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Journal of Applied Ichthyology    [8 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  [1594 journals]   [SJR: 0.427]   [H-I: 33]
  • Length‐weight relationships of diploid and tetraploid loach
           Misgurnus anguillicaudatus (Cantor, 1842) from the Yangtze River basin,
    • Authors: R. W. Li; K. Abbas, Y. Y. Yu, W. M. Wang, X. Y. Zhou
      Pages: n/a - n/a
      Abstract: Length‐weight relationships (LWRs) of diploid and tetraploid loach Misgurnus anguillicaudatus from the Yangtze River basin, China were estimated and compared.
      PubDate: 2014-01-08T10:00:46.391602-05:
      DOI: 10.1111/jai.12399
  • Effects of different protein and carbohydrate levels on growth performance
           and feed utilisation of brook trout, Salvelinus fontinalis (Mitchill,
           1814), at two temperatures
    • Authors: M. N. Amin; R. Katersky Barnes, L. R. Adams
      Pages: n/a - n/a
      Abstract: A 12‐week feeding trial was conducted to determine the optimum dietary protein requirement of brook trout, Salvelinus fontinalis, at 15 and 19°C. Twelve iso‐energetic (22 MJ · kg−1) and iso‐lipidic (23%) diets (36–58% protein at 2% increments) were prepared. Fish (29.45 ± 3.25 g · fish−1) were fed 2% of body weight per day, divided into two equal rations. The specific growth rate (SGR, % · day−1), feed efficiency ratio (FER), productive protein value (PPV), productive lipid value (PLV) and productive energy value (PEV), apparent digestibility of diet (ADDM) and protein (ADCP) were significantly higher at optimum temperature (15°C). Increasing PPV with increasing dietary carbohydrate and with decreasing dietary protein content was due to the protein‐sparing effect of carbohydrates. A piecewise regression (broken line) model between the SGR and digestible dietary protein level revealed that the digestible dietary protein requirement of brook trout was 44 and 40% at 15 and 19°C, respectively. When PPV (digestible protein retention basis) was modelled with a broken line, the digestible protein requirement of brook trout was 39 and 35% at 15 and 19°C, respectively. A reduction in dietary protein content balanced by increased gelatinised carbohydrate might be useful for improving the protein utilization efficiency for growth at 15 and 19°C; however, the growth and feed efficiency was lower at the elevated temperature.
      PubDate: 2014-01-06T09:08:22.228389-05:
      DOI: 10.1111/jai.12396
  • First record of the blue‐barred parrotfish, Scarus ghobban
           Forsskål, 1775 from Turkish coastal waters
    • Authors: C. Turan; D. Erguden, M. Gürlek, D. Yaglioglu, N. Uygur
      Pages: n/a - n/a
      PubDate: 2014-01-06T09:08:16.669222-05:
      DOI: 10.1111/jai.12402
  • Can microsatellite markers replace PIT tags in rohu (Labeo rohita
           Hamilton, 1822) selective breeding programmes?
    • Authors: P. K. Meher; L. Sahoo, A. Patel, P. Jayasankar, S. K. Tripathy, P. Das
      Pages: n/a - n/a
      Abstract: This study was undertaken to assess the feasibility of microsatellite markers for resolving parentage in Labeo rohita (rohu) selective breeding programmes in lieu of conventional PIT tag marking. Ten microsatellite markers were used to assign offspring parentage. A total of 160 individuals were tested from eight full‐sibling families. Eight highly polymorphic loci with allele numbers ranging from 2 to 8 and polymorphism information content (PIC) values in the 0.47–0.82 range were utilized. With the use of a real data set from a breeding programme, all but 12 individuals out of 160 could be assigned exclusively to their correct parental pairs. The matching rate was 92.5%, which was lower than in a simulated study (98.44%, Excl‐2). Discrepancies between simulations and real data sets may be due to several factors such as genetic relatedness among candidate parents (half‐sib and full‐sib), presence of null alleles, and sampling variance of the parents. The results of this study suggest that a marker panel probably with a wider genome coverage may be necessary for near‐100% accuracy in assigning parentage in rohu selective breeding programmes.
      PubDate: 2014-01-06T09:08:02.347932-05:
      DOI: 10.1111/jai.12395
  • Response of splenic melanomacrophage centers of Oreochromis niloticus
           (Linnaeus, 1758) to inflammatory stimuli by BCG and foreign bodies
    • Abstract: The study objective was to make histological, histochemical and morphometric evaluations on the splenic Melanomacrophage centers (MMCs) of tilapias, Oreochromis niloticus (Linnaeus, 1758), that were subjected to chronic inflammation stimuli by implantation (IMP) of a glass coverslip in the subcutaneous tissue and through inoculation of the bacillus Calmette‐Guerin (BCG). Randomly distributed in four groups were 150 tilapias: IMP (n = 45); IMP+BCG (n = 45); BCG (n = 45); and control (n = 15). Nine fish per treatment and three control fish were sampled on days 3, 7, 14, 21 and 33. The results demonstrated that increased numbers and areas of these structures were related to the type of stimulus, and that these were greater for the specific response. The principal pigment component identified was hemosiderin. Results suggest that the intensity of the MMC response in O. niloticus depended on the type of inflammatory stimulus used, and that it was greater in fish inoculated with BCG, which induced a granulomatous inflammation when compared to the foreign body inflammatory response induced by the glass coverslips.
  • Length–weight relationships and growth parameters of two endemic
           fish species (Floridichthys polyommus Hubbs, 1936 and Fundulus persimilis
           Miller, 1955) from the Yucatan Peninsula, Mexico
    • Abstract: This study reports length‐weight relationships and growth parameters for Floridichthys polyommus Hubbs, 1936 and Fundulus persimilis Miller, 1955 from La Carbonera, a karstic tropical coastal lagoon on the northwestern coast of the Yucatan Peninsula, Mexico. Specimens were collected between April 2009 and March 2010. The resulting length‐weight relationship for F. polyommus was: W = 0.0180 Lt3.37 and W = 0.0142 Lt3.35 for F. persimilis. This study presents the first estimation for both species of the von Bertalanffy growth model parameters, the growth performance index, the L50, and is the first report of the length‐weight relationship for F. persimilis.
  • Effect of artificial baits on the catch efficiency of monofilament gill
    • Abstract: Greater success in catching fish with gill nets is possible if more the fish are attracted to the nets. Bait has been successfully used to lure fish into the gill nets. With the aim of increasing the catch efficiency of monofilament gill nets, a study was conducted between January 2009 and December 2010 to test the effect of artificial baits on the efficiency of 40, 50 and 55 mm monofilament gill nets in the Keban Dam Lake (Elazığ/Turkey). The catch rate of the baited nets was compared to similar nets without bait. Baited nets caught 482 fish (71.8% of the total, seven species). Non‐baited nets caught 189 fish (28% of the total, seven species). The majority of fish (238) were caught using baited gill nets with 40 mm mesh. The most commonly caught species was Capoeta trutta. The differences between the baited gill nets and non‐baited gill nets were statistically significant (P 
  • Length‐weight relationships of dominant fish species from
           Caxiuanã National Forest, Eastern Amazon, Brazil
    • Abstract: The present work presents parameters of the length–weight relationships (LWR) for 12 species of freshwater fish from rivers within the Caxiuanã National Forest, Eastern Amazon. Data coverage include the main taxonomic groups in the sampling area: Characiformes: Acestrorhynchidae, Anostomidae, Curimaridae, Erythrinidae, Hemiodontidae; Siluriformes: Auchenipteridae; Perciformes: Sciaenidae. LWR parameters are estimated for the first time for five species: Leporinus affinis, Bryconops melanurus, Pygopristis denticulata, Serrasalmus gouldingi and Triportheus albus. Relative growth patterns were evenly distributed among species, one‐third showing negative allometry (b  3; n = 4).
  • Length–weight relationships for 37 freshwater fish species of Iran
    • Abstract: Length–weight parameters were estimated for 37 freshwater fish species of Iran belonging to seven families. Significant length–weight relationships with high correlation coefficients were found for all species.
  • Genetic diversity and population structure in the mtDNA control region of
           Liza haematocheilus (Temminck & Schlegel, 1845)
    • Abstract: The redlip mullet (Liza haematocheilus) is a commercial marine species widespread in the Northwestern Pacific. The genetic diversity and population structure of the redlip mullet collected from 2007 to 2010 along Chinese and Japanese coastal regions, were investigated by mitochondrial DNA. A total of 82 L. haematocheilus individuals were collected from five locations and 41 haplotypes were obtained. A pattern of distribution of genetic variability with high level of haplotype diversity (0.9642 ± 0.0104) and moderate nucleotide diversity (0.0162 ± 0.0085) was detected. The minimum spanning tree constructed with 41 haplotypes showed three divergent clades, corresponding to those defined in the NJ tree. Analyses of molecular variance and the population statistic FST also revealed significant genetic structures among populations of L. haematocheilus. The demographic history of L. haematocheilus was examined using neutrality tests and mismatch distribution analysis, which indicated a Pleistocene epoch population expansion. Comparisons of the Hakodate and Qingdao populations in different years demonstrated that marginal but significant (P  0.05) in the Hakodate populations. Knowledge of their genetic diversity and genetic structure is crucial to establishing appropriate fishery management for the species.
  • Gene pool and population structure in larval Herklotsichthys
           quadrimaculatus (Rüppell, 1837)
  • An evaluation of multiple‐pass seining to monitor blackstripe
           topminnow Fundulus notatus (Rafinesque, 1820) in the Sydenham River
           (Ontario, Canada)
    • Abstract: Multiple‐pass (i.e. removal) sampling and mark‐recapture experiments were undertaken in the Sydenham River (Ontario, Canada) to assess the effectiveness of seining to detect and estimate the local abundance of blackstripe topminnow, Fundulus notatus (Rafinesque, 1820) as well as to compare catch characteristics from closed and open (with and without block nets) sample units. Probability of species detection using three‐pass seining was estimated to be 0.58 in closed units, and 0.51 in open units. To be 95% confident of occupancy status, a minimum of five repeat surveys is required. A decline in catch occurred in only half of the sample units, population size estimates were often imprecise, and attempts to generate mark‐recapture population estimates were unsuccessful. Mean capture probabilities were 0.48 in closed units and 0.65 in open units, when depletion occurred. For blackstripe topminnow and other fishes encountered, there were no significant differences between closed and open units in the frequency of depletion or capture probability. Compared to single‐pass surveys, monitoring programs that employ three seine hauls are more likely to detect the presence of the blackstripe topminnow and any decline in local abundance.
  • Length–weight relationships of 33 selected fish species from the
           Cauca River Basin, trans‐Andean region, Colombia
    • Abstract: This study provides length–weight relationships (LWRs) for 33 fish species sampled with several types of fishing gear in six expeditions between 2010 and 2011, during the dry and wet seasons in the middle and lower Cauca River Basin, Northern Colombia. The report represents the first reference on LWRs for 28 species and also provides the new maximum size for 15 species.
  • Where are the little ones: distribution and abundance of the threatened
           serranid Epinephelus daemelii (Günther, 1876) in intertidal habitats
           in New South Wales, Australia
    • Abstract: A survey of intertidal habitats, including coastal rock pools, was undertaken across New South Wales (NSW), Australia, February to May 2012, to test the hypothesis that the distribution and abundance of threatened juvenile black cod Epinephelus daemelii (Günther, 1876) does not differ across marine bioregions. An assessment was also provided on their habitat use and site fidelity. Various methods were trialled to determine the best method for detecting juvenile E. daemelii, with the most suitable method being the deployment of small baited underwater high definition video cameras for a period of 30 min. Using these baited video cameras, sampling occurred across four bioregions in NSW, covering approximately 800 km of coastline. Within each bioregion, a minimum of nine locations was selected, and at each location a minimum of six intertidal habitats was surveyed for the presence of E. daemelii. Of 412 sites surveyed, a total of 20 juveniles (mean size = 16.7 cm ± 1.1 cm SE) were found in intertidal habitats along approx. 420 km of coastline. The smallest juvenile was LT 3 cm and the largest fish was stereo measured at LT 26.5 cm. E. daemelii were found to tolerate a large range of water quality parameters, particularly temperature (mean 21.7°C ± 0.7 SE, min = 16.8°C and max = 31.2°C) and dissolved oxygen (mean 11.2 mg L−1 ± 1.3 SE, min = 5.7 mg L−1 and max = 19.2 mg L−1). E. daemelii were found in habitats dominated by boulders and overhangs, indicating a preference for structural features that provide solid cover. No E. daemelii were recorded at sites that had algae as the dominant habitat type. Juvenile E. daemelii were found to display site fidelity to rock pool habitats, with two individuals recorded as remaining at their same sites for a period of 471 days, even though the rock pools were open to the ocean at high tides. This study indicates that the abundance of juvenile E. daemelii is low, especially north of Port Stephens where adults are most abundant. Use of the small baited video cameras proved to be a successful sampling method to confirm that juvenile E. daemelii utilise rock pool and shallow reef intertidal habitats in the early stages of their life cycle.
  • Use of diploid and triploid tench (Tinca tinca) blood as standards for
           genome size measurements
    • Abstract: The ploidy level of 10 diploid and 10 induced triploid tench, Tinca tinca, was verified using flow cytometry to determine relative DNA content of DAPI‐stained erythrocyte nuclei. The C‐value (haploid nuclear DNA content; pgDNA nucleus−1) of these same individuals was determined by means of Feulgen image analysis densitometry, in comparison to the chicken (Gallus gallus domesticus; 1.25 pg P 
  • Embryogenesis, visualization and migration of primordial germ cells in
           tench (Tinca tinca)
    • Abstract: Embryonic and larval development of the tench, Tinca tinca, is described, along with the origin and migration routes of germ cell lineage. Primordial germ cells (PGCs) potentially transmit genetic information to the next generation, and represent a powerful tool for creating a germ‐line chimera within fish species. PGCs were identified by injecting synthesized mRNA, combining green fluorescent protein and the zebrafish nos1 3′UTR, under the blastodisc of embryos at the 1–4 cell stage. Developmental stages were divided into five periods defined by morphological features: cleavage (40 min–5 h post‐fertilization (hpf), blastula (3.6–12 hpf), gastrula (12–20 hpf), segmentation (20–65 hpf), and hatching (65–188 hpf). The migration pathways of fluorescent PGCs were detected from 100% epiboly (18 hpf) to the end of the hatching period (184 hpf) in 69.3% of injected embryos, which migrated to the site of future gonads. Each hatching larva possessed 3–10 labeled PGCs with 95.1% of these cells localized at the genital ridge. These data may have use in practical aquaculture as well as in research to investigate germ‐line chimerism in tench.
  • Effect of the number of meshes in the protective bag circumference on size
           selectivity of demersal trawl codends
    • Abstract: This study investigated the effect of the number of meshes in the protective bag circumference on size selectivity of a demersal trawl codend. Circumferences of 50‐mesh (NMPB50) and 215‐mesh (NMPB215) protective bags rigged on the 44 mm diamond mesh codend were tested. Fishing experiments were carried out on the commercial trawler ‘Hapuloğlu’ between 20 and 27 August 2010, using a modified trawl net. Data were collected using the covered codend method and analyzed using the logistic equation with the maximum likelihood method. Mean selection curves were analyzed and compared using the between‐haul variations model. The mean L50 values of NMPB50 and NMPB215 were, respectively, 16.4 ± 0.1 mm and 16.5 ± 0.1 mm carapace length for deep‐water rose shrimp, 10.7 ± 0.1 cm and 12.2 ± 0.1 cm total length for hake, and 16.0 ± 0.1 cm and 16.7 ± 0.1 cm total length for horse mackerel. In conclusion, increasing the number of meshes around the protective bag resulted in a 14% and 4% increase in the L50 for hake and mackerel, respectively; however, these differences were not statically significant (P > 0.05).
  • Length–weight relationships of 16 fish species from the Liuxihe
           national aquatic germplasm resources conservation area, Guangdong, China
    • Abstract: Length–weight relationships were estimated for 16 fish species (Cyprinidae) from the Liuxihe National Aquatic germplasm resources conservation areas in China. This study presents the first reference on length–weight relationships for 12 species and new records of maximum length for six species.
  • Length–weight and length–length relationships for cavedano
           chub Squalius squalus (Bonaparte, 1837) in Italy
    • Abstract: Data of 31496 specimens of cavedano chub Squalius squalus were collected in 89 different waterbodies distributed geographically throughout Italy and used to provide length–weight and length–length relationship for this species. The linear relationship between total length (TL) and standard length (SL) was described by the equation TL (cm) = 4.007 + 0.874 SL (cm). The resulting total length–weight equation for cavedano chub in Italy was: log10 W = −2.121 + 3.083 log10 TL (cm).
  • Weight‐length relationships of 12 fish species from the Pando tidal
           creek estuary (subsystem of the Río de la Plata, Uruguay)
    • Abstract: Weight–length relationships are presented for 12 fish species from a subsystem of the Río de la Plata estuary in Uruguay. This study provides new maximum lengths for three species and a new reference for the weight–length relationship of one species.
  • Weight–length relationships for 38 fish species of Barra de Navidad
           coastal lagoon, Jalisco, Mexico
    • Abstract: Weight–length relationships are reported for 38 species of teleost fish belonging to 20 families. Data were collected on a regular basis from February 2011 to January 2012 in the Barra de Navidad coastal lagoon, Jalisco, Mexico. Several different types of sampling gear were used to obtain a broad range of fish lengths. These are the first records in FishBase regarding weight–lengths for eight of the species.
  • Weight–length relationships of 22 fish species from Paraíba do
           Sul River in Rio de Janeiro State, southeastern Brazil
    • Abstract: The present study reports the weight–length relationships of 22 fish species from middle stretches of the Paraíba do Sul River, a riverine system located in the most important economic regions of Brazil and which is under great pressure due to damming and others ventures. Data were collected quarterly in 2010 and 2011 from three reservoirs and the adjoining downstream by using three different mesh sizes of gill nets. Of the 22 species, eight had no records in the FishBase WLR database; new maximum lengths are given for eight species.
  • Population structure and reproduction of the Neotropical catfish Pimelodus
           pohli, Ribeiro and Lucena, (Teleostei: Pimelodidae)
  • The presence of phytase in yeasts isolated from the gastrointestinal tract
           of four major carps [Labeo rohita (Hamilton, 1822), Catla catla (Hamilton,
           1822), Cirrhinus mrigala (Hamilton, 1822), Hypophthalmichthys molitrix
           (Valenciennes, 1844)], climbing perch [Anabas testudineus (Bloch, 1792)]
           and Mozambique tilapia [Oreochromis mossambicus (Linnaeus, 1758)]
  • Gut morphology and relative gut length do not reliably reflect trophic
           level in gobiids: a comparison of four species from a tropical
           Indo‐Pacific seagrass bed
  • Degassing to reduce carbon dioxide during live transport of adult salmon
           in wellboats: a model approach
  • Occurrence, length–weight and length–length relationships of
           Champsodon nudivittis (Ogilby, 1895) in the Aegean Sea
  • New record of Plectorhinchus pictus (Tortonese 1936), Satyrichthys adeni
           (Lloyd 1907) and Chascanopsetta lugubris Alcock 1894 from the Arabian Sea
           coasts of Oman
  • Range extension of Odontesthes argentinensis (Valenciennes, 1835)
           (Teleostei: Atherinopsidae) in the southwestern Atlantic, with additional
           records in the Rio de Janeiro State, Brazil
  • Total length estimation of the Brazilian flathead Percophis brasiliensis,
           using morphometric relationships of skull, pectoral girdle bones, otoliths
           and specific body measures, in Argentine waters
    • Abstract: Predictive regression equations were generated to estimate total length of the Brazilian flathead (Percophis brasiliensis) fish using skull and pectoral girdle bones as well as specific body and otolith lengths. All regressions were statistically significant. The features of bone and external body regressions evidently have the capability to increase the amount of dietary information obtainable from stomach content analyses of the Southwest Atlantic piscivores.
  • Reproductive biology of Metaschistura cristata in northeastern Iran
    • Abstract: The study purpose was to investigate the reproductive biology, growth and length‐weight of the Turkmenian crested loach, Metaschistura cristata, in the Radkan River of northeastern Iran. Age and growth are described for 1029 specimens from January 2009 to December 2010. The sex ratio was 1:1. Maximum age, based on opercula readings, was 6+ years for both sexes. Specimens ranged in size from 24 to 98 mm total length and weighed from 0.08 to 7.32 g. The length‐weight relationships were described as W = 0.005166 TL3.225 (R2 = 0.97) for males and W = 0.006192 TL3.125 (R2 = 0.97) for females. Growth was expressed in length and the von Bertalanffy growth parameters were estimated as L∞ = 354.9 mm, k = 0.0038, t0 = −26.82 for males and L∞ = 339.0 mm, k = 0.0043, t0 = −24.88 for females. Growth performance indexes were also estimated as Φ′ = 6.17 for males and Φ′ = 6.20 for females. The gonadosomatic index showed that peak reproduction occurred during April and June, with highest average values of 2.1% for males and 25.3% for females in May. Oocyte diameter ranged from 0.09 to 1.58 mm, with a mean value of 0.54 ± 0.42 mm.
  • Morphological variations of Schizothoracinae species in the Muzhati River
    • Abstract: This paper reports on the morphological variations of six Schizothoracinae species, including Aspiorhynchus laticeps, Schizothorax biddulphi, Schizothorax eurystomus, Schizothorax barbatus, Schizothorax intermedia, and Diptychus maculatus, the first reference to the morphological characters of these species. Based on the results from the cluster analysis, S. biddulphi and S. eurystomus are the most morphologically similar, with their Euclidean distances within 0.0167; their morphological similarity to S. intermedia, A. laticeps, and D. maculatus is gradually reduced, with an increase in the Euclidean distance from 0.0317 to 0.5765.
  • Vitamin losses during frozen storage of Liza aurata (Risso, 1810),
           Cyprinus carpio L. 1758, Clupeonella cultriventris caspia (Nordmann,
           1840), Rutilus frisii kutum (Kamenskii, 1901) and Sander lucioperca (L.,
    • Abstract: The objective of this study was to determine the fat and water‐soluble vitamins contents (A, E, D, K, B1, B2, B6, B12, niacin, biotin, ascorbic, folic and pantethonic acids; in mg kg−1 fresh weight) lost during frozen storage (−24°C) in time intervals of 0, 1, 2, 3 and 4 months. Studied species included: Liza aurata (golden grey mullet), Cyprinus carpio (common carp), Clupeonella cultriventris caspia (common kilka or sprat), Rutilus frisii kutum (Caspian kutum) and Sander lucioperca (pike perch). Results showed that A, D and K vitamin losses occurred in all samples during storage, but no statistically significant differences were observed. Vitamin E losses under frozen conditions were significant in common kilka, Caspian kutum and pike perch, however, not in golden grey mullet or common carp. A decrease in vitamin C was significant in all fish species, but there were no significant decreases in other water‐soluble vitamins (B1, B2, B6, B12, niacin, folic acid, pantothenic acid, biotin).
  • Spatial and temporal changes in the fish communities from a
           mangrove‐dominated creek system near Karachi, Pakistan
    • Abstract: The objectives of the study were to inventory the fish community, examine how the fish communities changed in these creeks temporally (season), and compare the fish communities between creeks of varying structure (width). During February 1999 to December 2001, a survey was undertaken to monitor the distribution and abundance of fishes in the Korangi‐Phitti Creek (KPC) system (24°45′N, 67°20′E) near Karachi, Pakistan. Fish were collected from 123 stations using a combination of monofilament gillnets of 8.9 cm, 5.7 cm, and 3.8 cm stretched mesh sizes. A total of 17 023 fish representing 86 species were collected during the study; Sardinella gibbosa and Nematalosa nasus were the most abundant taxa (in terms of numbers of individuals) collected, accounting for over 60% of the total catch. Physical conditions in the study area were found to have significant seasonal (monsoon) patterns related more to temperature and salinity than to rainfall. Seasonal comparisons indicated that the communities were significantly different between the northeast monsoon (NEM) and southwest monsoon (SWM) seasons. Taxa primarily responsible for distinguishing the NEM were the mullets (Moolgarda cunnesius, Liza carinata, Mugil cephalus). The SWM was characterized by Anodontostoma chacunda, Scomberoides commersonnianus, and the engraulid (Thryssa hamiltonii). The community sampled in wide creeks (shipping channels) was very different in composition than the community in small creeks within this system. Wide creeks were characterized by schooling pelagic species (S. gibbosa, N. nasus), while the smaller creeks were characterized by the presence of mullets (M. cunnesius, M. cephalus, L. carinata) and scat (Scatophagus argus). The KPC system was shown to contain a highly diverse fishery, which in turn contributes to regional offshore fisheries (shad, mackerel, tuna and perches). The various negative natural and anthropogenic events in this region highlight the need for information regarding the fish community, water quality, and the mangrove forest to evaluate ecosystem changes, the effects of disturbances, and for the development and making of sound management decisions.
  • Cryopreservation of giant grouper Epinephelus lanceolatus (Bloch, 1790)
    • Abstract: The grouper, Epinephelus lanceolatus, is a vulnerable species of high economic value. An effective protocol was developed for the cryopreservation of E. lanceolatus by comparing different extenders produced by mixing various cryoprotectants (dimethyl sulfoxide, methanol and glycerol) and diluents (MPRS, TS‐2, TS‐19, Cortland and Hank's). Using computer‐assisted sperm analysis (CASA) and morphological analysis, the sperm motility and fertilization rates from post‐thaw sperm were comparable to untreated controls. The results revealed that MPRS (containing 12% DMSO) or TS‐19 (containing 12% DMSO), were the optimum extenders for protecting the sperm from cryo‐damage in liquid nitrogen. The post‐thaw sperm maintained high motility (90.61 ± 3.03%) and a fertilization rate (92.27 ± 2.43%) similar (P > 0.05) to fresh sperm (94.34 ± 4% and 94.10 ± 1.87%). This study is the first to report on the successful sperm cryopreservation of E. lanceolatus and provides an important tool for repopulating this species through aquaculture.
  • Extension of sperm motility leads to increased rates of fertilization and
           hatching in curimba, Prochilodus lineatus
    • Abstract: The objective of this study was to evaluate the effects of six activating solutions on duration of sperm motility, fertilization rate (FR), and hatching rate (HR) of Prochilodus lineatus (Valenciennes, 1837). The activating solutions (SA) used were: SA0 (199 mOsm kg−1, pH 8.5), SA1 (138 mOsm kg−1, pH 7.5), SA2 (256 mOsm kg−1, pH 7.5), SA3 (131 mOsm kg−1, pH 10), NaCl (92 mOsm kg−1, pH 7.5) and distilled water (32 mOsm kg−1, pH 7.5). SA1 induced the highest motility, FR and HR, compared with the other activating solutions. The lowest motility was obtained with SA0, with no fertilization or hatching, whereas motility was zero with SA2 and SA3. It is possible to conclude that the solution SA1 can be used for the activation of gametes during fertilization in induced reproduction of curimba to achieve higher fertilization and hatching rates. Thus, it was found that the osmolality and pH of activating solutions, probably with the participation of dissolved substances therein, are the main factors acting on semen motility after activation.
  • Reproductive biology of Chinese minnow Hemiculterella sauvagei
           Warpachowski, 1888 in the Chishui River, China
    • Abstract: This study describes the reproductive biology of the Chinese minnow Hemiculterella sauvagei. The length‐weight relationship, sex ratio, spawning season, size at first maturity, and fecundity were analyzed based on 685 specimens collected from the Chishui River between July 2011 and July 2012. The relationship between standard length (SL) and body weight (BW) were estimated as BW = 2.14 × 10−4 × SL2.801 (R2 = 0.839; N = 413; P 
  • Reproductive strategy of the European perch, Perca fluviatilis Linnaeus,
           1758 (Osteichthyes: Percidae) in the Anzali wetland, southwest Caspian Sea
    • Abstract: Temporal variation in reproductive traits of geographically distributed fish is supposed to take place in response to the spatial and environmental variations. With regard to the wide distribution of the European perch in the northern hemisphere, important reproductive traits such as the initiation and duration of the spawning activity are likely to vary in different latitudinal gradients. In this study, reproductive biology of the European perch, Perca fluviatilis, is described, based on 324 specimens caught in the Anzali wetland (southwest Caspian Sea) between June 2008 and May 2009. The gonadosomatic index, oocyte frequency distribution and histological examination suggested a long vitellogenic process (October to February) and a short spawning season (January and February). The size‐frequency distribution of the oocytes showed that this perch is a species with group‐synchronous ovarian development. Ovarian development occurred only in one clutch of oocytes (700–900 μm oocyte diameter) with no indication of maturation of any subsequent clutch in the spawning season. The average of (realized) fecundity (±SD) was estimated to be 16177 ± 5846 eggs in late vitellogenic stage, which was lower than the potential fecundity (17188 ± 6917 eggs). Histological examination of the gonads revealed the existence of atretic oocytes in early vitellogenic stages (October and November). This investigation highlights the temporal variation in the initiation and duration of the reproductive activity of the European perch in this region compared to other geographical regions. The results emphasize the necessity of specific temporal management in fishing of European perch based on spatial differences in reproductive biology.
  • Larval width as indicator of growth rate and effect of larval
           classification on final body composition and flesh quality in cultured
           gilthead seabream (Sparus aurata, L.)
    • Abstract: The objective of this study was evaluating the effects on the growth rate and flesh quality of separating larvae according to their larval width in cultured gilthead seabream (Sparus aurata, L.). Progeny from two broodstocks (A and B) were divided into two groups according to larval width: heads (being the larger specimens) and tails. After 18 months both groups were analysed to evaluate growth, carcass traits and proximal composition. The head specimens reached a larger size and showed a greater level of well‐being and degree of nourishment. Total body and fillet composition in general were found to be as expected for this species. Some differences were found in total body composition between head and tail specimens in both batches, and in the fillet composition in batch B (higher fat and lower moisture content in the head specimens). Sensory analyses were carried out using untrained panelists, who were unable to distinguish between the head and tail samples in batch A, whereas differences were noticeable in batch B. Samples from the head group were judged to be tastier and juicier, a consequence of their higher fat content. Hence, fish separation according to larval width is an effective tool to separate progeny into slow and fast growing groups, whereas the total body and fillet analyses and a sensory test ensure that the selection does not generate negative effects on the product quality.
  • Identifying growth parameters for two endemic species [Capoeta antalyensis
           (Battalgil, 1943) and Pseudophoxinus antalyae Bogutskaya, 1992] in Duden
           Creek, Antalya, Turkey
    • Abstract: It is hypothesized that Capoeta antalyensis (Battalgil, 1943) and Pseudophoxinus antalyae (Bogutskaya, 1992) might display specific growth characteristics that differ from other species of their genus. Age and growth were described for species from Duden Creek (Antalya, Turkey) from February 2008 to January 2009. The length–weight relationship for all individuals were described by the parameters: a = 0.0143 and b = 2.946 for C. antalyensis and a = 0.0084 and b = 3.251 for P. antalyae. The von Bertalanffy growth parameters based on data from scales were L∞ = 35.78 cm, k = 0.251 year−1 and t0 = −0.30 for C. antalyensis and L∞ = 22.59 cm, k = 0.232 year−1 and t0 = −0.78 for P. antalyae. The growth characteristics for these two species are not much different from those of closely related species from the same genus.
  • Issue Information
  • The genetic diversity of wild Oreochromis mossambicus populations from the
           Mozambique southern watersheds as evaluated by microsatellites
    • Abstract: Tilapia is native to Africa, and one of the most cultivated fish in the world. The goal of this research was to evaluate the genetic diversity of tilapia Oreochromis mossambicus from the Limpopo, Incomati, Umbeluzi and Sabié rivers in Mozambique. Microsatellite markers were used to assess the genetic structure and to compare the genetic variability of wild populations of O. mossambicus. DNA samples from 200 specimens were analyzed. All five loci (UNH104, UNH129, UNH142, UNH222 and UNH231) used in this study were polymorphic, with observed heterozygosity ranging from 0.940 to 1.000 and the allelic richness average (Ar) ranging from 8.937 to 15.751. All of the stocks exhibited a remarkably significant excess of heterozygosity relative to the Hardy‐Weinberg Equilibrium. Evidence of a genetic bottleneck was found in the four populations evaluated herein. The genetic structure of the population was investigated using the analogues FST and DEST. The most genetic variability occurred within populations. Differentiation among populations ranged from low to moderate levels. No significant correlation was found between geographic and genetic distances. Implications of these findings for management and conservation of O. mossambicus stocks are discussed.
  • Feeding habits of Schizothorax oconnori Lloyd, 1908 in the Yarlung Zangbo
           River, Tibet
    • Abstract: Seasonal, ontogenetic and sexual feeding habits of Schizothorax oconnori in the Yarlung Zangbo River were studied using percentages by number, weight and index of relative importance (IRI). The Schoener overlap index was applied to compare diets related to season, fish size and sex. The feeding intensity exhibited seasonal trends, with a minimum food intake in summer. Overall, 103 prey taxa belonging to seven prey categories (diatoms, green algae, cyanophytes, other algae, small invertebrates, macroinvertebrates and remains) were identified in 136 guts. Highest feeding diversity and evenness were recorded in summer, while lowest values of both indices occurred in autumn. S. oconnori fed almost exclusively on periphyton. Diatoms were the most important prey in terms of number, weight and IRI, followed by macroinvertebrates; other prey were also occasionally ingested. S. oconnori is a generalized and opportunistic feeder relying upon a wide trophic spectrum, but mainly feeds on diatoms as they are the most prevalent periphyton. There were high diet overlaps among seasons, fish sizes and between sexes. S. oconnori showed no dietary preference for any of the other prey available in the periphyton community.
  • Length–weight, length–length relationships and length at first
           maturity of fish species from the Paraná and Uruguay rivers,
    • Abstract: Length–weight relationships (LWR) were estimated for 12 species, representing three orders and eight families of fishes from the Paraná and Uruguay rivers in Argentina: Acestrorhynchus pantaneiro, Cynopotamus argenteus, Pachyurus bonariensis, Pterodoras granulosus, Hypostomus commersoni, Pseudoplatystoma corruscans, Pimelodus maculatus, Parapimelodus valenciennis, Salminus brasiliensis, Prochilodus lineatus, Hoplias malabaricus and Leporinus obtusidens. For the last four species, the length at first spawning (Lm) was estimated using three different methods. The captures were made in shallow river areas during 2005–2013. Significant length–weight relationships were found for all species. None or few LWRs were previously available for these species.
  • Growth and mortality of two small fishes, Toxabramis swinhonis
           Günther, 1873 and Hyporhamphus intermedius (Cantor, 1842), in a
           Yangtze shallow lake (China) assessed by length frequency analysis
    • Abstract: This study examined the growth and mortality of two widespread small fish species, Toxabramis swinhonis (Cyprinidae) and Hyporhamphus intermedius (Hemiramphidae), from a shallow lake (Niushan Lake, China) along the Yangtze River, by analyzing monthly length frequency data (July 2005 to June 2006) with the FAO‐ICLARM stock assessment tool (FiSAT). Estimated von Bertalanffy growth equation parameters were: L∞ (asymptotic length) = 145 mm TL, and K (growth coefficient) = 0.66 year−1 for T. swinhonis; L∞ = 189 mm TL, and K = 0.68 year−1 for H. intermedius. The instantaneous rates of natural mortality (M) calculated for T. swinhonis and H. intermedius were 1.35 and 1.28 year−1, respectively. The length‐converted catch curve method gave the total annual instantaneous mortality rate (Z) of 2.92 year−1 for T. swinhonis and 1.53 year−1 for H. intermedius. Recruitment patterns of both species were continuous, displaying a single major peak event per year. Despite not being of direct fishing interest, T. swinhonis, with high abundance and productivity as indicated by a high Z‐value, can be an important species in fisheries management as an excellent food source for aquatic organisms, especially for larger fishes of economic value. These results represent the first information on population characteristics of T. swinhonis and H. intermedius, and constitute a comparison base for future growth studies in other lake environments.
  • Identification of Mycobacterium species from apparently healthy freshwater
           aquarium fish using partial sequencing and PCR‐RFLP analysis of heat
           shock protein (hsp65) gene
    • Abstract: The present study analysed the incidence of mycobacteria in apparently healthy looking freshwater aquarium fish in Uttar Pradesh (State), India. Sixty fish belonging to eight different species were collected from six aquarium shops in different cities and processed for isolation of Mycobacterium species. Using the initial protocol of decontamination of tissue homogenates (with 1N HCl & 2N NaOH) and incubation at 30°C for 2 months, Mycobacterium sp. was isolated from 25% of the fish. The isolates were identified by standard biochemical tests. A 441 bp fragment of the hsp65 gene was amplified and digested by two fastdigest restriction enzymes, BstEII and HaeIII. Digested products were analysed using agarose gel electrophoresis. Sequencing of amplified fragments of the hsp65 gene was also performed. Isolates were identified as: five isolates of M. abscessus, three M. gordonae, two M. fortuitum, two M. conceptionense, two M. parascrofulaceum, and one isolate of M. senegalense. Mycobacterial incidence in apparently healthy looking freshwater aquarium fish is dreadful and the study is relevant because of the mycobacterial diversity related to aquarium fish and its zoonotic importance. All Mycobacterium species isolated in this study are well known pathogens in humans as well as fish.
  • Effect of replacing different levels of dietary fishmeal with Jatropha
           curcas kernel meal on the development of Nile tilapia Oreochromis
           niloticus (Linnaeus, 1758)
    • Abstract: The present trial tested the applicability of Jatropha curcas kernel meal (JKM) as a protein source in diets for Nile tilapia (Oreochromis niloticus) in terms of growth and body composition. Four diets were produced replacing 0% (Control), 50% (J50), 75% (J75) and 100% (J100) of fishmeal with JKM. In a fifth diet, 70% of fishmeal was replaced by JKM, and another 20% replaced by blood meal to minimize crystalline lysine addition. Body mass gain of fish fed the control diet was significantly higher than in all other treatments. However, specific growth rate (SGR) and feed conversion ratio (FCR) were not significantly different between diets J50, J75 and the control. Fish fed the control diet had a lower body protein content, but higher body fat and energy content than fish fed the JKM‐based diets. An adaptation of fish fed diets J50, J75 and J100 could also be observed, as these diets showed worse FCR‐values over most of the first three quarters of the experiment and equal (or in the case of J75, even significantly better) FCR‐values over the final 2 weeks. Despite slightly slower growth, JKM should be further included in the search of alternative plant‐feedstuffs in diets for tilapia, as the growth observed here for up to 75% replacement of fishmeal was very promising.
  • A life‐stage population model of the European sturgeon (Acipenser
           sturio L., 1758) in the Elbe River. Part II: assessment of the historic
           population decline
    • Abstract: A post‐hoc analysis on the decline of the European sturgeon (Acipenser sturio) population in the Elbe River was performed for the end of the 19th century. A modeling approach was applied to determine the role of various factors potentially impacting the population. Using an age‐structured population model developed for European sturgeon, the estimates of fishing efficiency in the Elbe were verified. Catches reported from 1850 to 1920 were used as a basis to identify the population size, dynamics of the decline and the impacts contributing to the population decline. According to results of the model, the historic population size of the European sturgeon in the Elbe River exceeded 450 000 individuals. The population revealed a significant response in abundance of adults towards the fishery directed at spawning migrants, even at low fishery effort. Unsustainable fishery was the initial cause of the population decline, while increasing pollution and habitat degradation revealed significant impacts after 1860. The results represent a good example for the fisheries ‘hyperstability’ phenomenon. In the case of the Elbe fishery, an increasing fishery effort was masking the actual population decline while temporarily maintaining the overall yield. The results indicate that, for sturgeons and other species with similar life history patterns, the use of fishery data for the assessment of population dynamics and fishery sustainability has to be applied with due caution, as it might produce false images of the population size and dynamics.
  • Full westward expansion of Rutilus rutilus (Linnaeus, 1758) in the Iberian
  • Histopathological alterations in rainbow trout, Oncorhynchus mykiss
           (Walbaum, 1792), induced by irradiated alginic acid
  • Length–weight relationships of six fish species from the upper
           reaches of the Yangtze River, southwest China
    • Abstract: Length–weight relationships (LWRs) were determined for six endemic fish species [Glyptothorax fokiensis (Rendahl, 1925), Lepturichthys fimbriata (Günther, 1888), Liobagrus marginatus (Günther, 1892), Percocypris pingi (Tchang, 1930), Pseudobagrus pratti (Günther, 1892) and Sinibotia superciliaris (Günther, 1892)] from the Pan Zhihua reach of the Jinsha River, which is located in the upper reaches of the Yangtze River, southwest China. Samples were obtained between May 2004 and April 2012 using various types of fishing gear and electroshock fishing techniques. For each species, the sample size, length range, weight range, LWR, 95% confidence intervals of a and b, and coefficient of correlation were determined. Values of b were between 2.306 for P. pratti and 2.934 for P. pingi, and r2 values ranged from 0.952 for G. fokiensis to 0.995 for P. pingi. Prior to this study, the LWRs for three of these endemic species were unknown.
  • Growth and reproduction of a stream population of Cobitis turcica in
           central Anatolia (Turkey)
    • Abstract: Cobitis turcica is endemic to Anatolia, and being of a bottom‐dwelling nature is highly influenced by habitat degradation. Due to drought and water pollution, in 2006 this species was included in the IUCN Red List as endangered. Therefore in order to develop conservation strategies, knowledge of its life history traits is important. The study presents first time data on the basic life history traits of C. turcica captured in a small stream flowing from Pınarbaşı Springs to Kozanlı Gök Lake in central Anatolia. In total, 1356 specimens were caught between March 2003 and August 2004. The overall sex ratio (M : F) was 1 : 0.62. Longevity in females, which reaches a maximum age of 6+, is 1 year longer than for males. Females are longer and heavier than males of the same age group. Maximum observed total lengths were 103.6 mm in a 5+ year‐old male and 126.75 mm in a 6+ year‐old female. Length–weight relationships were calculated for males, females, and juveniles, with the b exponent of the relationships as 2.9068, 2.8326, and 3.6859, respectively. Spawning was fractional, beginning in April and continuing until the end of July. Mean total fecundity was 2238 at age 5+.
  • Effect of frozen storage on fatty acid composition of the different
           tissues of four scombrid and one dussumeriid species
    • Abstract: In the current study, the effect of frozen storage at −18°C was evaluated on fatty acid composition of different body parts (liver, muscle tissue, and viscera) of narrow‐barred Spanish mackerel (Scomberomorus commerson, Lacépède, 1800), longtail tuna (Thunnus tonggol, Bleeker, 1851), kawakawa (Euthynnus affinis, Cantor, 1849), king mackerel (Scomberomorus guttatus, Bloch & Schneider, 1801), and rainbow sardine (Dussumieria acuta, Valenciennes, 1847) caught in the Persian Gulf. Changes in saturated fatty acids (SFAs), monounsaturated fatty acids (MUFAs), polyunsaturated fatty acids (PUFAs), eicosapentaenoic acid plus docosahexaenoic acid/palmitic acid (EPA+DHA/C16), ω3 PUFA/ω6 PUFA (ω3/ω6), and polyunsaturated fatty acids/saturated fatty acids (PUFA/SFA) were investigated during a 6‐month period. A decrease in unsaturated fatty acids, particularly PUFAs (60–100%) as well as ω3/ω6, EPA+DHA/C16 (polyene index) and PUFA/SFA ratios, indicated a decrease in the nutritional values of the samples.
  • Monthly fluctuations during the breeding season of sperm density, volume,
           motility, and composition of seminal and coelomic fluid in broodfish of
           Persian sturgeon, Acipenser persicus Borodin, 1897
    • Abstract: Obtaining knowledge on the gamete quality of certain species is essential for appropriate management and conservation of wild stocks of the species concerned. In the present study, eighteen breeders (nine males and nine females) of Acipenser Persicus Borodin, 1897 were selected for recording breeding season changes in gamete quality in terms of the parameters: spermatozoa motility indices, sperm volume and density, ionic composition and osmolality of seminal and coelomic fluids. Stripping was performed at the beginning of March and during April and May. Results indicated that sperm volume (ml per male) and density (×109 spz ml−1) decreased towards the end of the spawning season. There was no significant change in osmolality (mOsmol kg−1) or in the concentrations (as mm) of sodium, potassium, magnesium or calcium ions in either the seminal or the coelomic fluids during the breeding season. A significant difference in chloride ion concentration in the coelomic fluid was noted at different times during the spawning season. The percentage of motile spermatozoa at 45 s post‐activation was not significantly different for samples taken at different dates, but the maximum duration of spermatozoa movement, at 15 s post‐activation, was observed in March. This value decreased significantly towards the end of the reproductive season. In conclusion, changes observed in A. persicus sperm parameters during the breeding season suggest an association between such changes and the sperm aging processes.
  • Risk screening of non‐native freshwater fishes at the frontier
           between Asia and Europe: first application in Turkey of the fish
           invasiveness screening kit
    • Abstract: The aim of the present study was to assess the invasive potential of introduced non‐native and translocated fishes in Turkey (Anatolia and Thrace) by applying the Fish Invasiveness Screening Kit (FISK), a risk identification tool for freshwater fishes. From independent evaluations by two assessors of 35 species, calibration of FISK for Turkey identified a threshold score of 23, which reliably distinguished between potentially invasive (high risk) and potentially non‐invasive (medium to low risk) fishes for Anatolia (Asia) and Thrace (Europe). No species was categorized as ‘low risk’, 18 species were categorized as ‘medium risk’ and 17 as ‘high risk’ (two being ‘moderately high risk’, nine ‘high risk’, and six ‘very high risk’). The highest scoring species was gibel carp Carassius gibelio, whereas the lowest scoring species was Caucasian dwarf goby Knipowitschia caucasica, a translocated species. Assessor certainty in their responses averaged overall between ‘mostly uncertain’ and ‘mostly certain’, with red piranha Pygocentrus nattereri and topmouth gudgeon Pseudorasbora parva achieving the lowest and highest certainty values, respectively, and with overall significant differences in certainty between assessors. The results of the present study indicate that FISK is a useful and viable tool for identifying potentially invasive non‐native fishes in Turkey, a country characterized by natural biogeographical frontiers.
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