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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  [1605 journals]
  • 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
      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
  • 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
      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
  • Morphometric relationships for four Scombridae fish species in Australian
    • 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
  • Length–weight relationships, sex ratio and growth estimates for five
           sympatric sillaginids (Pisces) from the northern Arabian Sea coast
    • Authors: S. K. Panhwar; N. Qamar, M. Mairaj, W. Shaikh, N. Habib, N. Farooq, Z.-Q. Han, T.-X. Gao
      Abstract: Five species were collected (n = sample sizes in parentheses): Sillago arabica (8), S. attenuata (26), S. indica (971), S. sihama (77) and Sillaginopodys chondropus (18) from the northern Arabian Sea coast of Pakistan. Specimens were caught with gill nets (mesh size 2.5 cm knot-to-knot) by medium-sized commercial fishing vessels from September 2015 to April 2016. The parameter slope (b) in the length–weight relationships ranged from 2.44−3.21 for sexes grouped. Sex ratios were male-biased in all species and deviated from an ideal 1:1 sex ratio. Applying the von Bertalanffy function growth coefficient, reasonable growth (K = 0.890 year−1) was estimated for Sillago sihama, whereas this was slower in S. attenuata (0.24 year−1). Goodness of fit range was Rn = 0.32–1.0. This study provides a new reference for LWRs in three of the species (S. arabica, S. attenuata, and S. chondropus), with a new maximum total length for S. indica to add to FishBase. The data presented here on the five sillaginid species can be useful for local management and conservation of these species.
      PubDate: 2017-02-10T05:55:27.308703-05:
      DOI: 10.1111/jai.13287
  • Delayed effect of geomagnetic storm simulation on size, mass and activity
           of digestive glycosidases in roach (Rutilus rutilus Linnaeus, 1758)
    • Authors: I. L. Golovanova; A. A. Filippov, Yu. V. Chebotareva, Yu. G. Izyumov, V. V. Krylov
      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
  • Reproductive biology of the migratory freshwater fish Salminus
           brasiliensis (Cuvier, 1816) in the Cuiabá River basin, Brazil
    • Authors: E. Barzotto; L. Mateus
      Abstract: This study provides information on the reproductive biology of the dorado Salminus brasiliensis from the Cuiabá River basin, through determinating life history trajectories (length at first maturity, fecundity and spawning type) and the reproductive period, thus establishing the relationships between biotic factors and rainfall and river levels that might act as potential triggers for maturation and spawning. Salminus brasiliensis is a migratory species of great commercial and ecological importance. Individuals were collected monthly from August 2013 to July 2014 in the Cuiabá River. Analyses were performed based on biometric data and the gonads. Females attained greater lengths than males in the Cuiabá River basin, and with a significant difference in the sex ratio in favor of females. Peak reproductive activity occurred in November and December and was related to rainfall. Reproduction was seasonal, with spawning and reproductive potential correlating positively with the length and mass of the gonads of mature females. Average length at first maturity for females was estimated at 55 cm. A regular (annual) monitoring programme of essential biological variables to support a trend analysis over years (not just a snapshot study, as this one) is strongly recommended in order to give advice for the proper fishing policies in the region, as without regular basic data on the population dynamics, management is not possible.
      PubDate: 2017-02-08T07:31:12.949944-05:
      DOI: 10.1111/jai.13262
  • Length–weight relationships of 15 fish species from the Lower
           Uruguay freshwater ecoregion
    • Authors: G. Eguren; L. Carrasco-Letelier
      Abstract: This work is the first report on length–weight relationships for 15 fish species from the Lower Uruguay freshwater ecoregion. Fishes were collected between 2008 and 2010 in eight streams (Cañada del Sauce, San Luis, Don Esteban Chico and Grande, de la Palmita, Lencina, del Sauce and del Totoral), all tributaries to the Negro River (Uruguay). A standardized fishing effort (50 electric pulses along 100 m) with an electrofishing device (Type IG600T, Hans Grassl GmbH, Schönau am Königssee, Germany) was conducted in each wadeable stream reach. New maximal standard lengths and total weight are given for five and 13 fish species, respectively.
      PubDate: 2017-02-08T07:31:10.232636-05:
      DOI: 10.1111/jai.13263
  • 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
      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
  • 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
      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
  • 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
      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
  • 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
      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
  • 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
      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
  • 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
      PubDate: 2017-02-08T07:30:44.713119-05:
      DOI: 10.1111/jai.13309
  • Differences in spatial communities of European perch (Perca fluviatilis
           Linnaeus, 1758) fry in a canyon-shaped reservoir are not attributable to
    • Authors: L. Kalous; P. Kuříková, J. Kohout, K. Rylková, M. Petrtýl, M. Čech
      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
  • 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
      PubDate: 2017-02-07T05:56:06.655876-05:
      DOI: 10.1111/jai.13300
  • 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
      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
    • Authors: F. A. Daros; H. L. Spach, A. T. Correia
      PubDate: 2017-02-06T05:55:50.191894-05:
      DOI: 10.1111/jai.13308
  • 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
      PubDate: 2017-02-06T02:45:26.543986-05:
      DOI: 10.1111/jai.13293
  • Fatty acid profiles of the topmouth culter (Culter alburnus Basilewsky,
           1855) from five lakes located at different latitudes in China
    • Authors: H. R. Fan; E. García-Berthou, Z. J. Li, T. L. Zhang, S. W. Ye, J. S. Liu, S. S. De Silva
      Abstract: The topmouth culter (Culter alburnus Basilewsky, 1855) is a freshwater carnivorous fish of high nutritional value and widely distributed in lakes and reservoirs of China. In order to evaluate the fatty acid profiles in relation to habitat characteristics and to elucidate the main composition predictors, C. alburnus were collected from five lakes (Xingkai- LXk, Hongze- LHz, Kuilei- LKl, Chidong- LCd and Dongting- LDt) in China, ranging in latitudes from 28°30′ to 44°44′N and altitudes from 4 to 64 m. Ten fish from each lake ranging in total lengths from 414.2 to 423.9 mm were sampled between May to June in 2013 and 2014. A total of 23 fatty acids were identified using gas chromatography. Fatty acids that predominated in muscle samples of the fish were 16:0, 18:0, 16:1n−7, 18:1n−9, 20:5n−3, 22:6n−3 and 20:4n−6. Important differences in the fatty acid profiles of fish from high and low latitude lakes were discernible in that the two high latitudinal lakes (LXk and LHz) had significantly higher (p 
      PubDate: 2017-02-03T23:20:26.6602-05:00
      DOI: 10.1111/jai.13286
  • Dynamics of sex reversal in the marbled swamp eel (Synbranchus marmoratus
           Bloch, 1795), a diandric hermaphrodite from Marechal Dutra Reservoir,
           northeastern Brazil
    • Authors: N. H. C. Barros; A. A. Souza, E. B. Peebles, S. Chellappa
      Abstract: This study characterizes the dynamics of sex reversal in the marbled swamp eel, Synbranchus marmoratus (Osteichthyes: Synbranchidae), a diandric hermaphrodite, within the context of managing species with complex sex allocations. Monthly sampling in Marechal Dutra Reservoir, northeastern Brazil, was conducted using metal eel traps from July, 2013, to June, 2014, during which a total of 288 individuals were captured. Morphological and histological comparisons of gonads identified four sex types: primary males (n = 18), females (n = 197), transitional individuals (n = 30), and secondary males (n = 43). Primary males were smallest, ranging 18–32 cm total length. Females were numerically dominant throughout the 1-year sampling period, and ranged 20–60 cm. Transitional individuals ranged 32–60 cm, and secondary males ranged 46–74 cm. The otolith-based age of 52 specimens ranged 0.5 to 5+ year. Primary males were only observed at ages 0.5 and 1, and transitional individuals were only observed at ages 3 and 4 during the female-to-secondary-male transition, supporting the existence of two types of individuals: gonochoristic males and protogynous hermaphrodites. This observation was further supported by histological observations of deteriorating ovarian tissue in transitional individuals. Given the length of time required for individuals to attain secondary male status, this species appears to be particularly vulnerable to over-exploitation. Comparisons with results from other studies suggest sex allocations and adult size distributions vary substantially within this species’ range, adding complexity to management efforts.
      PubDate: 2017-02-02T23:59:36.255803-05:
      DOI: 10.1111/jai.13273
  • Occurrence of Knipowitschia goerneri Ahnelt, 1991 (Gobiidae) in southern
           Albania confirmed with molecular tools
    • Authors: J. Vukić; D. Ulqini, R. Šanda
      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
  • Exploring the molecular diversity of Eleotridae (Gobiiformes) using
           mitochondrial DNA
    • Authors: A. Guimarães-Costa; M. Vallinoto, T. Giarrizzo, A. Angulo, G. Ruiz-Campos, H. Schneider, I. Sampaio
      Abstract: Species with wide geographic distributions can consist of different lineages or even of different species. The present study evaluated the molecular diversity of the family Eleotridae by analyzing sequences of the COI gene from species collected in different locations in a Neotropical region as well as sequences from BOLD and GenBank. The analysis revealed the distinction and differentiation of a variety of species with high statistical support, including Gobiomorus dormitor (two lineages), Dormitator maculatus (three lineages) and Eleotris fusca (three lineages), and a number of different lineages of Microphilypnus. This indicates the existence of a number of unknown cryptic species that have not been reported previously, increasing the potential diversity of eleotrid species in the Neotropics.
      PubDate: 2017-01-30T02:17:02.881643-05:
      DOI: 10.1111/jai.13266
  • Length–weight relationships for seven fish species from Marajó Bay,
           Amazon estuary, northern Brazil
    • Authors: S. N. Loureiro; M. Mourão Júnior, T. Giarrizzo
      Abstract: Length–weight relationships (LWR) were estimated for seven fish species inhabiting the intertidal mudflats in the Marajó Bay, northern Brazil. A total of 514 specimens were collected quarterly between November 1994 and December 1995 using a beach seine (5 mm mesh size between opposite knots). Slope b of the LWR varied between 2.93 and 3.11, with a mean of 3.02. This study represents the first reference on LWRs for seven species and a new maximum length record for one of these species.
      PubDate: 2017-01-30T02:16:58.344321-05:
      DOI: 10.1111/jai.13281
  • 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
      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
  • An evaluation of elastomer and coded wire tag performance in juvenile
           Tibet fish Oxygymnocypris stewartii (Lloyd, 1908) under laboratory
    • Authors: T. B. Zhu; M. Y. Gan, X. G. Wang, L. Chen, Y. F. He, D. G. Yang
      Abstract: A 95-day experiment was conducted to evaluate the performance of a visible implant elastomer tag (VIE) versus a coded wire tag (CWT) implanted in juvenile Tibet fish Oxygymnocypris stewartii (Lloyd, 1908; total length 5~7 cm) under laboratory conditions. Mortality, tag retention and growth in three groups of juvenile O. stewartii (VIE-tagged, CWT-tagged and control) in duplicate were determined in six indoor tanks (300-L/tank volume, 100 fish/tank) at 15.6 ± 0.5°C water temperature. Results showed that neither tagging method had a significant difference on the mortality of the experimental fish, but that the growth rate in the VIE group was significantly lower than in the CWT and control groups. Mean tag retention in the VIE group was 95.2%, and 98.9% in the CWT group, with no significant differences in tag retention in the two methods. The study indicates that both VIE and CWT are suitable short-term tagging methods for hatchery O. stewartii juveniles.
      PubDate: 2017-01-30T02:16:48.684991-05:
      DOI: 10.1111/jai.13288
  • Length–weight and length–length relationships for nine species of the
           genus Paracobitis (Nemacheiliidae) in Iran
    • Authors: H. Mousavi-Sabet; A. Heidari, S. Vatandoust
      Abstract: Length–weight (LWR) and length–length (LLR) relationships were estimated for 330 specimens from nine Paracobitis species in 11 localities throughout Iran. All fish were collected upon occasion by electrofishing throughout Iran from July 2010 to October 2016. These represent the first reports of LWR data for eight species including: Paracobitis atrakensis, P. hircanica, P. longicauda, P. molavii, P. persa, P. rhadinaeus, P. smithi and P. vignai and first LLR data for all species. A new maximum length is reported for P. malapterura. Four of these species are endemic and five species are native to Iran. The length–weight parameter b ranged from a minimum of 2.74 for P. atrakensis to a maximum of 3.01 for P. longicauda, with regression coefficients (r2) ranging from 0.96 to 0.99. All LLRs were highly significant (r2 > .96).
      PubDate: 2017-01-30T02:16:42.825451-05:
      DOI: 10.1111/jai.13278
  • Difference in age, growth, and sexual demography of black-spot tuskfish,
           Choerodon schoenleinii (Valenciennes, 1839), in two adjacent populations,
           Ryukyu Archipelago, southern Japan
    • Authors: Y. Akita; A. Ebisawa, N. Hirai, K. Asami, I. Ohta, M. Uehara, K. Teruya, H. Yamada, M. Kobayashi, T. Sato, K. Okuzawa
      Abstract: To better understand the plasticity of life history traits in the blackspot tuskfish, Choerodon schoenleinii (Valenciennes, 1839), the characteristics of the population around the Yaeyama Islands (24°N, 124E) were examined and compared to those around Okinawajima Island (26°N, 128E) that had been investigated in a previous study. Age and growth of the Yaeyama population were examined based on 103 specimens collected at fish markets between 2006 and 2016. Specimens included 83 females (25.2–69.0 cm total length [TL]), and 20 males (43.1–71.8 cm TL). Ages determined from sectioned otoliths ranged from 1–9 for females, and 4–15 for males. Values for von Bertalanffy growth functions were Lt = 74.2 {1−exp[−0.23 (t + 0.38)]}, and the growth of the Yaeyama population was significantly faster than that of the previously studied population. Sexual demography of the two populations was compared using body length data on landings measured at the fish markets. In the Yaeyama population, females and males ranged from 24–65 cm TL and 39–75 cm TL, respectively; length at 50% individual sex change size was estimated at 54.7 ± 0.56 cm (±95% C.I.). In contrast, in the Okinawajima population, females and males ranged from 16–65 cm TL and 30–75 cm TL, respectively; meanwhile, 50% sex change size was estimated to be 50.0 ± 0.25 cm. There were thus significant differences in the size at sex change between the two populations. This difference may be related to the difference in population density between the sites.
      PubDate: 2017-01-30T02:16:38.367538-05:
      DOI: 10.1111/jai.13270
  • Length–weight and length–length relationships for 11 species of the
           genus Alburnoides Jeitteles, 1861 (Cyprinidae) from Iran
    • Authors: H. Mousavi-Sabet; A. Heidari, S. Vatandoust
      Abstract: Length–weight (LWR) and length–length (LLR) relationships were estimated for 11 Alburnoides species from 15 localities throughout Iran. These represent the first reports of LWR and LLRs data for 10 species, including: Alburnoides coadi (40 specimens), A. damghani (30), A. eichwaldii (110), A. holciki (30), A. idigensis (113), A. namaki (30), A. nicolausi (30), A. parhami (30), A. qanati (30) and A. tabarestanensis (30) and first LLR data for A. samiii. Nine of these species are endemic and two are native to Iran. The length–weight parameter b for these species ranged from a minimum of 2.94 for Alburnoides nicolausi to a maximum of 3.37 for Alburnoides parhami, with regression coefficients (r2) ranging from 0.91 to 0.99. All LLRs were highly significant (r2 > 0.96).
      PubDate: 2017-01-30T02:15:44.136462-05:
      DOI: 10.1111/jai.13271
  • Length–weight relationships of four fish species from the Niulan
           River, China
    • Authors: D. F. Zhang; W. Wang, Q. F. Liu
      Abstract: This study provides the length–weight relationships (LWRs) for four fish species [Leptobotia rubrilabris (Dabry de Thiersant, 1872); Opsariichthys bidens Günther, 1873; Xenocypris yunnanensis Nichols, 1925; and Sinogastromyzon sichangensis Chang, 1944] collected from the Niulan River, China. Samples were obtained between April 2008 and June 2011 using various types of fishing gear [drift gill nets (mesh: 5 × 5 cm), hook and electro fishing]. A total of 136 specimens belonging to four fish species were analyzed. For each species the sample size, length range, weight range, LWR, 95% confidence intervals of a and b, and coefficient of correlation were determined. Prior to this study, the LWRs for S. sichangensis and X. yunnanensis were unknown. New maximum sizes for S. sichangensis and X. yunnanensis are also provided.
      PubDate: 2017-01-24T00:56:28.89702-05:0
      DOI: 10.1111/jai.13254
  • Length–weight relationships for four stingray species from the
           tropical Atlantic Ocean
    • Authors: E. C. Teixeira; V. E. L. Silva, N. N. Fabré, V. S. Batista
      Abstract: This study provides separate length–weight relationships (LWRs) for males, females and pooled individuals for four stingray species (Dasyatis guttata, Dasyatis marianae, Gymnura micrura, and Rhinoptera bonasus) found in the tropical Atlantic. The specimens were sampled monthly between April 2009 and February 2011 along the coast of Alagoas, northeastern Brazil, using different fishing gear. For three species, the LWR parameters are reported for the first time, including D. marianae, an endemic species.
      PubDate: 2017-01-24T00:56:27.842924-05:
      DOI: 10.1111/jai.13255
  • Estimates on age, growth and mortality of the French angelfish Pomacanthus
           paru (Bloch, 1787) (Teleostei: Pomacanthidae) in the southwestern Atlantic
    • Authors: C. V. Feitosa; M. E. Araújo, B. P. Ferreira
      Abstract: The aim of the present study was to determine age, growth and mortality of the French angelfish Pomacanthus paru. Age was solely determined by sectioned otoliths. All tetracycline-treated otoliths were 1 year of age and revealed a clear fluorescent mark when observed under UV light. Otolith weight increased exponentially with standard length, and linearly with age, indicating that otolith growth continues with age and is independent of size. Age of fish in the sample ranged from 1 to 27 years. The von Bertalanffy growth equation was TLt = 36.33 (1 − e−0.12 (t + 0)). Total rate mortality (Z) was estimated to be 0.10. Attaining maximal size slowly, P. paru has a long life expectancy. Most linear growth is achieved within approximately 74% of the lifetime of the fish. Besides being an important ornamental species, P. paru has been commonly captured for decades as bycatch in trap fisheries. These growth parameters should be used with the purpose of managing fisheries targeting this species before more meaningful limits can be imposed. In the aquarium trade management, it is suggested that conservationist issues should be based on capture-per-area and the establishment of protected areas.
      PubDate: 2017-01-24T00:56:25.650977-05:
      DOI: 10.1111/jai.13246
  • Does a diet including pellets from salmon cage farms affect the taste of
           wild saithe (Pollachius virens Linnaeus, 1758)'
    • Authors: I. Uglem; E. M. Ulvan, K. Toledo-Guedes, E. Hegstad, S. Blakstad, B. Buserud, B.-S. Sæther
      PubDate: 2017-01-24T00:56:18.398202-05:
      DOI: 10.1111/jai.13261
  • Length–weight relationships of 19 freshwater fishes from the Upo
           Wetland in South Korea
    • Authors: D.-K. Kim; H. Jo, J.-D. Yoon, J.-H. Kim, M.-H. Jang, G.-J. Joo, J.-S. Gim
      Abstract: The length–weight relationships (LWRs) for 19 freshwater fish species in Upo Wetland, South Korea, were analyzed. Fish samples were collected quarterly using scoop-nets (5 mm mesh), casting nets (7 mm mesh) and a fixed shore net (15 mm mesh) from 2007 to 2014. LWRs data for three species have not yet been listed in FishBase.
      PubDate: 2017-01-24T00:56:17.391249-05:
      DOI: 10.1111/jai.13253
  • Combined gut-content and stable isotope trophic analysis of the pelagic
           stingray Pteroplaytrygon violacea (Bonaparte, 1832) diet from the western
           North Atlantic Ocean
    • Authors: T. A. Weidner; A. C. Hirons, A. Leavitt, D. W. Kerstetter
      Abstract: The understanding of trophic relationships is vital for correctly modeling ecosystems and ecosystem effects of fisheries removals. The pelagic stingray is found in epipelagic sub-tropical and tropical waters worldwide and is a common bycatch in pelagic longline fisheries. Between August 2008 and November 2011, 156 specimens (81 males; 75 females) were collected during pelagic longline fishing operations in the US South Atlantic Bight and Gulf of Mexico. Stomach content analyses found that the major prey items were cephalopod molluscs (59.18%), followed by actinopterygiian fishes (37.75%), and decapod crustaceans (35.71%). These concentrations of prey items found in the stomachs coincide with previous studies done in the Pacific Ocean. In contrast to previous studies that found high percentages of empty stomachs (63%), the current percentage of empty stomachs was much lower (25.6%), likely due to shorter times between collection and inspection. Stable isotope analysis (δ13C and δ15N) was performed on white muscle in order to correlate the trophic position with gut-content analysis. The δ13C values ranged from -18.81‰ to -16.70‰, while the δ15N ranged from 6.11‰ to 11.88‰. Modeling of stable isotope data suggest that while squid are occasionally an important part of the pelagic stingray diet, prey usually consist of shrimp and other pelagic crustaceans. Pelagic stingrays fed within two trophic levels, but their prey appeared to feed on different carbon sources than those found in other pelagic elasmobranchs. A deeper understanding of the pelagic stingray diet sources can help fisheries management as it begins to transition into ecosystem-based management.
      PubDate: 2017-01-24T00:56:13.847926-05:
      DOI: 10.1111/jai.13259
  • Effects of chitosan-oligosaccharides on growth performance, digestive
           enzyme and intestinal bacterial flora of tiger puffer (Takifugu rubripes
           Temminck et Schlegel, 1850)
    • Authors: P. Su; Y. Han, C. Jiang, Y. Ma, J. Pan, S. Liu, T. Zhang
      Abstract: The present study was conducted to evaluate the effects of different dietary chitosan oligosaccharide (COS) levels on digestive enzyme activity, intestinal bacteria flora, and growth performance of the tiger puffer (Takifugu rubripes). Some 600 fish (initial body weight 129.2 ± 3.1 g) were randomly allocated into twelve 2,000-L blue cylinder aquaria with 1,500-L of sea water and divided into four groups (n = 3 aquaria/diet). The fish were fed experimental diets supplemented with different levels of COS (0% [control, L1], 0.05% [LC1], 0.1% [LC2], and 0.2% [LC3]) for 8 weeks. During the experiment, the water temperature was 18 ± 1°C, salinity 28 ± 0.1, pH 8.0 ± 0.1 (mean ± SD, n = 672); airstones were positioned at the bottom of the tank, dissolved oxygen content was above 7.0 mg/L, with a photoperiod of 12 hr light: 12 hr dark. The results showed that dietary COS significantly increased growth performance, intestinal-somatic index (ISI), and intestinal protease as well as lipase activity (p  .05). High-throughput sequencing analysis showed that COS affected the richness and diversity of intestinal microbial species. The Shannon index of intestinal bacterial flora was significantly higher in the control group than in other groups (p 
      PubDate: 2017-01-17T04:45:39.601343-05:
      DOI: 10.1111/jai.13282
  • Ovarian development and changes in the expression of pituitary
           gonadotropin subunits during the reproductive cycle of female Malaysian
           river catfish, Hemibagrus nemurus (Valenciennes, 1840), in captivity
    • Authors: Z. Zulperi; A. Christianus, F. M. Yusoff, S. A. Harmin, M. Y. Ina-Salwany
      Abstract: Determining the expression level of genes encoding the subunit gonadotropic hormones is critical in understanding the reproductive cycle and gonadal development in fish species. The objectives of this study were to monitor changes in the mRNA expression of three gonadotropin (GtH) subunits (α, FSHβ, and LHβ) during gonadal development of the female Malaysian river catfish, Hemibagrus nemurus, in captivity. In the study a quantitative real-time PCR approach was developed to assess these three mRNA transcript GtH subunit profiles and compare them with ovarian development. The number of transcript encoding GtH hormone, α, FSHβ, and LHβ subunits in pituitary glands of female H. nemurus was measured throughout the reproductive cycle from August 2013 to October 2015, with fish aged 1–27 months. The mRNA expression of GtH subunits increased with ovarian development throughout the reproductive cycle. The FSHβ mRNA level increased during ovarian development, reached its peak in mid-vitellogenesis, and was reduced during ovulation and spawning, whereas the LHβ mRNA level significantly increased in late vitellogenesis and reached its peak during the ovulation and spawning season (April–May). In α subunit, the mRNA level corresponded to FSHβ and LHβ, with a peak expression during ovulation. The findings suggest that FSH was strongly activated during vitellogenesis, whereas LH was involved at the end of gonadal development process, during ovulation, and in the final oocyte maturation.
      PubDate: 2017-01-16T01:25:28.078541-05:
      DOI: 10.1111/jai.13267
  • Length–weight relationships of three small indigenous fish species from
           the Lower Brahmaputra, India
    • Authors: S. Basumatary; H. Choudhury, B. Talukdar, H. K. Kalita, D. Sarma
      Abstract: Length–weight relationships (LWRs) for three small indigenous fish species from the lower Brahmaputra in Assam, India: Glyptothorax telchitta, Nangra assamensis, and Gudusia chapra were studied on a monthly basis from February 2015 to January 2016. Various fishing gear types were employed: cast nets (9′ ½”), gillnets (30 × 0.9 m, 0.5″; 60 × 3 m, 1.5″) and mosquito nets (20 × 6 m, 0.04″). No previous reference is available on LWR data for two of these species.
      PubDate: 2017-01-11T06:25:24.201817-05:
      DOI: 10.1111/jai.13274
  • Citric acid as a feed additive in pacu Piaractus mesopotamicus (Holmberg,
           1887) diets
    • Authors: H. Hisano; M. S. S. Sanchez, M. S. Nascimento
      Abstract: The objective of this study was to evaluate citric acid (0.0, 1.0, 2.0 and 3.0%) in isonitrogenous (23% of digestible protein) and isoenergetic (13.38 MJ of digestible energy/kg) pacu Piaractus mesopotamicus (Holmberg, 1887) diets. A 90-day feeding trial was conducted to evaluate the growth performance, haematological parameters and pH of the diets, stomach and gut, somatic indices, nitrogen retention and body composition of pacu juveniles. Fish (n = 160, 12.53 ± 0.17g) were distributed in 16 aquaria (300-L) with a recirculating water system (4 L/min) and controlled temperature (25.26 ± 0.47°C) in an experimental design completely randomized with four treatments and four replicates. Posteriorly, apparent digestibility coefficients (ADC) were assessed with pacu (n = 96, 80.35 ± 5.12 g) fed experimental diets including 0.1% chromium oxide III. Diet pH decreased (p 
      PubDate: 2017-01-11T06:25:21.537308-05:
      DOI: 10.1111/jai.13289
  • Seasonal niche segregation of two sympatric xenocyprinid fishes
    • Authors: M. H. Hu; Q. G. Liu, J. D. Zhang, R. Xiao, Y. J. Wang
      Abstract: Xenocypris microlepis (Bleeker, 1871) and Xenocypris davidi (Bleeker, 1871) are two closely related xenocyprinid species potentially subject to exploitative competition. They often coexist in many freshwater ecosystems, which offers an opportunity to analyze their relationships. The present study describes the seasonal feeding habits of age-3 X. microlepis and X. davidi in Xin'anjiang Reservoir, located in Zhejiang, China, as determined by stable isotope analysis. Particulate organic matter (POM; 50%) and periphyton (50%) were the major items observed in the X. microlepis diet, whereas periphyton (>60%) was prevalent in the X. davidi diet. Seasonal variations were observed in the diet compositions of both xenocyprinid species. Whereas X. microlepis tended to ingest more sediment organic matter (SOM) in autumn than in spring and summer, SOM was the secondary food item for X. davidi over the three seasons. The seasonal diet shift observed in this work indicates niche segregation of the sympatric pair. The results of this study contribute to the current knowledge of seasonal trophic interactions in predator–prey systems where sympatric xenocyprinids are present.
      PubDate: 2017-01-10T07:35:41.504728-05:
      DOI: 10.1111/jai.13264
  • First record of the honeycomb stingray Himantura leoparda
           (Manjaji-Matsumoto & Last, 2008) (Myliobatoidei: Dasyatidae) in the
           Mediterranean Sea, confirmed by DNA barcoding
    • Authors: N. Yucel; A. Sakalli, A. Karahan
      PubDate: 2017-01-10T07:35:39.190098-05:
      DOI: 10.1111/jai.13283
  • Length–weight and length–length relationships for seven fish species
           from the Zohreh River, Iran
    • Authors: Y. Keivany; M. Zamani-Faradonbe
      Abstract: Length–weight and length–length parameters were calculated for seven fish species belonging to five families in the Zohreh River, Iran. The weight–length relationships were estimated using the equation W = aLb. The b values varied between 2.72 and 3.33, with a mean ± SD of 2.88 ± 0.28. The b values parameter in the length–weight relationship equations were calculated as 3.15 for Alburnus mossulensis Heckel, 1843; 3.78 for Barilius mesopotamicus Berg, 1932; 2.86 for Cyprinion macrostomum Heckel, 1843; 2.89 for Nuchequula gerreoides (Bleeker, 1851); 2.80 for Mastacembelus mastacembelus (Banks & Solander, 1794); 2.72 for Liza abu (Heckel, 1843); and 3.19 for Paraschistura nielseni (Nalbant and Bianco, 1998). This study presents the first LWR and LLR references for these species in the Zohreh River.
      PubDate: 2017-01-10T07:35:33.323406-05:
      DOI: 10.1111/jai.13285
  • First record of the buccaneer anchovy Encrasicholina punctifer (Fowler,
           1938) (Clupeiformes; Engraulidae) in the Mediterranean Sea, confirmed
           through DNA barcoding
    • Authors: O. Çiftçi; A. Karahan, Y. AK Orek, A. E. Kideys
      PubDate: 2017-01-10T07:35:32.472087-05:
      DOI: 10.1111/jai.13276
  • Occurrence of Misgurnus anguillicaudatus (Cantor, 1842) (Cobitidae) in the
           Taquari River, Upper Paraná Basin, Brazil
    • Authors: A. B. Nobile; D. Freitas-Souza, F. P. Lima, I. L. Bayona Perez, S. G. C. Britto, I. P. Ramos
      PubDate: 2017-01-10T07:35:26.007202-05:
      DOI: 10.1111/jai.13279
  • Length–weight relationships for 35 fish species of the Atlantic
           Forest, SP/RJ—Brazil
    • Authors: F. P. Lima; A. B. Nobile, D. Freitas Souza, C. A. Siqueira, C. A. Lemos, B. Abreu-Santos, J. A. P. Santos
      Abstract: Length–weight relationships (LWRs) for 35 freshwater fish species from the SP/RJ coastal basin in Brazil are presented in this paper. Fishes were captured between 2011 and 2015 on an irregular basis using electrofishing, sieves, trawl nets, cast nets and fish-traps. In this study new LWRs are reported for 28 species, plus the total weight and length for 34 and nine species, respectively. The study provides new information on less-studied species and can serve as a basis for management and conservation in this area.
      PubDate: 2017-01-10T07:35:24.807363-05:
      DOI: 10.1111/jai.13265
  • Nutritional profile of soaked Cajanus cajan (L.) Millsp. and its
           utilization as partial replacement for soybean meal in the diet of Clarias
           gariepinus (Burchell, 1822) fingerlings
    • Authors: S. G. Solomon; V. T. Okomoda, R. E. Onah
      Abstract: This study aimed to investigate the efficacy of soaking as a cheap processing method in improving the nutritional utilization of Cajanus cajan for partial replacement of soybean meal in formulated diets of the African catfish Clarias gariepinus (Burchell, 1822). The nutrient profile of soaked C. cajan revealed a significant reduction (≤50%) in all anti-nutritional factors. Proximate and amino acids were also affected by this processing method. Six practical diets (35 g/kg crude protein, 19.1 KJ/g diet) containing substitution levels of 0, 10, 20, 30, 40 and 50% C. cajan for soybean protein (included at 578 g/kg) were then formulated and fed to triplicate groups (n = 50 in each group) of C. gariepinus fingerlings (1.41 ± 0.06 g) in a hapa pond system (1 × 1 × 1 m3) for 56 days (mean temperature 25.3 ± 0.6). The results revealed that fish survival was not significantly affected until a 40% substitution of soybean was reached. However, beyond 20% soybean substitution, growth was significantly reduced (≥7%; p ≤ .05). Fish fed the highest substitution of soaked C. cajan meal (50% soybean replacement) had the poorest performance. The cost of the compound diets was substantially reduced with the inclusion of soaked C. cajan. Production costs of 1 kg fish using the diet with an inclusion of up to 20% soaked C. cajan meal replacement were comparable to using the control diet. It was concluded that soaking C. cajan seed for 24 hr improved the nutritional profile of the ingredients to replace 20% of the soybean (included at 57.8%) protein in the diet of C. gariepinus with no negative effect on growth and nutrient utilization.
      PubDate: 2017-01-10T07:35:23.640195-05:
      DOI: 10.1111/jai.13280
  • Length-weight relationships of insular cichlids from Patos Lagoon estuary,
           subtropical Brazil
    • Authors: F. M. Quintela; P. E. Rubira Pereyra, F. Corrêa, D. Loebmann
      Abstract: The present study reports the length-weight relationships (LWRs) of three cichlids (Crenicichla lepidota, Cichlasoma portalegrense and Geophagus brasiliensis) collected in a system of pools of the largest estuarine island of Patos lagoon, southern Brazil. Fishes were sampled during random field trips performed from April 2015 to April 2016, using a beach seine (net 5 × 2 m; mesh size 5 mm) and a hand net (diameter 45 cm, mesh size 2 mm). The LWRs for C. portalegrense are presented herein for the first time.
      PubDate: 2017-01-10T07:35:22.134535-05:
      DOI: 10.1111/jai.13284
  • Cross-effects of dietary probiotic supplementation and rearing temperature
           on antioxidant responses in European seabass [Dicentrarchus labrax
           (Linnaeus, 1758)] juveniles
    • Authors: L. F. Pereira; J. F. M. Gonçalves, M. J. Peixoto, A. Domingues, S. B. Fonseca, F. A. Magalhães, G. A. Santos, R. O. A. Ozorio
      Abstract: Temperature modulates the metabolism in both fish and bacteria and therefore the effect of probiotic bacteria on its host may vary accordingly. The current study aim was to evaluate the effect of probiotic supplementation (Bacillus sp., Lactobacillus sp., Enterococcus sp., Pediococcus sp.) in juvenile seabass, Dicentrarchus labrax, when reared under different temperatures (17, 20 and 23°C). A control diet was tested against a probiotic-supplemented diet, with a concentration of 3 × 109 CFU probiotic/kg diet. Antioxidant responses (TG, GSH, GSSG, GR, CAT and GSTs) and lipid peroxidation (LPO) were evaluated after 70 days of dietary probiotic supplementation. An effect of temperature was observed on LPO, which increased significantly in fish reared at 17°C (p 
      PubDate: 2017-01-07T01:00:36.699137-05:
      DOI: 10.1111/jai.13256
  • Length–weight relationships of Barilius bendelisis (Hamilton, 1807),
           Barilius shacra (Hamilton, 1822) and Barilius barna (Hamilton, 1822) from
           Manas River in Assam, India
    • Authors: F. Jabeen; H. Choudhury, D. Sarma
      Abstract: The present study describes the length–weight relationships (LWRs) for three ornamental hill stream fish species from the Manas River in Assam, India, namely, Barilius bendelisis (Hamilton, 1807), Barilius shacra (Hamilton, 1822), and Barilius barna (Hamilton, 1822). Fishes were collected on a monthly basis from March 2015 to February 2016 with cast nets (270 cm, 1.2 cm) and gillnets (7,500 × 130 cm, 5 cm). This is the first information on LWR data for two of the species.
      PubDate: 2017-01-07T01:00:30.20342-05:0
      DOI: 10.1111/jai.13269
  • Occurrence of blunthead puffer, Sphoeroides pachygaster (Müller and
           Troschel, 1848) (Tetraodontidae) in north-eastern Aegean Sea (Izmir Bay,
    • Authors: O. Akyol; I. Aydın
      PubDate: 2017-01-07T01:00:29.170183-05:
      DOI: 10.1111/jai.13277
  • Development of 34 polynucleotide repeat microsatellites for Chinese lake
           gudgeon (Sarcocheilichthys sinensis Bleeker, 1871) by transcriptome
    • Authors: C. Zhu; Z. Pan, H. Wang, N. Wu, G. Chang, H. Ding
      Abstract: A total of 34 novel polymorphic polynucleotide repeat microsatellites were developed for Sarcocheilichthys sinensis through transcriptome sequencing. Results of polymorphism characterization in a test population showed that the number of alleles of these loci ranged from 2 to 12, averaging 5.2 alleles per locus. Observed and expected heterozygosity varied from 0.0333 to 0.9667 and from 0.0333 to 0.8825, respectively. Twenty-seven loci were proven to be highly informative because the values of their polymorphism information contents were greater than 0.5. These novel polymorphic microsatellite markers would be useful tools for further population and conservation genetic studies of S. sinensis.
      PubDate: 2017-01-07T01:00:27.990564-05:
      DOI: 10.1111/jai.13275
  • The role of temperature and daytime as indicators for the spawning
           migration of the Caspian lamprey Caspiomyzon wagneri Kessler, 1870
    • Authors: A. Abdoli; M. R. Farokhnejad, H. Nazari, B. Hassanzadeh Kiabi
      PubDate: 2017-01-02T07:25:25.774037-05:
      DOI: 10.1111/jai.13078
  • Gonadosomatic index-based size at first sexual maturity of male and female
           Amblygaster clupeoides (Bleeker, 1849) (Clupeidae) on the east coast of
           the Malaysian peninsular
    • Authors: M. M. Rahman
      Abstract: Size at first sexual maturity and condition of Amblygaster clupeoides were determined in a population at the Malaysian east coast. A total of 887 specimens were collected from commercial fishing vessels between March and November 2012. A random sample was taken each time to avoid bias in the cohort sampling. Size at first sexual maturity was determined by the relationship between the total length and gonadosomatic index (GSI). Similarly, the relationship between the condition factor and GSI was applied to determine the condition at first sexual maturity. The sex ratio was close to 1:1. The total length at first sexual maturity of both males and females were at around 18 cm. Males with a GSI of ≥3.2% and females with a GSI of ≥6.5% were mature, having condition factors of ≥0.90 and ≥0.93, respectively. Based on these results the minimum permissible capture size was identified. This study establishes a strong need for regular and continued monitoring of the changes in fish size at first sexual maturity.
      PubDate: 2017-01-02T07:25:23.725382-05:
      DOI: 10.1111/jai.13252
  • Issue Information
    • First page: 1
      PubDate: 2017-01-19T02:03:04.84515-05:0
      DOI: 10.1111/jai.13310
  • Feeding strategy of silverside species in eutrophic Lake Pátzcuaro,
    • Authors: B. E. Vital-Rodríguez; J. P. Ramírez-Herrejón, R. Moncayo-Estrada, J. Caraveo-Patiño, O. Domínguez-Domínguez
      First page: 93
      Abstract: The trophic guild, niche breadth, and trophic position of two different ontogenetic phases were measured according to the size of Chirostoma spp. captured in different zones of Lake Pátzcuaro, Mexico. Analyses were carried out at the genus level due the difficulties to find diagnostic characters to separate the three small silverside species accurately, since even the molecular analyses of mitochondrial DNA for a subsample of the most morphologically differentiated specimens were conducted without success. Fish were captured with a seine net during the wet (September and November 2009) and dry (February and June 2010) seasons at four environmentally different sites. Gut contents of 480 Chirostoma specimens were divided into size-class intervals of 38–51 mm and 66–71 mm for analyses. The contribution of each food item was quantified using the frequency of occurrence and area percentage. Fish were categorized by size, and diets were compared between fish sizes and sites. Dorsal muscle tissue and zooplankton were obtained for nitrogen isotope signature (δ15N) analyses. The trophic guild was determined using a modified quadrant method for gut content analysis; the importance of each prey item was estimated according to a modified index of relative importance. Niche breadth was calculated by the Levins’ Index. The trophic position was assessed using the TrophLab Program and stable isotope analysis. The index of relative importance among study sites and fish size classes was determined by a multivariate approach. Silversides represent a secondary and tertiary consumer in Lake Pátzcuaro that feed mainly on evasive prey, such as copepods (55%) and on non-evasive prey, such as cladocerans (25%) at sites with the lowest transparency in the water column (from 350 mm to 150 mm). Fish scales (11%) and insects (6%) were secondary food items. Ingestion of juvenile silversides was rare (1%). Chirostoma spp. prey on insects on the lake bottom and on water hyacinth roots. Based on δ15N analysis, the trophic position of silversides changes between wet and dry seasons. Their opportunistic and specialized predatory feeding strategy indicates the capability of silversides to resist anthropic changes in the lake.
      PubDate: 2017-01-19T02:03:00.153542-05:
      DOI: 10.1111/jai.13248
  • Relationships between fish size and otolith size of four bathydemersal
           fish species from the south eastern Arabian Sea, India
    • Authors: K. V. Aneesh Kumar; K. P. Deepa, M. Hashim, C. Vasu, M. Sudhakar
      First page: 102
      Abstract: The objective of this study was to estimate a prey body size from the hard parts (e.g. otoliths) of a fish species frequently found in the guts of predators. Length–weight relationships between otolith size (length, height, weight and aspect ratio) and fish size (total length and weight) were determined for four fish species captured in the Arabian Sea by bottom trawl (2015 survey on-board FORV Sagar Sampada, 200–300 m depth), off the west coast of India: Psenopsis cyanea, Pterygotrigla hemisticta, Bembrops caudimacula and Hoplostethus rubellopterus. No significant differences were noted between the size of the left and right otoliths (t test) in any of the four species. The length–weight relationship of the otolith in all four species showed a negative allometric growth pattern (t test, p 
      PubDate: 2017-01-19T02:03:02.40317-05:0
      DOI: 10.1111/jai.13250
  • Age and growth comparisons of Hovsgol grayling (Thymallus nigrescens
           Dorogostaisky, 1923), Baikal grayling (T. baicalensis Dybowski, 1874),
           and lenok (Brachymystax lenok Pallas, 1773) in lentic and lotic habitats
           of Northern Mongolia
    • Authors: P. Tsogtsaikhan; B. Mendsaikhan, G. Jargalmaa, B. Ganzorig, B. C. Weidel, C. M. Filosa, C. M. Free, T. Young, O. P. Jensen
      First page: 108
      Abstract: Despite concern over the conservation status of many Mongolian salmonids and the importance of their ecological role in Mongolia's aquatic ecosystems, little is known about their basic biology. Hovsgol grayling (Thymallus nigrescens) is endemic to Lake Hovsgol, Mongolia and listed as endangered on the Mongolian Red List. Baikal grayling (T. baicalensis) and lenok (Brachymystax lenok) are found in lakes and rivers throughout the Selenge drainage. A detailed study of the age and growth of these three salmonids was conducted based on 1,682 samples collected from July 2006 to July 2013 in Lake Hovsgol, its outlet the Eg River, and one of the Eg's largest tributaries, the Uur River. Our results suggest that Hovsgol grayling in particular can reach a much older maximum age (17 years in our samples) than previously believed based on aging from scales. Female Hovsgol grayling were heavier at a given length than their male counterparts. Lenok had a greater average length-at-age in Lake Hovsgol compared to the rivers and greater weight-at-length in the warmer Uur River than in the Eg; female lenok from the rivers had a greater average length-at-age than their male counterparts. This study provides critical new information for the management and conservation of these threatened salmonid species in Mongolia.
      PubDate: 2017-01-17T04:45:56.834744-05:
      DOI: 10.1111/jai.13247
  • Erratum
    • First page: 155
      PubDate: 2017-01-19T02:03:03.06892-05:0
      DOI: 10.1111/jai.13257
  • Trophic levels of teleost and elasmobranch species in the Persian Gulf and
           Oman Sea
    • Authors: A. R. Rastgoo; J. Navarro
      Abstract: Knowing the trophic level of marine organisms is essential to understanding their ecological role in the ecosystem and for quantifying the ecosystem effects of fishing to establish effective management of fishing resources. In comparison to other systems, information about the trophic level of marine organisms in the Persian Gulf and Oman Sea is very scarce. Here, the main aim was to estimate trophic level in these areas using all available diet information from different marine species using TrophLab software. The trophic level of 32 fish species was estimated with the available diet data. The trophic level ranged from 2.28 to 4.50. High trophic levels were found for Chorocentrus nudus (TL = 4.7), Saurida tumbil (TL = 4.6), Rhizoprionodon acutus (TL = 4.5), Torpedo sinuspersici (TL=4.5), Gymnura poecilura (TL = 4.5), Sphyraena putnamae (TL = 4.5) and Euthynnus affinis (TL = 4.5). In contrast, lower trophic levels were estimated for Tenualosa ilisha (TL = 2.28) and Sardinella sindensis (TL = 2.92). As expected, a positive correlation was found between the trophic level and body size, indicating changes in the diet due to variations in predatory capacities. The results of this study may be useful in the formulation of trophic indicators and modelling of the ecosystems.
      PubDate: 2016-12-19T02:10:23.610258-05:
      DOI: 10.1111/jai.13249
  • Length-weight relationships of five fish species in Tibet, southwest China
    • Authors: L. Li; B. Ma, C. Zhang, J. H. Gong, S. F. Wu
      Abstract: Length-weight relationships (LWR) were evaluated for five species: Schizothorax integrilabiatus (Wu et al., 1992); Shizopygopsis stoliczkai Steindachner, 1866; Gymnocypris chui Tchang, Yueh & Hwang, 1964; Gymnocypris scleracanthus Tsao, Wu, Chen & Zhu, 1992; and Triplophysa tibetana (Regan, 1905). A total of 567 specimens were collected whereby S. integrilabiatus was caught with 12-volt electric fishing gear (water depth, 1 m) in Buqun Lake in May 2015. Both G. chui and G. scleracantus were caught with 12-volt electric fishing gear (water depth,1 m) and set gillnets (mesh size 3 cm) in Lange Lake in July 2015, S. stoliczkhai was caught with 3 cm mesh size set gillnets in Shiquan River in August 2015, T. tibetana was caught with 12 V electric fishing gear in the Zhongba reach of the Yarlung Zangbo River in August 2015. This study provides the first published length–weight references on LWR for the five species. New maximum total lengths were recorded for three species, including Shizopygopsis stoliczkai, Gymnocypris chui, and Gymnocypris scleracanthus.
      PubDate: 2016-12-05T03:47:59.62366-05:0
      DOI: 10.1111/jai.13214
  • Swimming performance of adult bighead carp Hypophthalmichthys nobilis
           (Richardson, 1845) and silver carp H. molitrix (Valenciennes, 1844)
    • Authors: J. J. Hoover; D. P. Zielinski, P. W. Sorensen
      Abstract: Although the movement of invasive bighead carp (Hypophthalmichthys nobilis) and silver carp (H. molitrix) in the Upper Mississippi River system is dependent on their ability to swim through its numerous lock-and-dams, the swimming performance of adults of these species is at present unknown. Using a large (2,935-L) mobile swim tunnel, the swimming performance of adult bighead and adult silver carp was quantified at water velocities that challenged them to exhibit either prolonged and/or burst swimming (76–244 cm/s) with fatigue times of less than 10 min. Simple log-linear models best described the relative swim speed to fatigue relationships for both species. Under these conditions, the swimming performances of adult bighead and silver carp were similar to several species of adult fishes native to the Mississippi River system, but relatively low (
      PubDate: 2016-09-29T05:35:32.069108-05:
      DOI: 10.1111/jai.13199
  • Agonistic trials with mirrors do not elicit the same aggressiveness of a
           real trial in the matrinxã fish, Brycon amazonicus (Spix & Agassiz, 1829)
    • Authors: M. Serra; C. P. B. Wolkers, M. M. M. Mello, E. C. Urbinati
      Abstract: This study tested the efficacy of mirror trials in studying aggressiveness in the matrinxã fish, Brycon amazonicus. The hypothesis was that a mirror would elicit an aggressive response in B. amazonicus juveniles, but show different behavioral and physiological profiles than those observed in trials with real opponents. Fish were tested using either a mirror trial (n = 7) or a real trial (n = 7), that is, placed alone with a mirror or paired with a same‐sized opponent, respectively. All trials lasted for 20 min and took place in 96‐L aquaria with water temperatures of 28°C. Fish in mirror trials exhibited less locomotion (mirror: 423.3 ± 39.1; real trial: 735.1 ± 31.9; p 
      PubDate: 2016-09-22T00:55:30.463537-05:
      DOI: 10.1111/jai.13198
  • Reproductive biology of Pseudoplatystoma corruscans (Spix and Agassiz,
           1829) and Pseudoplatystoma reticulatum (Eigenmann and Eigenmann, 1889),
           two species of fisheries importance in the Cuiabá River Basin, Brazil
    • Authors: E. Barzotto; M. Oliveira, L. Mateus
      Abstract: The aim of this study was to compare the reproductive processes of two large catfishes, Pseudoplatystoma corruscans and Pseudoplatystoma reticulatum, from the Cuiabá River Basin. The reproductive process were assessed to: (i) characterizing the population structure and sex ratio; (ii) determining the reproductive period; (iii) estimating and quantify the nutritional status and energy reserves and their relationships with reproductive stages; and (iv) estimating the body length at first gonad maturation (TL50). Individuals were sampled monthly from July 2006 to February 2008 using gill nets, seine nets, hooks, casting nets and trotlines. In addition, 294 individuals were obtained from the artisanal fishery in the city of Cuiabá, Mato Grosso state, Brazil. Total lengths were greater for females for both species, with no significant difference in the sex ratio; growth was considered isometric, except for P. corruscans males. Peak reproductive activity was in December and January. Differences in the hepatosomatic index (HSI) in P. corruscans depended on the gender. In P. reticulatum the HSI did not differ between sexes or among developmental stages. For P. corruscans, the estimated mean total length at first maturity (TL50) was 62.92 cm, and for P. reticulatum 57.84 cm. Action to ensure the protection of the fish stocks should consider their reproduction processes, which are important for the equilibrium of these populations in the Cuiabá River, as well as for fisheries management.
      PubDate: 2016-09-22T00:55:22.910311-05:
      DOI: 10.1111/jai.13162
  • Energy acquisition and retention by age‐0 and age‐1 paddlefish
           Polyodon spathula (Walbaum, 1792) in relation to size, growth, and rearing
           conditions in two Great Plains reservoirs and hatchery ponds
    • Authors: R. J. Hemingway; D. L. Scarnecchia
      First page: 3
      Abstract: The objective of this study was to investigate lipid accumulation and storage in age‐0 and age‐1 paddlefish Polyodon spathula (Walbaum, 1792) in relation to age, stock, year, and growth. Juvenile paddlefish were collected from three locations in North Dakota and Montana, USA, during July and August of 2011 and 2012 and proximate analysis was used to determine lipid content. RNA/DNA ratios were used as an index of growth rates. Differences in age‐based lipid accumulation and storage in juvenile paddlefish suggest a split allocation between growth and lipid storage, with growth being the highest initial priority and emphasis on energy storage occurring at a larger size, later in life. Differences in lipid allocation between stocks indicate that allocation is influenced by hatchery/wild rearing conditions. Differences within and between year‐classes are consistent with field evidence observed in 2012 of a strong 2011 year‐class, and indicate that during productive times, paddlefish may allocate energy to both body growth and lipid reserves, and that allocation differs among years. The lack of a relationship between RNA/DNA ratio and lipid does not support a physiologically exclusive allocation strategy between growth and lipid. Evidence from this and other studies suggests rather that an emphasis on growth, some energy storage, and a large rostrum size in relation to overall fish length in age‐0 and age‐1 fish, may be adaptive in avoiding predation while accruing necessary energy reserves for overwintering. Although this study also provides reference information regarding proximate composition of wild and hatchery origin juvenile paddlefish, much more study is needed into the relationships among growth, low and high lipid groups, lipid allocation in juvenile paddlefish as well as the existence and timing of allocation changes between growth and storage. To aid in understanding paddlefish survival and year‐class strengths, these relationships also need to be linked to inter‐annual differences in early rearing environments for age‐0 and age‐1 fish.
      PubDate: 2016-09-26T02:06:17.296268-05:
      DOI: 10.1111/jai.13200
  • Range-wide assessment of pallid sturgeon Scaphirhynchus albus (Forbes &
           Richardson, 1905) relative condition
    • Authors: K. D. Steffensen; G. E. Mestl, Q. E. Phelps
      First page: 13
      Abstract: Pallid sturgeon Scaphirhynchus albus relative condition has been observed to be declining along the Nebraska reach (rkm 1212.6–801.3) of the Missouri River over the past several years; therefore, pallid sturgeon capture data was synthesized from the entire Missouri and Middle Mississippi rivers to document and compare how pallid sturgeon condition varies spatially and temporally throughout much of their current range. The study area was subdivided into four river reaches based on a priori statistical differences for pallid sturgeon catches from 2003 to 2015. Pallid sturgeon in the Middle Mississippi River (Alton Dam [rkm 321.9]) to the confluence of the Ohio River (rkm 0.0) were in the best condition while pallid sturgeon in the Middle Missouri River (Fort Randall Dam [rkm 1416.2]) to the Grand River confluence (rkm 402.3) were in the poorest condition. Furthermore, pallid sturgeon condition in the Upper Missouri River (Fort Peck Dam [rkm 2850.9] to the headwaters of Lake Sakakawea [rkm 2523.5] and lower Yellowstone River) and the Lower Missouri River (Grand River confluence to the Mississippi River confluence [rkm 0.0]) were significantly less than in the Middle Mississippi River but significantly higher than the Middle Missouri River. Temporally, pallid sturgeon condition was highly variable. Relative condition in the Middle Mississippi River was consistently above average (Kn = 1.1). Comparatively, Kn throughout the Missouri River rarely exceeded “normal” (Kn = 1.0), with Kn in the middle and lower reaches of the Missouri River having declined to the lowest observed. As pallid sturgeon recovery efforts continue, understanding the range-wide differences and effects on condition could be critical, as poor condition may cause maturation delays, reproductive senescence or even mortality, which affects the likelihood of natural reproduction and recruitment.
      PubDate: 2016-10-04T07:32:07.138675-05:
      DOI: 10.1111/jai.13206
  • Effects of sustained predation by fast-growing transgenic common carp
    • Authors: T. B. Zhu; L. H. Zhang, T. L. Zhang, Y. P. Wang, W. Hu, E. Ringø, Z. Y. Zhu
      First page: 22
      Abstract: The present study addressed the effects of growth hormone-transgenic and non-transgenic common carp (Cyprinus carpio L.) predation on the community and populations of four gastropod species cultured in artificial environments. After a 110-day population-based predation experiment (three replicate pools [16 m2] for each genotype with one fish [total length 45.0~51.4 cm] and 150 Bellamya aeruginosa (Reeve 1863) per pool), there were no significant effects of predation by either transgenic or non-transgenic carp on the biomass, number, or size selectivity of the population. Following a 10-day community-based predation experiment (three replicate pools [16 m2] for each genotype with one fish [total length 45.0~50.5 cm] and 150 Alocinma longicornis (Benson 1842), 100 Parafossarulus sinensis (Neunayr 1883), 55 B. aeruginosa, and 33 Radix auricularia L. per pool), the consumption rate and the number of gastropods predated by transgenic carp were 2.60 times and 2.85 times higher, respectively, than those of non-transgenic carp. Furthermore, the biomass of A. longicornis, P. sinensis and B. aeruginosa consumed by transgenic carp was significantly (p 
      PubDate: 2016-07-13T02:30:34.853997-05:
      DOI: 10.1111/jai.13130
  • Reproductive cycle of Triplophysa stenura (Herzenstein, 1888)
           (Balitoridae: Nemacheilinae) from the Yarlung Tsangpo River in the Tibetan
           Plateau, China
    • Authors: J. Y. Xie; Y. Xia, Y. Yan, W. T. Liang, C. Ren
      First page: 37
      Abstract: The reproductive biology of Triplophysa stenura, an indigenous cyprinid species from the Qushui County in the middle of the Yarlung Tsangpo River in the Tibetan Plateau, China, was investigated by bimonthly sampling from May 2014 to April 2015 using electrofishing. The gonadosomatic index (GSI) of T. stenura differed significantly between males and females over the seasonal trend, indicating that spawning extends from March (shortly after the ice melts) to May, as observed for indigenous species in response to environmental conditions on the cold plateau. Average oocyte diameter was 0.66 ± 0.13 mm, whereby the oocyte diameter distribution exhibited a clear seasonal pattern as the temporal pattern of GSI. Absolute fecundity of T. stenura was 3999 eggs/individual, which increased significantly with the increase in fish size and gonad weight, demonstrating the relationship of an exponential equation between them.
      PubDate: 2016-09-09T23:20:48.821397-05:
      DOI: 10.1111/jai.13166
  • Trophic role of demersal mesopredators on rocky reefs in an equatorial
           Atlantic Ocean island
    • Authors: E. Pinheiro; C. A. Layman, J. P. Castello, T. S. Leite
      First page: 47
      Abstract: The decrease in the number of sharks around Saint Peter and Saint Paul Archipelago (SPSPA) may impact food web structure. We investigated trophic relationships in the shallow rocky reefs of the SPSPA using stable isotopes and stomach contents with a particular focus on three abundant mesopredators: Caranx lugubris, Enchelycore nigricans and Muraena pavonina. Food web structure was described using samples of the most abundant basal resources, fishes and invertebrates, which were collected in April and October 2012. Individuals of the three focal species (n = 138: C. lugubris, n = 56; E. nigricans, n = 18; M. pavonina, n = 64) were collected during four expeditions to SPSPA (April and October of 2011 and 2012). Results suggest that this shallow water food web is supported by trophic pathways originating from benthic resources. Stable isotope data suggest potential competitive interactions between the whitespot moray and the other two mesopredators. Conversely, stomach content data suggest little niche overlap in the three focal species, but these data must be interpreted carefully because of the small sample sizes and restricted temporal sampling windows. All three mesopredators have a significant, albeit weak, relationship between body size and δ15N, suggesting ontogenetic diet shifts. These data contribute baseline information to assess shifts in food web structure that may stem from top predator decline in this unique ecosystem.
      PubDate: 2016-10-31T23:46:26.9898-05:00
      DOI: 10.1111/jai.13204
  • New record and range extension of the big‐scale sand smelt Atherina
           boyeri Risso, 1810 (Atherinidae) in the Devegecidi Dam Lake, Tigris River
           basin, Turkey
    • Authors: E. Ünlü; Ö. Gaygusuz, T. Çiçek, S. Bilici, B. W. Coad
      First page: 63
      Abstract: The big‐scale sand smelt, Atherina boyeri, is recorded from the Devegecidi Dam Lake in 2016, the first record of this invasive species in the Tigris River basin, with potential to extend to all countries in the Middle East. The smelts were caught with a trawl net mesh size of 6 mm. The captured specimens are described and compared. Records of A. boyeri from Turkish inland waters are summarised from the literature.
      PubDate: 2016-09-14T08:24:04.373503-05:
      DOI: 10.1111/jai.13192
  • Reproduction of the internal inseminator Trachelyopterus galeatus
           (Linnaeus, 1766) (Siluriformes: Auchenipteridae)
    • Authors: D. M. Roriz Lemes; B. Vizioli, L. Marcon, N. Bazzoli
      First page: 69
      Abstract: Studied was the reproductive activity of Trachelyopterus galeatus using microscopic analyses of gonads and biological indices. To evaluate the reproductive biology of T. galeatus, which is an important species in the Jequitinhonha River basin, Minas Gerais, Brazil, 254 males and 372 females were captured between May 2012 and April 2013 from the Irapé Reservoir using gillnets with meshes of various sizes. Average total length of males was 13.3 ± 2.1 and 14.3 ± 2.3 cm for females. Females were more abundant than males (1.4 females:1 male) in all total length classes. The reproductive peak of T. galeatus occurred between November and February, when the biological indices related to reproduction were highest and the physical‐chemical water parameters were most favourable for reproduction in this Neotropical environment. Trachelyopterus galeatus reproduces throughout the year and is a partial spawner.
      PubDate: 2016-09-26T02:06:27.597356-05:
      DOI: 10.1111/jai.13205
  • Adequate dietary protein level enhances stress resistance and immune
           status of blunt snout bream (Megalobrama amblycephala Yih, 1955)
    • Authors: H.-M. Habte-Tsion; M.-C. Ren, X.-P. Ge, V. Kumar, B. Liu, J. Xie, R.-L. Chen
      First page: 75
      Abstract: This study hypothesized that an optimum dietary protein level might play an important role in improving stress tolerance, enhancing an immune function, and ultimately minimizing temperature stress. For this purpose, the present study conducted a 10-week feeding trial followed by a 7-day stress experiment to evaluate the effects of dietary protein levels (28%–36%) on the physiological performances and hepatic Hsp70 gene expression in blunt snout bream Megalobrama amblycephala fry under a high temperature challenge. Fish fry (initial weight, 16.08 ± 0.03 g, n = 25) were fed with their respective diets to apparent satiation, and samples taken once before stress and four times during high temperature stress days (0.125, 0.5, 2 and 7 days). Serum total protein and cholesterol contents before stress were affected by dietary protein levels; during stress these parameters showed no significant changes up until day 2, showing some changes thereafter. Regardless of 0.125, 0.5, 2 or 7 days during stress, cortisol and aspartate aminotransferase levels in the group fed 32% dietary protein were significantly lower than in the other groups. At 0.125, 0.5 or 2 days during stress, the complement component 3 (C3) and 4 (C4) levels increased significantly up to certain levels, declining thereafter. The expression level of Hsp70 mRNA before stress was not affected by dietary protein levels, but increased significantly from 0.125 to 0.5 days during stress, and was reduced thereafter. Overall, low cortisol and high C3, C4 and Hsp70 mRNA levels were found in the group fed 32% protein throughout the stress experiment, which indicated that an adequate protein level enhances stress resistance and immunity in fish.
      PubDate: 2016-10-24T01:45:41.548662-05:
      DOI: 10.1111/jai.13219
  • Combining geometric morphometrics and genetic analysis to identify species
           of Opisthonema Gill, 1861 in the eastern Mexican Pacific
    • Authors: C. I. Pérez-Quiñónez; C. Quiñónez-Velázquez, J. S. Ramírez-Pérez, F. J. Vergara-Solana, F. J. García-Rodríguez
      First page: 84
      Abstract: Studies focusing on the specific identification of the taxonomic cast within the genus Opisthonema are scarce and contradictory, in spite of this species commercial importance and of the potential ecological impact that fisheries may have on the pelagic ecosystem. In this study, the specific composition of thread herrings Opisthonema (O. bulleri, O. medirastre, and O. libertate) in the southeastern region of the Gulf of California was identified using meristic characters, morphometric data, and mtDNA sequences. In this paper we supported the hypothesis that the commercial catch comprises three evolutionary entities with meristic and morphometric differences. The results were based on the number of ceratobranchial gill rakers, the presence of spicules on the gill rakers, the form of insertion of the gill rakers base onto the ceratobranchial segment, the geometric morphometrics of body shape, and the genetic distances from a fragment of Cytochrome Oxidase Subunit I gene (COI) of mtDNA. Specimens of Pacific thread herring were obtained from landings of the small pelagic fleet at Mazatlan, Sinaloa during 2011–2012. Taxonomic categories were assigned to 1060 individuals according to the measurement of meristic characters. A total of 228 thread herrings O. bulleri, (n = 76), O. medirastre (n = 76), and O. libertate (n = 76) were used in the morphometric analysis, and 25 specimens (O. bulleri n = 8, O. medirastre n = 7, and O. libertate n = 10) were used for genetic comparisons. The morphometric results showed differences among the three groups that had been previously identified using meristic characters, giving support to the existence of three discrete morphotypes. The percentage of sequence divergence of the COI gene supports the existence of three clades. Genetic distances were considerably lower within each clade than between clades. The results of this study provide sufficient evidence for the existence of three Pacific thread herring species in the southern Gulf of California.
      PubDate: 2016-10-28T00:36:31.303548-05:
      DOI: 10.1111/jai.13051
  • Iridophoroma in Indian mackerel, Rastrelliger kanagurta (Cuvier, 1816)
    • Authors: V. Singaravel; A. Gopalakrishnan, K. Raja
      First page: 116
      PubDate: 2016-11-11T06:20:58.850711-05:
      DOI: 10.1111/jai.13226
  • Nine novel microsatellites for the cavefish (Triplophysa rosa Chen &
           Yang, 2005)
    • Authors: S. Liu; A. Ludwig, Z. Peng
      First page: 119
      PubDate: 2016-10-11T04:31:10.395682-05:
      DOI: 10.1111/jai.13231
  • Development of 18 microsatellite markers for the white-streaked grouper,
           Epinephelus ongus (Bloch, 1790)
    • Authors: A. Nanami; K. Saitoh, M. Sekino
      First page: 121
      PubDate: 2016-11-21T02:12:05.718101-05:
      DOI: 10.1111/jai.13234
  • Karyotype and genome size of an endangered cavefish (Triplophysa rosa Chen
           & Yang, 2005)
    • Authors: Y. Niu; Q. Zhao, H. Zhao, A. Ludwig, Z. Peng
      First page: 124
      PubDate: 2016-09-26T02:06:29.082937-05:
      DOI: 10.1111/jai.13209
  • Nineteen novel microsatellites in Chinese lake gudgeon Sarcocheilichthys
           sinensis Bleeker, 1971
    • Authors: Y.-B. Shen; R.-Q. Wang, J.-Q. Ren, H.-T. Fu, X.-M. Yang, J. Li
      First page: 127
      Abstract: Nineteen polymorphic microsatellites isolated from a partial genomic DNA library of Sarcocheilichthys sinensis enriched for CA repeats were developed. Variability was tested on 48 unrelated individuals collected from Jiangsu province, China. Observed heterozygosity ranged from 0.200 (Ss236) to 1.00 (Ss223, Ss224), whereas the expected heterozygosity ranged from 0.213 (Ss232) to 0.939 (Ss224). Shannon's information index ranged from 0.405 (Ss236) to 2.988 (Ss224). Sixteen of the 19 microsatellites conformed to Hardy–Weinberg equilibrium. These microsatellites can be used for the evaluation of genetic parameters in populations to supply valuable information for conservation management.
      PubDate: 2016-11-21T02:12:17.376797-05:
      DOI: 10.1111/jai.13229
  • Two chemical marking procedures with Alizarin Red for piava Leporinus
           obtusidens (Valenciennes, 1837) juveniles
    • Authors: S. Hermes‐Silva; M. Roza de Abreu, E. Zaniboni‐Filho
      First page: 130
      PubDate: 2016-09-14T08:24:05.577237-05:
      DOI: 10.1111/jai.13189
  • First record of Odontaspis ferox (Risso, 1810) in the temperate
           south-eastern Indian Ocean from in situ observations in a deep-water
           canyon using baited video
    • Authors: C. M. Wellington; C. B. Wakefield, W.T. White
      First page: 133
      PubDate: 2016-11-07T02:06:22.106508-05:
      DOI: 10.1111/jai.13190
  • Habitat rehabilitation for juvenile fish in urban waterways: A case study
           from Berlin, Germany
    • Authors: A. Weber; C. Wolter
      First page: 136
      Abstract: This study examines the improvement of juvenile fish recruitment by technical rehabilitation measures implemented in two urban waterways in Berlin, Germany: the River Spree and the Teltow Canal. Rehabilitation sites provide new littoral habitats protected from navigation-induced flow and wake wash and are intended to improve habitat quality for juvenile fish and to support urban fish diversity. Both sites and four control sites with common embankments have been sampled monthly by point electric fishing (875 dips in total) from May to September 2009. In total, 6,243 fish were caught representing 12 species. Two of the species, roach (Rutilus rutilus) and perch (Perca fluviatilis), dominated the fish community, comprising 81.5% and 16.1% of the total catch. Nine species were rare, with relative abundances
      PubDate: 2016-10-11T04:31:32.425645-05:
      DOI: 10.1111/jai.13212
  • Gymnocypris chui Tchang, Yueh & Hwang, 1964 and Gymnocypris scleracanthus
           Tsao, Wu, Chen & Zhu, 1992 from Lake Langcuo, Qinghai-Tibet Plateau
    • Authors: R.-Y. Zhang; Y.-T. Tang, C.-G. Feng, S.-J. Liu, K. Zhao
      First page: 144
      Abstract: This study presents length-weight relationships (LWRs) for two sympatric species of the subfamily Schizothoracinae (Cyprinidae), Gymnocypris chui and G. scleracanthus, captured in Lake Langcuo in Tibet, China. A total of 193 specimens were collected in June and July of 2014 and 2015 using gill nets of different mesh sizes (mesh size: 2 × 2 cm, 3 × 3 cm). Specimens included 76 G. chui and 117 G. scleracanthus. The values of parameter b in the LWRs equations were estimated as 2.875 for G. chui, and 2.773 for G. scleracanthus, respectively. These are the first LWRs records for the two sympatric species.
      PubDate: 2016-08-08T10:03:49.373257-05:
      DOI: 10.1111/jai.13143
  • Competitive interactions under experimental conditions affect diel feeding
           of two common aquaculture fish species Labeo calbasu (Hamilton, 1822) and
           Cirrhinus cirrhosus (Bloch, 1795) of southern Asia
    • Authors: M. M. Rahman; S. R. Balcombe
      First page: 146
      Abstract: The effects of interspecific competition on grazing between two important aquaculture species, mrigal carp Cirrhinus cirrhosis and orangefin labeo Labeo calbasu, in single and in dual combinations were observed in experimental tanks. This study demonstrated that the presence of a competitor did not cause C. cirrhosis to shift its diel feeding patterns. That said, both total food intake and food preference were negatively affected in C. cirrhosis by the presence of a superior competitor, L. calbasu. The feeding patterns of L. calbasu became diurnal in the presence of C. cirrhosus, suggesting highly complex competitive interactions between the two species. That L. calbasu was specifically able to shift circadian feeding patterns to maximize energy intake in the presence of a competitor would suggest that it would be a suitable species to stock in a mixed species aquaculture system.
      PubDate: 2016-08-11T01:12:20.733827-05:
      DOI: 10.1111/jai.13157
  • Length–weight relationships of 20 fish species from Bahía de Matanchen,
           in the southeast Gulf of California, Mexico
    • Authors: J. R. Flores-Ortega; J. Granados-Amores, I. Zavala-Leal, J. T. Nieto-Navarro, D. S. Palacios-Salgado
      First page: 152
      Abstract: Length–weight relationship (LWR) parameters were determined for 20 fish species belonging to 14 genera and seven families. The fishes were collected monthly (May 2013 to February 2014) by soft-bottom trawls in Bahía de Matanchén, southeast of the Gulf of California. Sizes ranged between 5.5 and 36.0 cm total length (TL) and weighed between 1 and 901 g. The allometric coefficient (b) of the LWR varied from 2.638 for Chloroscombrus orqueta to 3.668 for Neopisthopterus tropicus. This is the first report of LWR estimations for 15 of the species.
      PubDate: 2016-10-24T01:45:33.54436-05:0
      DOI: 10.1111/jai.13227
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