants. In the lower course, groynes were common, the channel width exceeded 100 m and the mean discharge reached 210 m3/s. In 2011–2012, single-run electrocatches of fish and lampreys were performed at 73 sites, generally while wading along 100 m long reaches of both riverbanks (farthest upper course, depth ≤ 0.6 m) or drifting in a boat along a 500 m riverbank stretch (in the remaining river parts). An indicator species analysis allowed identification of species associated significantly with particular river sections: one (a rheophil) in the source fragment (S1), seven (all rheophilic) in the upper course (S2), three in the middle course (S3), and nine (including three rheophils) in the lower course (S4). On this basis, the S1 was classified as an impoverished grayling zone, S2 as a barbel zone, and S4 as the bream zone. Section S3 remained unclassified, as its ichthyofauna was in the worst condition due to: (i) the strong destabilizing upstream impact of the Jeziorsko dam reservoir, (ii) large amounts of wastewater discharged from towns located in the catchment area of this section and (iii) the lack of unpolluted tributaries that could serve as sources of recolonizers. In summary, in the human-modified Warta River, the variability of fish assemblages followed a degradation gradient, which was also reflected in the disturbed fish zonation. Consequently, this study confirms the usefulness of a fish fauna zonation analysis for the bioindication of large-scale human impacts in rivers.
      PubDate: 2017-02-28T01:15:41.03277-05:0
      DOI: 10.1111/jai.13297
       
  • Discovery of a spawning area for anadromous Coilia nasus Temminck et
           Schlegel, 1846 in Poyang Lake, China
    • Authors: T. Jiang; J. Yang, M. J. Lu, H. B. Liu, T. T. Chen, Y. W. Gao
      Pages: 189 - 192
      PubDate: 2017-02-06T02:45:26.543986-05:
      DOI: 10.1111/jai.13293
       
  • Effect of body size on microhabitat preferences in stream-dwelling fishes
    • Authors: L. R. Manna; C. F. Rezende, R. Mazzoni
      Pages: 193 - 202
      Abstract: Microhabitat preferences of two stream-dwelling fish assemblages in two different Brazilian habitats of rainforest and semi-arid vegetation and comparisons within and between species were investigated. Data collection was from June to October 2012 in the Gato Stream within the rainforest, and from April to September 2012 in the Curu Stream within a semi-arid vegetation. Snorkeling observations and diving sessions along a 200-m stretch in each stream were performed. In total, 39 diving sessions were made over a total of 55 hr of underwater observations. Microhabitat preferences of the fish were analyzed by comparing resource use by fish species to the resource availability of the streams. Use of the microhabitat differed significantly between fish species within and between assemblages. In addition, there was a higher level of intraspecific variation in the fish assemblage in the semi-arid area. There was no significant correlation between fish size and microhabitat use, but five species showed a significant correlation between microhabitat use and distance from the stream bank. The findings herein point to highly intraspecific variability in both fish assemblages and highlight the importance of measuring individual differences in microhabitat preferences. Additionally, the versatility described for tropical freshwater fishes confirms the importance of measuring the intraspecific variability of their different ecological traits, and challenges the use of morphology as a predictor of fish ecology.
      PubDate: 2017-03-16T01:30:20.953015-05:
      DOI: 10.1111/jai.13320
       
  • Reproductive biology of the endemic dace Telestes karsticus Marčić and
           Mrakovčić, 2011 (Cyprinidae, Leuciscinae), in Croatia
    • Authors: Z. Marčić; A. Milković, M. Ćaleta, I. Buj, D. Zanella, P. Mustafić
      Pages: 203 - 208
      Abstract: This paper aims to establish how Telestes karsticus has adapted its reproductive behaviour to the hydrological conditions in Sušik Creek, which dries up in the summer. Initial data are provided on the reproductive biology of this endangered (EN) and endemic species of Croatia. Fish were collected at monthly intervals from July 2007 to July 2008 using a backpack electrofishing device. The spawning period lasts from late March to early May, confirmed by the gonadosomatic index (GSI) of males and egg diameter measurements. The value of GSI for both males and females is clearly cyclic, with only one maximum achieved in April. Sexual maturity is reached at an early age, with 50% becoming mature at total lengths longer than 41 mm (males) and 51 mm (females). Absolute fecundity of gravid females ranged from 201 to 3,188 eggs and relative fecundity was 153.6 ± 33.9 eggs per gram of body mass. Average egg diameter was determined as 1.22 ± 0.23 mm. The species is lithophilous, with eggs found in nature on gravel and among rocks. Water temperature during the spawning period ranged from 7.3°C to 13.5°C, with an average of 9.8°C. The spawning period coincides with the second peak of the 30-year-average water level in the creek, which runs dry during the summer period.
      PubDate: 2017-02-08T07:30:51.959891-05:
      DOI: 10.1111/jai.13306
       
  • Comparing androgens and androgen receptor expression in Cobitis taenia
           Linnaeus, 1958 males and females
    • Authors: A. Leska; A. Przybył, O. Jablonska, D. Juchno, A. Boroń, D. Pikuła, K. Kowalewska
      Pages: 209 - 216
      Abstract: It is assumed that males and females of spined loach, Cobitis taenia are characterized by different androgen receptor patterns of expression in some of the target tissues and by different concentrations of androgens during their reproductive season. Moreover, still little is examined as to whether tissue sensitivity to androgens follows the changes in androgen concentrations across the fish reproductive cycle. This was verified by determining androgen (testosterone and 11-ketotestosterone) concentrations in whole fish bodies using ELISA and analyzing AR gene expression in androgen target tissues (gonads, muscles and liver) using RT-PCR. The partial sequence of the AR gene in C. taenia was also identified. The study was conducted on the spined loach, Cobitis taenia – a multiple spawning species in decline, having hybridized with closely-related taxa to form allopolyploids. Males (18 individuals) and females (18) were collected from an exclusively diploid population (Legińskie Lake, Baltic Sea basin) in 2013 during pre-spawning (May), spawning (June) and post-spawning (August) seasons (six fish per sampling period per sex) using a fry trawl (with a 0.2 cm mesh). The reproductive status of the fish was verified by GSI and gonad histology. The results revealed seasonal variations in the concentration of androgens in C. taenia males and females as well as the dynamic, seasonal nature of AR gene expression in a tissue- and sex-dependent manner. Furthermore, a different seasonal profile of both androgens accompanied by a different pattern of AR expression in various tissues indicated complex physiological mechanisms engaged in AR regulation. These findings appear to be a good physiological basis for further studies using more advanced molecular techniques.
      PubDate: 2017-02-08T07:30:57.362681-05:
      DOI: 10.1111/jai.13295
       
  • Ontogenetic changes in otolith morphology and shape analyses in
           Chelidonichthys cuculus (Linnaeus, 1758) and Chelidonichthys lucerna (L.,
           1758)
    • Authors: S. Montanini; M. Stagioni, E. Benni, M. Vallisneri
      Pages: 217 - 220
      PubDate: 2017-03-02T01:30:35.058708-05:
      DOI: 10.1111/jai.13299
       
  • Recent distribution and phenetics of Turkestan gudgeon Gobio lepidolaemus
           Kessler, 1872 in rivers of southern Kazakhstan (Central Asia)
    • Authors: D. Bekkozhayeva; N. Mamilov
      Pages: 221 - 224
      PubDate: 2017-02-18T02:10:26.604609-05:
      DOI: 10.1111/jai.13301
       
  • Reproductive biology of Cisalpine pike (Esox cisalpinus Bianco &
           Delmastro, 2011) in Lake Trasimeno (Italy)
    • Authors: L. Pompei; D. Pieracci, D. Giannetto, A. Carosi, C. Cauzillo, R. Dolciami, L. Ghetti, M. Lorenzoni
      Pages: 225 - 229
      Abstract: The aim of this study was analysis of the data on the reproductive biology of the endemic Esox cisalpinus from Lake Trasimeno (central Italy). Data were collected with gillnets (mesh sizes 50–100 mm) from 2010 to 2014 during the reproductive period of the species. Fish age was assessed by scalimetric method and their condition evaluated by relative condition factor. Gonado-Somatic Index, fecundity, relative fecundity and egg sizes were calculated. A total of 1,543 specimens (862 females, 681 males) ranging in size from 28.0 to 103.0 cm were examined. Age composition ranged from 2+ to 12+. Both males and females matured at 2 years of age, at 28 cm total length. Fecundity ranged from 1,540 to 160,300 eggs; mean relative fecundity was 18,815 eggs/kg. Males and females were all found to be in good condition, with the relative fecundity increasing with improvements in their body condition.
      PubDate: 2017-02-16T06:05:25.723443-05:
      DOI: 10.1111/jai.13294
       
  • Precision of age estimates in striped snakehead Channa striata (Bloch,
           1793) from the Ganga River and its tributaries (rivers Gomti and Yamuna)
    • Authors: M. Afzal Khan; Salman Khan, Shahista Khan
      Pages: 230 - 235
      PubDate: 2017-02-07T05:56:06.655876-05:
      DOI: 10.1111/jai.13300
       
  • Age and growth of European eel, Anguilla Anguilla (Linnaeus, 1758), in
           Estonian lakes
    • Authors: M. Silm; P. Bernotas, M. Haldna, A. Järvalt, T. Nõges
      Pages: 236 - 241
      Abstract: To investigate the difference in growth rates of eels in the studied water bodies (Võrtsjärv, Ülemiste, Saadjärv, Vagula, Kaiavere and Kuremaa lakes, all in Estonia), 828 individual eel otoliths from the years 1999–2004 and 2008–2012 were examined for age determination. Anguilla anguilla captured in Lake Võrtsjärv mostly by professional fyke nets (mesh size>36 mm in the cod end) showed the best growth rate (gR = 6.9 cm/year) and had a high Fulton condition factor (K = 0.19), indicating suitable growth conditions in the lake. However samples caught using the same type of gear from the smaller lakes situated near Võrtsjärv, showed much slower gR (3 cm/year) and lower K (0.17) growth rates. The slowest gR (2.6 cm/year) was observed for specimens caught in Lake Kuremaa. Stocking densities are much higher in the small lakes of the region and have a direct effect on the growth rates.
      PubDate: 2017-02-28T01:15:55.976229-05:
      DOI: 10.1111/jai.13314
       
  • Age, growth and sex of the shanny, Lipophrys pholis (Linnaeus, 1758)
           (Teleostei, Blenniidae), from the NW coast of Portugal
    • Authors: M. G. Carvalho; C. Moreira, H. Queiroga, P. T. Santos, A. T. Correia
      Pages: 242 - 251
      Abstract: Age, growth, sex and gonadal maturation of the shanny, Liphorys pholis, were determined in specimens caught in a rocky intertidal area in northern Portugal in order to provide essential ecological data on the species. This study represents the first available reference in the literature for L. pholis in a southern European location. Totals of 251 individuals (115 females, 99 males, 37 undetermined; total length: 30–172 mm) were collected seasonally (November 2013, March, June, and September 2014) in a northern Portuguese rocky beach (Póvoa do Varzim: 41°23′47.79″N; 08°46′45.48″W) using fine-mesh aquarium fishnets during low tides. Marginal increment analysis showed that one translucent and one opaque zone was formed each year in the sagittal otoliths. Ages of L. pholis ranged from 0 to 6 years. Males were larger and older than females. The von Bertalanffy growth equation parameters considering all individuals were L∞ = 184 mm, K = 0.26 mm/year, t0 = −1.34. The annual variation of the fish condition and hepatosomatic indexes appeared to be related to the mobilization of the somatic reserves prior to reproduction. Maximum gonadosomatic index for males and females coincided with the breeding seasons (November and March). The sex ratio was close to 1:1, all maturity stages included. Furthermore, some stages of sexual development in males and females were observed during the same season, and several germinal cells were also observed at the same time within a single ovary or testis, indicating that L. pholis is an asynchronous and multiple spawner. Maturation for both sexes appears to be around 70 mm TL and prior to reaching 1 year of age.
      PubDate: 2017-02-07T04:00:50.088347-05:
      DOI: 10.1111/jai.13307
       
  • An unusual central cavity in Odontoscion dentex (Cuvier, 1830) sagittal
           otoliths
    • Authors: F. A. Daros; H. L. Spach, A. T. Correia
      Pages: 252 - 255
      PubDate: 2017-02-06T05:55:50.191894-05:
      DOI: 10.1111/jai.13308
       
  • Morphological comparison of Delminichthys ghetaldii (Steindachner, 1882),
           D. adspersus (Heckel, 1843), D. jadovensis (Zupančič & Bogutskaya, 2002)
           and D. krbavensis (Zupančič & Bogutskaya, 2002), endemic species of the
           Dinaric karst, Croatia
    • Authors: P. Mustafić; I. Buj, M. Opašić, D. Zanella, Z. Marčić, M. Ćaleta, R. Šanda, S. Horvatić, M. Mrakovčić
      Pages: 256 - 262
      Abstract: The objectives of this study were to gain a new understanding of the morphology of four endemic Delminichthys species, to determine the presence of morphological differences among populations and species, and to reveal reductive characters that might be connected with underground migrations. Morphometric and meristic characters were measured and statistically compared between populations and species. The study was conducted in the Dinaric region of Croatia and Bosnia and Herzegovina in the year 2013. Interpopulation variability observed for body shape (all size-independent morphometric characters significantly differed among populations) could be a reflection of the varying ecological conditions, although it might also imply the isolation of populations belonging to the same species. The number of lateral line scales (21–37 in D. krbavensis, 47–63 in D. jadovensis, 52–74 in D. adspersus, 88–105 in D. ghetaldii) proved to be the best diagnostic character for the Delminichthys species. Nevertheless, differences among the species in the number of pectoral and ventral fin rays, colouration, appearance of the lateral line, position of the mouth and presence of the groove above the upper lip were also observed.
      PubDate: 2017-02-08T07:30:54.594-05:00
      DOI: 10.1111/jai.13304
       
  • Anatomy of the olfactory bulb in Greenland shark Somniosus microcephalus
           (Bloch & Schneider, 1801)
    • Authors: S. Ferrando; L. Gallus, L. Ghigliotti, M. Vacchi, A. Amaroli, J. Nielsen, J. S. Christiansen, E. Pisano
      Pages: 263 - 269
      Abstract: Gross morphology and histology of the olfactory rosette of Greenland shark Somniosus microcephalus (Bloch & Schneider, 1801), suggest a well-developed olfactory capability for this top predator and scavenger native to Arctic waters. In the present paper, observations on the olfactory rosette are reported together with the gross morphology and histology of the olfactory bulb whereby the histological analyses revealed some peculiar traits. The olfactory bulb is macroscopically divided into two sub-bulbs and a central undivided part that contain the layers typical of olfactory bulb histology. The two visible sub-bulbs are actually bundles of fila olfactoria. In addition, the olfactory lateral ventricle is peculiarly branched, which may increase the ependymal surface or, alternatively, decrease the distance between the tissues of the olfactory bulb and the ventricle itself. The ependymal surface is known to be a proliferative zone in the olfactory bulb of fishes. In Greenland shark, the olfactory epithelium showed frequent mitosis and apoptosis highlighting the importance of this site in cell renewal. This issue should be pursued further to gain a deeper understanding of the sensory biology of Greenland shark and of elasmobranchs in general.
      PubDate: 2017-02-08T07:31:09.292553-05:
      DOI: 10.1111/jai.13303
       
  • Do all long supermaxilla-type estuarine tapertail anchovies (Coilia nasus
           Temminck et Schlegel, 1846) migrate anadromously'
    • Authors: T. T. Chen; T. Jiang, H. B. Liu, M. M. Li, J. Yang
      Pages: 270 - 273
      PubDate: 2017-02-08T07:30:44.713119-05:
      DOI: 10.1111/jai.13309
       
  • Occurrence and distribution of exotic fishes in the Tiber River basin
           (Umbria, central Italy)
    • Authors: A. Carosi; L. Ghetti, C. Cauzillo, L. Pompei, M. Lorenzoni
      Pages: 274 - 283
      Abstract: The purpose of this research was to analyze the abundance and distribution of four recently introduced fish species in the Tiber River basin: Gobio gobio, Luciobarbus graellsii, Rutilus rutilus, and Rhodeus sericeus. An additional aim was to evaluate the relationships of these species with environmental factors. The study area comprised 92 watercourses in the Umbrian portion of the Tiber River basin and analyzed data collected during 1990–2014, in 158 sampling sites. The results show that all four species were quickly established, with self-sustaining populations revealing invasive characteristics. In just a few years these species extended their distribution significantly in the study area; they preferentially colonized the lower reaches of rivers characterized by warmer waters and a slow current rate and were also associated with poor environmental quality conditions. The research results provide valuable information useful for risk assessment as well as for the design of proper invasive species management programs.
      PubDate: 2017-02-17T02:10:34.014331-05:
      DOI: 10.1111/jai.13302
       
  • Occurrence of Knipowitschia goerneri Ahnelt, 1991 (Gobiidae) in southern
           Albania confirmed with molecular tools
    • Authors: J. Vukić; D. Ulqini, R. Šanda
      Pages: 284 - 290
      Abstract: The aim of this work was to identify the newly discovered population of Knipowitschia from southern Albania using molecular methods. Samples were collected from the Butrint Lagoon catchment with seine nets. Mitochondrial cytochrome b and nuclear ribosomal protein gene (S7) were analyzed. A nuclear marker was used for the first time to study relationships between and among Knipowitschia species. The results show that the population from Albania belongs to Knipowitschia goerneri Ahnelt, 1991 (Corfu dwarf goby), a species previously thought to be endemic to the Korission Lagoon catchment on Kerkyra Island, Greece. Based on both mitochondrial and nuclear markers, this species was recovered in a well-supported Ionian clade also comprising Knipowitschia milleri (Ahnelt & Bianco, 1990) (Acheron spring goby) from the Acheron River and the Knipowitschia population from Trichonis Lake.
      PubDate: 2017-02-02T23:59:30.932978-05:
      DOI: 10.1111/jai.13298
       
  • Delayed effect of geomagnetic storm simulation on size, mass and activity
           of digestive glycosidases in roach (Rutilus rutilus Linnaeus, 1758)
           underyearlings
    • Authors: I. L. Golovanova; A. A. Filippov, Yu. V. Chebotareva, Yu. G. Izyumov, V. V. Krylov
      Pages: 291 - 299
      Abstract: This study aim was finding delayed consequences of the main phase impact and initial recovery period phase of a typical geomagnetic storm (MRGMS) experimentally reproduced in the range of 0–0.001 Hz on roach (Rutilus rutilus L., 1758) embryos. Roe and sperm were collected from four females and eight males caught in the Rybinsk reservoir, to achieve phenetic diversity in the resulting offspring. Mean water temperature during fertilization and embryo incubation was 18.02°C. The embryos were exposed before (1–6 hr post-fertilization) and after (33–39 hr post-fertilization) gastrulation to MRGMS with intensities of 100, 300 and 500 nT, which corresponded to the main phase and initial recovery period phase of typical moderate, strong and severe geomagnetic storms. After this exposure, body mass, standard length, mass and length of the intestine, plus activity, temperature and kinetic characteristics of digestive glycosidases were evaluated in four-month-old underyearlings (standard length 5.57–8.66 cm, body mass 3.08–12.01 g) developed from exposed embryos. Standard length and mass were lower in fish exposed to different MRGMS following gastrulation. In general, when compared to the controls, the activity of maltase was lower and activity of sucrase higher in fish exposed to different MRGMS before and after gastrulation. Maximal differences between experimental and control groups were caused by an impact of the simulation that corresponded to a moderate geomagnetic storm. After the influence of studied simulations was introduced, adaptive changes in digestive glycosidases were revealed, including an increase of enzymes affinity for the substrate, an enlargement of maltase temperature optimum and a decrease of maltase Eact in the range of environmental temperatures. The magnitude and direction of observed effects depended on the MRGM intensity and the time intervals in embryogenesis when the exposures were carried out.
      PubDate: 2017-02-08T07:31:15.043175-05:
      DOI: 10.1111/jai.13290
       
  • Nitrite toxicity in juvenile Goodeinae fishes Skiffia multipunctata
           (Pellegrin, 1901) and Goodea atripinnis (Jordan, 1880)
    • Authors: R. A. Rueda-Jasso; A. De los Santos-Bailón, A. Campos-Mendoza
      Pages: 300 - 305
      Abstract: Lethal concentration (LC50) and sub-lethal effects of NO2-N on the endemic viviparous fishes Skiffia multipunctata (Pellegrin, 1911) (SM; considered threatened under Mexican regulations) and Goodea atripinnis (Jordan, 1880) (GA; without conservation status) were determined. LC50/96 hr values were 0.002 and 0.359 mg NO2-N/L for SM and GA, respectively. Sub-lethal exposure resulted in swelling of the gill epithelium, hyperplasia, fusion of the primary and secondary lamellae, erythrocyte pyknosis, and aneurysms with respiratory stress responses at 0.0012 and 0.244 mg NO2-N/L for SM and GA. The study demonstrates that sensitivity of both species is strongly related to the conservation status and acceptable nitrite concentrations, which are clearly below those permitted by the Mexican national water quality norm for wildlife preservation. Therefore, this norm is not adequate protection for these species, and where other threatened species may also be affected. Adequate criteria for nitrites in Mexican waters should include the data of all threatened endemic species.
      PubDate: 2017-02-16T05:35:36.379536-05:
      DOI: 10.1111/jai.13292
       
  • Differences in spatial communities of European perch (Perca fluviatilis
           Linnaeus, 1758) fry in a canyon-shaped reservoir are not attributable to
           genetics
    • Authors: L. Kalous; P. Kuříková, J. Kohout, K. Rylková, M. Petrtýl, M. Čech
      Pages: 306 - 313
      Abstract: The question was whether a canyon-shaped reservoir is inhabited by genetically distinct populations of European perch Perca fluviatilis exhibiting different spatial behaviour, or by a single population. The study was conducted in the spring of 2006 at Římov Reservoir, Czech Republic. Epipelagic and bathypelagic perch fry (EPF and BPF) were captured by trawl net (mesh size 1 × 1.35 mm) controlled by echo sounder, and littoral perch fry and adults (LPF and LPA) were caught by electrofishing and beach seine (mesh size 1 × 1.35 mm). DNA was isolated in 266 individuals from the reservoir, and phylogenetic analysis based on mtDNA was performed (n = 18) on BPF, EPF, LPF, and LPA from the reservoir and additional sequences from Central Europe. Six microsatellites were used for differentiating among communities (n = 266). There was no evidence for genetic divergence in mtDNA sequences. Analyses of microsatellites revealed no statistically significant variations between spatial communities, and confirmed genetic homogeneity among communities. FST values and the number of genetic clusters point to the same conclusion, i.e., the reservoir is inhabited by a single population whose individuals occupy different microhabitats.
      PubDate: 2017-02-08T07:30:42.403208-05:
      DOI: 10.1111/jai.13305
       
 
 
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