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Journal Cover   Journal of Applied Ichthyology
  [SJR: 0.482]   [H-I: 36]   [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  [1611 journals]
  • Diel pattern of fish presence at the Changzhou fishway (Pearl River,
           China) during the flood season
    • Authors: J. P. Tao; X. Wang, X. C. Tan, Y.‐P. Cai, Y. Qiao, J.‐B. Chang
      Pages: n/a - n/a
      Abstract: Restoration of fish populations is required in China with the use of fishways at dammed rivers, but scant biological data is available for their design and operation. The Changzhou fishway (CFW) on the Pearl River is the largest in China, providing a channel for multispecies upstream migrations. This preliminary study used a combination of fish traps and hydroacoustic detection to document the diurnal presence of fish in the CFW, with the purpose of providing essential data for a future, solid performance of this fishway. Eighteen species from a total of 1362 fish individuals were collected in the traps. Three species were dominant, namely, Squaliobarbus curriculus, Pseudobagrus vachellii and Cirrhinus molitorella, altogether sharing proportions of 74.70 and 76.26% in the daytime and nighttime, respectively. Balanced by the up‐/downward movements of each fish, they entered the fishway with net numbers of 339.9 ± 113.4 ind.h−1, and exited with net numbers of 234.54 ± 26.66 ind.h−1. In diel fishway use, no significant differences were observed in either species composition or individual size during a diurnal period. Fish presence at the monitored sites within the fishway was recorded primarily during the daytime, showing a particular trend towards crepuscular use at the entrance and an uninterrupted use at the exit. This initial study showed a significant fish presence in the CFW during the flood season; the outcome of the study will be the basis of future research aimed at evaluating the passage efficiency of the CFW and the use thereof in other seasons.
      PubDate: 2015-02-10T04:38:38.537674-05:
      DOI: 10.1111/jai.12706
  • Occurrence of the Erythrean invader Pteragogus pelycus Randall, 1981
           (Teleostei: Labridae) in the eastern Aegean sea
    • Authors: H. H. Yapici; S. Yapici, S. Agdamar, U. Acar
      Pages: n/a - n/a
      Abstract: The occurrence of the Erythrean fish Pteragogus pelycus, off Kusadasi Bay, Turkey, eastern Aegean Sea, is here reported for the first time. One specimen was collected and it is now maintained in aquarium. The finding shows that its population is expanding northwards, along the Anatolian coasts of the Aegean Sea, approaching the colonization of the whole south and central basin.
      PubDate: 2015-02-10T04:26:34.20452-05:0
      DOI: 10.1111/jai.12705
  • Length‐weight relationships of eleven fish species from the middle
           reaches of Jinsha River, southwest China
    • Authors: L. Pan; W. T. Li, J. J. Xie, Y. F. Que, N. Zhao, Z. Yang, H. Y. Tang, C. Dong, J. L. Qin, Y. Qiao
      Pages: n/a - n/a
      Abstract: Length‐weight relationships (LWRs) were determined for eleven endemic fish species [Coreius guichenoti (Sauvage & Dabry de Thiersant, 1874), Glyptothorax sinensis (Regan, 1908), Leptobotia elongata (Bleeker, 1870), Leptobotia taeniops (Sauvage, 1878), Pseudobagrus crassilabris (Günther, 1864), Rhinogobio ventralis (Sauvage & Dabry de Thiersant, 1874), Saurogobio dabryi (Bleeker, 1871), Schizothorax chongi (Fang, 1936), Schizothorax kozlovi (Nikolskii, 1903), Schizothorax prenanti (Tchang, 1930) and Schizothorax wangchiachii (Fang, 1936)] from the middle reaches of the Jinsha River in southwest China. Samples were obtained between May 2004 and July 2013 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. Prior to this study, the LWRs for four species (P. crassilabris, S. chongi, S. kozlovi and S. prenanti) were unknown.
      PubDate: 2015-02-06T04:16:27.281477-05:
      DOI: 10.1111/jai.12684
  • Additional record of the Lessepsian Apogon queketti Gilchrist, 1903
           (Osteichthyes: Apogonidae) from the Aegean Sea (Gökova Bay, Turkey)
    • Authors: O. Akyol; V. Ünal
      PubDate: 2015-02-05T01:01:34.876847-05:
      DOI: 10.1111/jai.12702
  • Dynamics of biannual spawning behavior in rainbow trout Oncorhynchus
           mykiss (Walbaum, 1792) from southern Chile
    • Authors: N. Colihueque; F. Estay, C. Araneda
      PubDate: 2015-02-05T01:00:07.25694-05:0
      DOI: 10.1111/jai.12697
  • Improving the performance of a grid used in Norway lobster fisheries
    • Authors: N. Madsen; P. Lewy, J. Feekings, L. A. Krag, R. Frandsen, K. Hansen
      PubDate: 2015-02-05T00:58:06.968986-05:
      DOI: 10.1111/jai.12693
  • Age and growth of Boops boops (Linnaeus, 1758) in Izmir Bay, Aegean Sea,
    • Authors: A. Kara; B. Bayhan
      Abstract: The present study was conducted to determine the age relationships in lengths and weights of Boops boops (Linneaus, 1756) in Izmir Bay, central Aegean Sea. A total of 932 specimens (503 females and 429 males) were caught by gillnet, trammel net and a combination thereof on a monthly sampling basis from November 2008 through October 2009. Total length and weight of sampled fish ranged from 11.3 to 27.9 cm and from 12.2 to 261.7 g, with a mean of 19.6 cm and 82.7 g, respectively. Length‐weight relationships for all individuals were described by the parameters a = 0.0050, b = 3.237 and r² = 0.956. The von Bertalanffy growth curve fitted to the lengths‐at‐age provided parameters of L∞ = 29.87 cm k = 0.243 and to = −0.98 for males and L∞ = 30.79 cm, k = 0.239 and to = −0.90 for females. Based on otolith readings, age determinations varied from 1 to 5 years. Maximum age was 5 years in age group 2, with 29.84 and 37.97% for males and females, respectively. The overall 1 : 1.17 sex ratio of males to females was significantly biased toward females (P  0.05), with a value of 1.028 for the entire population. The growth performance index (Φ’) was 2.33 and 2.36 for males and females, respectively. Results were similar to other geographical areas, which suggests that a common fisheries management might be possible.
      PubDate: 2015-02-05T00:47:55.823216-05:
      DOI: 10.1111/jai.12680
  • Concurrence of inverted‐papilloma and papilloma in a gold spot pleco
           (Pterygoplichthys joselimaianus Weber, 1991)
    • Authors: H. Rahmati‐holasoo; S. Shokrpoor, H. A. Ebrahimzadeh Mousavi, M. Ardeshiri
      PubDate: 2015-02-03T00:31:17.139183-05:
      DOI: 10.1111/jai.12701
  • Length‐weight relationships for 22 neotropical freshwater fishes
           from a subtropical river basin
    • Authors: E. L. Silveira; A. M. Vaz‐dos‐Santos
      Abstract: This paper presents length‐weight relationships (LWR) for 22 species from the Pitangui River Basin, Brazil. For six of these species these are the first LWR records; for nine other species these are the first LWRs recorded in FishBase.
      PubDate: 2015-02-03T00:28:50.755958-05:
      DOI: 10.1111/jai.12699
  • Length–weight relationships of 21 fishes from the Xiangjiang River,
    • Authors: J. Lei; F. Chen, J. Tao, W. Xiong, Y. F. Chen
      Abstract: This paper provides the length–weight relationships for 21 fish species belonging to four families and 19 genera from the Xiangjiang River, a tributary of the middle Yangtze River in China. Among them, the length–weight relationships for 14 fishes are first‐time reports for FishBase, and new maximum total lengths of 13 fishes are also reported.
      PubDate: 2015-02-03T00:27:55.722035-05:
      DOI: 10.1111/jai.12700
  • Age and growth of Arno goby, Padogobius nigricans (Canestrini, 1867), in
           the Aggia River (Umbria, Central Italy)
    • Authors: L. Pompei; D. Giannetto, M. Lorenzoni
      Abstract: In this study, data of Padogobius nigricans, a species endemic to Central Italy, were used to assess the age, growth parameters and condition of this species. Length–weight relationships are also provided and represent the first available reference in the literature for the Arno goby. Data were collected in the Aggia River, a tributary of the Tiber River, by monthly samplings. A total of 780 specimens ranging in size from 1.5 to 9.2 cm were analyzed. Age was assessed by examination of scales, with the maximum age of 4+  years observed in males and 3+ in females. Previous growth was determined by back‐calculation of scale measurements. The von Bertalanffy growth parameters were estimated separately for sexes (males: L∞ = 9.759 cm, k = 0.505, t0 = 0.025, Ф′ = 1.682; females: L∞ = 8.989, k = 0.458, t0 = 0.028; Ф′ = 1.599). Evidence of growth differences between sexes was found, with males living longer and reaching larger sizes. Using the relative condition factor, condition was lower in females than in males, especially during the breeding period due to the strain of high reproduction. Competition with the congeneric P. bonelli, a species endemic to Northern Italy that was introduced in Central Italy, seems not to have been disadvantaged directly by the growth of P. nigricans in the Aggia River, since no selective size‐mortality occurred in the population.
      PubDate: 2015-02-02T23:58:13.033347-05:
      DOI: 10.1111/jai.12689
  • Spawning, maturity, growth and movement of Platycephalus fuscus (Cuvier,
           1829) (Platycephalidae): fishery management considerations
    • Authors: C. A. Gray; L. M. Barnes
      Abstract: The dusky flathead (Platycephalus fuscus) is an important teleost harvested by recreational and commercial fishers throughout its endemic distribution along eastern Australia. This study indicates that the species has an extended spawning period throughout the austral summer, with females in spawning condition occurring in lower estuarine and coastal waters. Total length (L50) and age (A50) at which 50% (±1 SE) of the population was mature was 31.72 (±1.08) cm TL and 1.22 (±0.44) years for males and 56.75 (±0.60) cm TL and 4.55 (±0.13) years for females. The von Bertalanffy growth parameters differed significantly between sexes; females grew faster and attained a greater maximum TL and age than males. The largest female was 98.5 cm TL (7.5 kg), and the oldest 16 years, whereas the largest male was 61.5 cm TL (1.58 kg) and 11 years of age. A tag‐and‐release study identified the exchange of sub‐adult and mature‐sized individuals among estuaries. Determinations of length‐based management regulations for the species are compounded by the large gender‐based differences in growth and length‐at‐maturity. Current minimum legal lengths of 30–40 cm TL protect approximately 3–9% of the female spawning population. Alternative management options, including harvest slot sizes, need to be investigated and tested.
      PubDate: 2015-01-30T04:22:53.737602-05:
      DOI: 10.1111/jai.12703
  • Analysis of length‐weight relationship of sympatric hill stream
           teleosts Barilius bendelisis (Hamilton, 1807) and Barilius vagra
           (Hamilton, 1822) from Garhwal Himalaya, India
    • Authors: J. I. Mir; R. S. Patiyal, N. K. Sharma
      Abstract: The present study describes the length–weight relationships (LWRs) of two important ornamental hill stream fishes, Barilius bendelisis and Barilius vagra (Hamilton), of northern India. A total of 630 specimens were collected from January to June 2011 in a spring‐fed stream in Garhwal Himalaya, India. Information regarding LWRs of these species was not yet available in FishBase.
      PubDate: 2015-01-30T04:12:33.965684-05:
      DOI: 10.1111/jai.12688
  • Effects of an artificial and annual opening of a natural sandbar on the
           fish community in a coastal lagoon system: a case study in Lagoa do Peixe
           floodplains, southern Brazil
    • Authors: L. E. K. Lanés; A. S. Rolon, C. Stenert, L. Maltchik
      Abstract: Two hypotheses were tested: that the artificial sandbar opening decreases the richness, diversity and abundance of fishes and alters the fish composition in floodplain ponds; that the salinity variations influence fish richness, diversity, abundance, as well as composition. Results suggest that artificial sandbar openings did not reduce the richness or diversity of freshwater fishes in southern Brazil floodplain ponds. Nevertheless, this process causes an increase in salinity, which determines significant differences in species composition between natural and managed areas. In this sense, the artificial sandbar opening must be considered with caution, since the area of study is one of the most important conservation units in wetland systems of southern Brazil.
      PubDate: 2015-01-29T23:56:18.128245-05:
      DOI: 10.1111/jai.12687
  • Length–weight relationship of two restricted‐range fish
           species from central Brazil highlands: Hyphessobrycon coelestinus Myers,
           1929 and Hasemania crenuchoides Zarske & Géry, 1999 (Characidae:
    • Authors: P. P. U. Aquino
      Abstract: This study presents length‐weight relationships (LWR) for two species of the family Characidae (Characiformes), Hyphessobrycon coelestinus and Hasemania crenuchoides, captured in the central highlands of Brazil.
      PubDate: 2015-01-29T23:41:31.215504-05:
      DOI: 10.1111/jai.12679
  • Effects of salinity on survival, daily food intake and growth of juvenile
           round goby Neogobius melanostomus (Pallas, 1814) from a brackish water
    • Authors: M. Hempel; R. Thiel
      Abstract: The growth response of juvenile round gobies was tested in various salinities to assess the potential performance of the species in widely differing salinities in the Baltic Sea and adjacent waters. An experimental approach analysed the survival, daily food intake and growth of juvenile Neogobius melanostomus from the brackish water region of the Kiel Canal, Germany. Round gobies (TL = 61.5 ±5.3 mm; n = 40) were fed ad libitum (diet = mysid shrimp; energy content = 4.7 cal per mg dry weight) at salinity levels of 0.1, 7.5, 15 and 30 over 12 weeks. Two replicate tanks (125 × 30 × 30 cm; 100 L) were maintained for each salinity level, each holding five specimens at a mean temperature of 19.90°C (±0.64°C; n = 136). Survival at all levels was 100%, except for 0.1 with 90%. Mean daily food intake (% of body weight) increased from salinity level 0.1 to 15 (from 17.76% to 19.95%); specimens at level 30 showed a more diversified and lower mean food intake (18.44%). Mean cumulative body weight gain appeared greatest at a level of 7.5 (224.52%), closely followed by 0.1 (206.57%) and 15 (191.92%). In contrast, fish growth was significantly lower at a salinity level of 30 (100.57%). Results of the experiment indicate that salinity tolerance estimates of the round goby made by other authors are too low regarding specimens that stem from brackish habitats. Growth patterns of some specimens, even in the salinity 30 treatment, show that a further spread of this species into regions with higher salinities is quite possible.
      PubDate: 2015-01-29T00:22:55.655877-05:
      DOI: 10.1111/jai.12696
  • Rapid response of invasive round goby (Neogobius melanostomus) (Pallas,
           1814) to an environmental perturbation demonstrated in reproductive
           parameters of females
    • Authors: K. Hôrková; V. Kováč
      Abstract: Plasticity in life‐history traits appears to be very important for adaptation of invasive species to a novel environment. Predictable changes in life‐history traits have been observed in the progression of invasions in several fish species. Nevertheless, the novel environment of the invaded areas can pose a challenge to the invaders caused by sudden perturbations in the ecological conditions. The aim of this study was to examine whether a sudden environmental disruption would reflect in significant changes in the reproductive parameters of the females of an invasive round goby (Neogobius melanostomus) population. Samples were collected from the middle section of the River Danube (Bratislava, Slovakia) from the 2008 post‐spawning period to the end of spawning in 2010. The results support the prediction that after a strong environmental perturbation, the females increase their absolute as well as relative numbers of oocytes and their real absolute fecundity; the differences in all of these parameters were statistically significant. Another strong environmental disruption occurred in June 2010, although the response differed from that of 2009. In 2009, the females responded by increasing their oocyte numbers; in 2010, they extended their reproductive season by producing an extra batch of eggs. This can be explained by the different timing of the sudden perturbations. In summation, a coincidence between the environmental perturbations and the significant changes in their reproductive traits was found in the round goby females in the two subsequent years. This indicates that the round goby can respond rapidly to environmental disruptions, and that such reproductive flexibility likely helps the species in its successful invasions.
      PubDate: 2015-01-29T00:22:05.965652-05:
      DOI: 10.1111/jai.12690
  • Length‐weight relationships of five fish species collected from
           Ranganadi River (Brahmaputra River tributary) in Assam, India
    • Authors: G. Kaushik; M. K. Das, J. F. Hussain, S. Bordoloi
      Abstract: Length‐weight relationships (LWR) are presented for five fish species: Laubuka laubuca (Hamilton, 1822); Aspidoparia jaya (Hamilton, 1822); Channa gachua (Hamilton, 1822); Acanthocobitis botia (Hamilton, 1822) and Badis badis (Hamilton, 1822) collected from the Ranganadi River in the Lakhimpur district of Assam, India. There were no prior LWR data regarding three of these species.
      PubDate: 2015-01-27T00:50:23.311546-05:
      DOI: 10.1111/jai.12691
  • Effects of supplementing the diets of Mugil liza Valenciennes, 1836
           juveniles with citrus pectin
    • Authors: L. R. V. Ramos; J. M. Monserrat, L. A. Romano, L. A. Sampaio, P. C. Abreu, M. B. Tesser
      Abstract: The aim of this study was to evaluate whether increasing the levels of citrus pectin has anti‐nutritional effects when included in the diets of Mugil liza juveniles, including its effects on hepatic metabolism and modulation of the microbial community. Fish (mean weight 0.38 g ± 0.01) were stocked at a density of 15 fishes per tank and fed for 60 days with either a control diet or one of three diets containing different levels of pectin (4, 8 and 12%), in triplicates. The temperature, dissolved oxygen, pH, salinity and alkalinity during the trial were, respectively, 25.0°C ± 0.1, 6.82 ± 0.02 mg L−1, 8.10 ± 0.06 and 147 mg ± 12.93 CaCO3. The total ammonia‐nitrogen (TAN) in PC4, PC8 and PC12 treatments were, respectively, 0.69 ± 0.38; 0.57 ± 0.35; 0.64 ± 0.39 and 0.45 ± 0.23 mg L−1. The increasing diet viscosity with pectin inclusion did not cause significant differences in growth. Fish fed with pectin demonstrated a reduction in their percentage body dry matter, crude protein and ash. Hepatic glycogen levels were elevated in the group fed with 12% pectin, while there were no effects in cholesterol and triglycerides levels. Citrus pectin did not exert any modulatory effect on the microbial community. Although the pectin‐supplemented fish showed enteritis during the experimental period, this did not impair animal performance. However, the use of this polysaccharide as a binder in mullet (Mugil liza) diets for longer periods should be considered with caution.
      PubDate: 2015-01-24T00:19:07.659112-05:
      DOI: 10.1111/jai.12695
  • Survival of farmed, wild and first generation hybrid Atlantic salmon
           (Salmo salar Linnaeus, 1758) to low temperatures following seawater
    • Authors: D. Hamoutene; I. Costa, K. Burt, L. Lush, J. Caines
      Abstract: In Newfoundland and Labrador, all farmed Atlantic salmon originate from the Saint John River strain (New Brunswick), raising the question of impacts of escapees on wild, genetically distinct stocks. While adverse genetic changes due to hybridization between farmed and wild salmon might not be manifested until the second generation (F2), the existence of F2 or later generations depends ultimately on the survival of F1 hybrids. After smoltification, cold spring seawater temperatures (1.5–5°C) such as those observed on the south coast of Newfoundland can be problematic to salmon as the combination of abrupt seawater exposure and cold temperature is known to overwhelm osmoregulatory mechanisms. No significant differences in total mortality were observed among wild, farmed and F1 hybrids after transfer to seawater and exposure to very cold temperatures. Our findings suggest that farmed salmon and F1 hybrids resulting from crossing wild salmon and St John River farm salmon are as likely to survive seawater migration in cold temperatures as their wild counterparts.
      PubDate: 2015-01-24T00:17:50.06229-05:0
      DOI: 10.1111/jai.12694
  • A combination of corn gluten and soybean meal as a substitute for fishmeal
           in diets of turbot (Scophthalmus maximus Linnaeus, 1758) in brackish water
    • Authors: H. Sevgili; A. Kurtoğlu, M. Oikawa, A. Aksoy, S. Kocakaya, E. Öztürk, R. Uysal, H. Gündüz Oruç
      Abstract: This study was conducted to test the replacement of fishmeal (FM) with a combination of corn gluten meal (CGM)‐soybean meal (SBM) (at a ratio of 58 : 42, respectively) fortified with lysine, taurine and monocalcium phosphate (MCP) in turbot (Scophthalmus maximus) diets. FM as the main protein source in the control diet (FM100) was replaced in 15% decrements while increasing the combination of replacement material: 85% FM (FM85), 70% FM (FM70), 55% FM (FM55) and 40% FM (FM40). The diets were fed to triplicate groups (n = 25 per group) for 9 weeks (water temperature, dissolved oxygen, pH and salinity of 18.59 ± 0.06°C, 7.32 ± 0.02 mg L−1, 7.73 ± 0.01 and 8.46 ± 0.04 g L−1, respectively). Initial weight of fish was 286.1 ± 0.1 g. At the end of the experiment, growth, feed and nutrient utilization performance of fish fed FM85 and FM70 were similar to FM100, but a further increase in plant protein led to a significant reduction of these parameters. Whole body, fillet, viscera and liver nutrient compositions were not affected significantly; however, whole body lipid levels were significantly lower in fish on FM55 and FM40 than those on FM100. The fish in–fish out ratio in the diets decreased from 2.12 in FM100 to 1.00 in FM40. The results suggest that the FM level could be reduced by 30% with a combined use of CGM‐SBM supplemented with lysine, taurine and MCP.
      PubDate: 2015-01-23T23:58:10.682193-05:
      DOI: 10.1111/jai.12683
  • Length–weight and length–length relationships of 11 fish
           species from Zhimai River estuary, China
    • Authors: L. J. Wang; F. You, Q. X. Wang, Z. H. Wu, M. X. Liu
      Abstract: The present work provides the length–weight relationships (LWRs) and total length – standard length relationships (LLRs) of 11 fish species belonging to six families. The fishes were collected from seasonal bottom trawl surveys in the Zhimai River estuary, March 2011 to May 2013. This is the first record of LWRs and LLRs for several of the fish species in this area.
      PubDate: 2015-01-23T23:57:50.074965-05:
      DOI: 10.1111/jai.12692
  • Shark bycatch in the experimental tuna longline fishery in Lakshadweep
           Sea, India
    • Authors: K. V. Aneesh Kumar; P. Pravin, B. Meenakumari, P. S. Khanolkar, M. V. Baiju
      Abstract: Studied were the bycatch from the experimental longline fishing operations in the Lakshadweep Sea. The experiments were conducted on converted Pablo boats, originally used for pole and line fishing operations, to capture skipjack tuna in the Lakshadweep Islands. The overall bycatch rate was very high, with a mean hooking rate of 8.05/1000 hooks compared to the targeted tuna catch (1.75/1000 hooks). Bycatch contributed 82.4% of the catch in comparison to the tuna (17.6%) Thunnus albacares, in the longline operations. Silky shark (Carcharhinus falciformes) with 89.9% was the dominant shark species followed by C. amblyrhynchos, Galeocerdo cuvier, Alopias pelagicus, Negapriion acutedens and Sphyrna lewinii with 4.7, 2.7, 1.4, 0.7 and 0.7%, respectively. Sharks contributed to 74.1% of the catch, followed by 15.7% sailfishes and 10.2% miscellaneous fishes. Higher bycatch rates were evident during evening hours compared to mornings, but the results were not significant statistically. Studies on the effects of depth on the overall fishing performance and species selectivity failed to establish any significant relationship at a depth range of 35–100 m. Soaking time had a significant effect on bycatch rates. The hooking rate of sharks declined with an increase in soaking time. Considering the high shark bycatch in the fishery, an accurate monitoring of the longline fish catches in the Lakshadweep waters is an important step towards ensuring the sustainability of other populations, especially sharks.
      PubDate: 2015-01-23T23:57:14.103821-05:
      DOI: 10.1111/jai.12682
  • Length–weight relationships of 10 fish species from a Ganga River
           Basin tributary, Uttarakhand, India
    • Authors: J. I. Mir; R. S. Patiyal, P. K. Sahoo
      Abstract: Length‐weight relationships (LWRs) are described for 10 fish species belonging to three families from the Gaula River, a tributary of the Ganga River Basin in India. LWRs for these species were unknown to FishBase, and new maximum lengths are recorded for one species. These results will be useful for fishery research, management and conservation in the least‐explored tributary of the Ganga River Basin.
      PubDate: 2015-01-21T04:06:59.425746-05:
      DOI: 10.1111/jai.12686
  • Length–weight relationships of the silver European eel, Anguilla
           anguilla (Linnaeus, 1758), across its geographic range
    • Authors: C. Boulenger; A. Acou, T. Trancart, A. J. Crivelli, E. Feunteun
      Abstract: Length–weight relationships for European silver eel (Anguilla anguilla) sub‐populations in six countries (13 catchments) along the latitudinal gradient in the area of distribution in this study use three important sampling programs; these results concur with previous studies on European eel with the equation: W = 0.0010 L3.148 for the entire data set (sexes combined). Significant differences were observed among the 13 catchments, possibly implying differences in body condition. Male and female LWRs varied significantly between and among catchments, suggesting that the capacity of silver eels to migrate and reproduce successfully varies according to the sites.
      PubDate: 2015-01-21T04:03:37.165099-05:
      DOI: 10.1111/jai.12685
  • Improvement of fish length estimates for underwater visual census of reef
           fish biomass
    • Authors: I. Yulianto; C. Hammer, B. Wiryawan, S. T. Pardede, T. Kartawijaya, H. W. Palm
      Abstract: Accuracy and precision are of great importance in the assessment of reef fish biomass when conducting an underwater visual census (UVC). Quantification and subsequent correction of the bias is required in order to standardize the estimates and correct for underwater distortion. To optimize the UVC, the observer should receive length‐measurement training in order to obtain in situ‐measurements that are as accurate and precise as possible. The objective of this study was to quantify the bias of fish length measurements made by divers with and without training in order to enhance reef fish biomass estimates. Adaptation of the diver to estimate fish lengths was analysed as a part of reef fish biomass monitoring in the Karimunjawa National Park, a national marine sanctuary in the Java Sea, Indonesia. Two divers practiced estimating a variety of fish in a natural environment by using styrofoam models attached to strings and sinkers. Analyses showed that by training the diver, his/her accuracy and precision improved substantially. Proving its reliability, an underwater visual census (UVC) becomes a useful and reliable method to assess the biomass of reef fishes.
      PubDate: 2015-01-16T05:58:38.501016-05:
      DOI: 10.1111/jai.12672
  • Fatty acid composition of Turbatrix aceti and its use in feeding regimes
           of Coregonus maraena (Bloch, 1779): is it really a suitable alternative to
           Artemia nauplii'
    • Authors: M. Hundt; J. Brüggemann, B. Grote, A. A. Bischoff, D. Martin‐Creuzburg, R. Gergs, B. H. Buck
      Abstract: By incorporating the free‐swimming nematode Turbatrix aceti into early feeding regimes of the European whitefish Coregonus maraena, the suitability of this nematode species was investigated as an alternative to Artemia nauplii. During a 14‐day feeding trial in a total of 25 aquaria each 1.7 L (each treatment n = 5, 255 larvae/tank) T. aceti was used either as the sole live food or in combination with Artemia nauplii or microdiet to determine the effect of T. aceti on growth performance and survival rate of C. maraena. By analysing the fatty acid composition of T. aceti prior to and after enrichment with INVE spresso® it was investigated whether the amount of n3‐polyunsaturated fatty acids (n3‐PUFA) in T. aceti could be further enhanced. Supplementation of Artemia nauplii with T. aceti increased growth significantly within the first 5 days of rearing in comparison to the non‐supplemented food treatments (14.39 ± 0.15 mm compared to 13.44 ± 0.18 mm; mean ± SE). However, growth and survival of juvenile C. maraena on nematode‐supplemented Artemia nauplii did not differ significantly from non‐supplemented Artemia nauplii at the end of the 14‐day rearing period (15.22 ± 0.15 mm compared to 14.86 ± 0.24 mm). All feeding treatments containing Artemia nauplii showed significantly higher growth and lower mortality at the end of the experiment in comparison to diets containing only the microdiet or T. aceti or a combination thereof. The overall low performance of T. aceti alone can most likely be explained by an insufficient capacity of C. maraena to digest this nematode species efficiently. Enrichment with INVE spresso® successfully increased the proportion of DHA in the T. aceti tissue. The results reveal that T. aceti cannot be considered a full alternative to Artemia nauplii, at least not in the rearing of C. maraena, but might be a useful vector of essential fatty acids within the early rearing period of this and potentially other fish species when provided as live food along with Artemia nauplii.
      PubDate: 2015-01-14T01:35:20.915175-05:
      DOI: 10.1111/jai.12668
  • Effects of formalin preservation on eye lens of bogue, Boops boops
           (Linnaeus, 1758): comparison of direct (post‐fixation) vs ultrasound
           (true) measurements
    • Authors: F. Macrì; A. Passantino, S. Di Pietro, D. Ruscica, A. Sfacteria, C. De Stefano, T. Bottari
      PubDate: 2015-01-12T00:42:53.770813-05:
      DOI: 10.1111/jai.12678
  • New insights to discriminate between Sympterygia acuta Garman 1877
           and Sympterygia bonapartii Müller & Henle, 1841 (Rajidae) of
           the Southwest Atlantic Ocean: on the use of geometric morphometrics and
           spinulation patterns
    • Authors: P. Orlando; M. González‐Castro, E. Mabragaña
      Abstract: Geometric‐morphometric and spinulation pattern approaches were employed to assess the discrimination of two species of Sympterygia skates in the Southwest Atlantic: Sympterygia acuta Garman 1877 and Sympterygia bonapartii Müller & Henle, 1841. Two types of variables were employed: linear morphometrics measurements (LMMs), and interlandmark distances (IlDs). The Principal Component Analysis (PCA) and the discriminant analysis (DA) do not overlap between the species. Morphometrically, S. bonapartii is characterized by a wider disc, larger pelvic fins, larger eyes, a greater distance between nostrils and between the first pair of gill slits, a greater interorbital distance between spiracles, and a wider mouth. On the other hand, S. acuta has a larger disc due to the snout size. Regarding the allometric coefficient analysis performed on the IlDs, S. bonapartii showed a positive allometry for the variables that comprise the Box‐Truss 3 (Ventral protocol), which can be related to the mouth width and the first gill slits. This growth type is consistent with those observed in the Box‐Truss 3 (Outline protocol), which is related to the disc width. It has been interpreted that both structures could develop together. In opposition, S. acuta showed isometric growth for the above‐mentioned variables; on the other hand, S. acuta showed positive allometry for all variables that defined the snout in the three protocols, indicating that the snout has a distinctive growth relative to the size through ontogeny. S. bonapartii, however, showed an isometric snout growth. The remaining variables that defined the morphogeometrical protocols displayed the same type of growth. Regarding spinulation, the thorns and dermal denticles proved to be useful to discriminate both species. Thorns of the caudal region were large and oval with smooth edges in S. bonapartii, and oval with lobed edges in S. acuta. Dermal denticles in S. acuta also presented two elongated ridges with a third small ridge between them, whereas those of S. bonapartii presented three elongated ridges of the same size.
      PubDate: 2015-01-09T04:53:11.762896-05:
      DOI: 10.1111/jai.12674
  • Length‐weight relationships for 32 fish species in the Grijalva
           River Basin, México
    • Authors: E. Velázquez‐Velázquez; M. Maza‐Cruz, A. E. Gómez‐González, J. A. Navarro‐Alberto
      Abstract: Length‐weight relationships were estimated for 32 species belonging to 11 fish families from the Grijalva River, México. For 24 of the species, the length‐weight relationships are published for the first time.
      PubDate: 2015-01-09T04:41:00.563342-05:
      DOI: 10.1111/jai.12676
  • Length–weight and length–length relationships for 135 fish
           species from the Xingu River (Amazon Basin, Brazil)
    • Authors: T. Giarrizzo; R. R. Sena Oliveira, M. Costa Andrade, A. Pedrosa Gonçalves, T. A. P. Barbosa, A. R. Martins, D. K. Marques, J. L. Brito dos Santos, R. Paula da Silva Frois, T. P. Oliveira de Albuquerque, L. Fogaça de Assis Montag, M. Camargo, L. Melo de Sousa
      Abstract: Length–weight (LWR) and length–length relationships (LLR) are presented for 135 freshwater fish species sampled by several types of fishing gear between April 2012 and July 2014 in the middle and lower Xingu River Basin, northern Brazil. The report represents the first references on LWRs and LLRs for 114 and 119 species, respectively, and also provides a new maximum size for 96 species.
      PubDate: 2015-01-09T04:37:26.305234-05:
      DOI: 10.1111/jai.12677
  • Length‐weight relationships of six fishes from intertidal and
           coastal waters in the northern Persian Gulf
    • Authors: M. Aghajanpour; H. Raeisi, A. Moradinasab, M. Daliri, M. Parsa, M. Bibak, A. Nekuru
      Abstract: The length–weight relationships (LWRs) for six little‐known fish species collected in the northern Persian Gulf (south of Iran) are presented, namely, Plicofollis dussumieri, Pseudotriacanthus strigilifer, Cynoglossus bilineatus, Cynoglossus arel, Solea elongata, and Pseudorhombus elevates.
      PubDate: 2015-01-06T00:30:01.286616-05:
      DOI: 10.1111/jai.12656
  • Individual variations and interrelationships in feeding rate, growth rate,
           and spontaneous activity in hybrid tilapia (Oreochromis
           niloticus × O. aureus) at different feeding
    • Authors: G. F. Dong; Y. O. Yang, F. Yao, L. Chen, F. Y. Bu, P. C. Li, F. Huang, D. H. Yu
      Abstract: A 30‐day growth trial was conducted to investigate the individual variations in feeding rate, growth rate, spontaneous activity, and their possible interrelationships in hybrid tilapia (Oreochromis niloticus × O. aureus) reared individually at feeding frequencies of one and two meals daily. Results show that the feeding rate in energy (FRe), specific growth rate in energy (SGRe), and food conversion efficiency (FCE) of fish fed twice a day were significantly higher than that of fish fed only once. However, no significant differences in distance or in time spent swimming were observed between the groups. SGRe was positively correlated with FRe in fish fed only once daily, and SGRe was positively correlated with food conversion efficiency in energy (FCEe) between the two groups. SGRe was only inversely correlated with the distance that fish swam when fed once daily. The results suggest that the individual growth differences of hybrid tilapia could be attributed mainly to variations in FRe, and that the energy costs of spontaneous activity play an important role in the differences at feeding frequency of one meal a day. However, at feeding frequencies of two meals a day, individual growth differences in fish may be caused by variations in FCEe, and energy costs of spontaneous activity have only marginal effects on the differences.
      PubDate: 2014-12-30T00:16:18.880975-05:
      DOI: 10.1111/jai.12669
  • Utility of fish scales from stock assessment surveys in stable isotope
           analysis for initial assessments of trophic relationships in riverine fish
    • Authors: T. Bašić; J. R. Britton
      Abstract: The utility of using fish scales collected during stock assessment exercises to assess the trophic relationships of riverine fishes using their stable isotopes of d13C and d15N was tested using three riverine fish communities in England (Rivers Great Ouse, Ivel and Goyt). In each river, European barbel Barbus barbus was an important species, with other cyprinid species, including chub Squalius cephalus, present. Stable isotope analyses was completed using relatively small sample sizes per species (
      PubDate: 2014-12-30T00:13:56.979111-05:
      DOI: 10.1111/jai.12671
  • Length‐weight relationships of three cyprinid fishes from headwater
           of the Nujiang River, China
    • Authors: D. K. He; W. Xiong, X. Y. Sui, Y. T. Jia, Y. F. Chen
      Abstract: Length‐weight relationships (LWR) for three cyprinid fish species collected from the headwaters of the Nujiang River in Tibet, China, were determined. The values of parameter b in the LWR equations were estimated as 2.54 for Schizopygopsis thermalis, 3.3 for Ptychobarbus kaznakovi, and 2.74 for Schizothorax nukiangensis, respectively. These are the first LWR records for the three species.
      PubDate: 2014-12-29T23:55:49.510991-05:
      DOI: 10.1111/jai.12670
  • Prey availability and selective feeding of sea trout (Salmo trutta L.,
           1758) fry stocked in small forest streams
    • Authors: J. Domagała; T. Krepski, R. Czerniawski, M. Pilecka‐Rapacz
      Abstract: The food base and stomach contents of stocked sea trout (Salmo trutta) fry were determined in the first 4 months (April–August 2010) of life in two small lowland streams after resorption of the yolk sac. In each stream, 600 individual trout were released in a 200 m stocking‐section. The macrozoobenthos given as a food base for the fry were collected once a month from the streams using a bottom scraper. Three subsamples of macrozoobentos were considered as one sample from the stocking‐section. On the same day, 50 stocked fry were captured in each stream using electric fishing gear. Preferred food components were usually the taxa represented by number in a given stream in a particular month. Width size range of the prey in fish stomachs in May was from 0.10 to 1.47 mm, and from 0.11 to 3.78 mm in August. All food items found in both streams during the study months were also represented in intensity in the fish: Cyclopoida, and larvae of Baetidae and Chironomidae. Almost all Helodidae and Simuliidae larvae as well as the majority of Limoniidae and Nemouridae larvae were available as food each month.
      PubDate: 2014-12-26T01:45:24.213013-05:
      DOI: 10.1111/jai.12673
  • Length–weight relationships of 20 fish species from Pahang River,
           Maran district, Pahang, Malaysia
    • Authors: A. R. Zulkafli; M. N. A. Amal, S. Shohaimi, A. Mustafa, A. H. Ghani, S. Hashim, M. I. Anuar, M. P. Hasfairi
      Pages: n/a - n/a
      Abstract: This study reports the length–weight relationships (LWR) of 20 fish species from the Pahang River, Maran district, Pahang, Malaysia. The river supplies fishes mainly for local consumption and is a principal body of water for freshwater aquaculture in Malaysia. A total of 12 LWR of fishes were unknown to FishBase, and five new maximum lengths of fishes were identified from the study.
      PubDate: 2014-12-19T04:37:38.761927-05:
      DOI: 10.1111/jai.12666
  • Effects of tank colour on feed intake, specific growth rate, growth
           efficiency and some physiological parameters of rainbow trout
           (Oncorhynchus mykiss Walbaum, 1792)
    • Authors: S. Rahnama; M. S. Heydarnejad, M. Parto
      Pages: n/a - n/a
      PubDate: 2014-12-19T04:31:19.815667-05:
      DOI: 10.1111/jai.12664
  • Effects of different food on growth and survival of first‐feeding
           taimen Hucho taimen (Pallas, 1773) larvae
    • Authors: C.‐A. Wang; J.‐Z. Ma, Q.‐Y. Xu, J.‐S. Yin, Z.‐G. Zhao, J.‐N. Li, L.‐S. Wang, L. Luo
      Pages: n/a - n/a
      Abstract: A study was conducted to compare growth and survival of Hucho taimen larvae from 21 to 76 days after hatch (DAH) fed one of three diets: formulated feed alone (group F); a co‐feeding diet of water fleas, tubifex and formulated feed (group C); or live food of water fleas and tubifex (group L), and to investigate the potential use of dietary L‐alanyl‐L‐glutamine (L‐AG) in larval taimen for a more nutritious starter diet. Triplicate groups of 5000 fish were randomly assigned to each aquarium provided with water from a flow‐through system, and fed to apparent satiation. The results show that larvae can feed efficiently on floating crumbled particles of formulated feed. Weight gain of larvae fed only formulated feed was significantly lower than other groups at 34 DAH (P 
      PubDate: 2014-12-19T04:25:52.048732-05:
      DOI: 10.1111/jai.12663
  • Population parameters of the fish fauna in a long‐established
           Amazonian reservoir (Amapá, Brazil)
    • Authors: J. C. Sá‐Oliveira; R. Angelini, V. J. Isaac‐Nahum
      Abstract: The present study focused on the fish fauna of the 44‐year‐old Coaracy Nunes reservoir in the northern Amazon basin, producing estimates of the growth constant (k), maximum and asymptotic body lengths and weights, natural mortality (M), the consumption/biomass ratio (QB) (intake of food by a group over a year), the Aspect ratio (Ar) of the caudal fin, growth performance (Φ), longevity, and trophic level for 45 fish species. Species collection was divided into eight sampling campaigns between May 2009 and July 2010. Gillnets were used in four of the sampling sites. The results revealed that (i) the most predominant species are Ageneiosus ucayalensis, Hemiodus unimaculatus, Serrasalmus gibbus and Geophagus proximus; (ii) small and medium‐sized fishes predominated in the community, characterized by high rates of growth and natural mortality, consistent with a predominance of r‐strategists; (iii) the body lengths of the detritivore species were similar to those of the piscivores, which are normally larger, but with higher growth rates, more similar to those recorded for the omnivores; (iv) consumption/biomass ratio (QB) × body length relationship is higher in the detritivores than in the omnivores and piscivores (which were similar to each other). Overall, the reservoir habitat appears to be advantageous to detritivorous fish species.
      PubDate: 2014-12-16T00:48:52.783068-05:
      DOI: 10.1111/jai.12667
  • Occurrence of Pseudocorynopoma heterandria Eigenmann, 1914 (Characidae) in
           Paraíba do Sul River Basin (Southeastern Brazil)
    • Authors: F. L. K. Salgado; B. F. Terra, G. S. Camilo, E. O. Silva, F. G. Araújo
      PubDate: 2014-12-15T06:56:46.386487-05:
      DOI: 10.1111/jai.12657
  • Length–weight relationships and biological data on guayana
           pike‐conger Cynoponticus savanna (Bancroft, 1831)
    • Authors: J. A. Reis‐Filho; L. Specht
      Abstract: This study presents the first references available for Cynoponticus savanna length–weight relationships (LWR) as well as other biological information, based on its unique population in the South Atlantic Ocean, specifically, Todos os Santos Bay, on the Brazilian central coast. A total of 464 individuals were obtained from artisanal fishing landings between July 2012 and June 2013. Total lengths ranged from 14.5 to 139.6 cm. The length‐weight relationship was BW = 0.716 TL3.31. Length at first maturity (Lm) was 48.9 cm. Reproduction began gradually in May, reaching a peak around December, with most individuals completing reproduction by January. The gonadosomatic index (GSI) was highest in January (GSI = 0.21) and lowest in March (GSI = 0.024). The male index (GSI = 0.073) was lower than in females (GSI = 0.10) (P 
      PubDate: 2014-12-15T06:51:30.707136-05:
      DOI: 10.1111/jai.12662
  • Relationship between Fulton's condition factor and proximate body
           composition in three freshwater fish species
    • Authors: A. Mozsár; G. Boros, P. Sály, L. Antal, S. A. Nagy
      Abstract: Morphometric‐based condition indices are widely used to assess proximate body composition and, collaterally, feeding and living conditions of fish. However, the exact relationship between condition indices and proximate body composition of fish and its relatedness to life history traits and seasonality has yet to be fully explored. Therefore, the aim of this study was to examine how the Fulton's condition factor (K‐factor) is related to the chemical composition (i.e. lipid, protein, water and carbon content, and molar carbon : nitrogen ratio), length and gonadal development of fish, and how these relationships are influenced by gender and seasonality in three freshwater fish species: Amur sleeper (Perccottus glenii), pumpkinseed (Lepomis gibbosus) and rudd (Scardinius erythrophthalmus). It was found that the strength and direction of association between the K‐factor and proximate body composition can vary markedly among fish species. The K‐factor correlated positively with gonadal development in pumpkinseed and Amur sleeper, while no such relationship existed in rudd. Condition factor can be a reliable measure of lipid content; however, the relationship was stronger in species with higher and more variable lipid contents. Moreover, a striking and consistently negative linkage was found between the K‐factor and water content of the fish body, which corresponds to the findings of several other studies. In turn, any relationship between the K‐factor and the protein content of fish was not detected. Gender seemed to exert a negligible effect on the relationship between the K‐factor and proximate body composition, while seasonal variance was obvious in most relationships.
      PubDate: 2014-12-08T02:17:30.895627-05:
      DOI: 10.1111/jai.12658
  • Implications for catch composition and revenue in changing from diamond to
           square mesh codends in the northeastern Mediterranean
    • Authors: A. R. Eryaşar; H. Özbilgin
      Abstract: The objective of this study was to estimate the potential short‐term economic loss as a result of replacing the commercial diamond codend with a square mesh codend, and to compare fish lengths captured in 40 mm square (S40) vs 44 mm commercial hand‐woven diamond (CD44) mesh codends for red mullet (Mullus barbatus), common pandora (Pagellus erythrinus), bogue (Boops boops), European hake (Merluccius merluccius), axillary seabream (Pagellus acarne), and brushtooth lizardfish (Saurida undosquamis). A total of 20 hauls (10 hauls for S40 and 10 hauls for CD44) were conducted onboard a commercial trawler between 27 February and 11 April 2012 in Mersin Bay in the northeastern Mediterranean. Results showed that the 40 mm square mesh codend caught significantly fewer juveniles of all aforementioned species. However, when changing from the commercial diamond codend to the 40 mm square mesh codend the potential economic loss of revenue was found to be 40% in the study period, which covered the final 6 weeks of the fishing season.
      PubDate: 2014-12-02T07:04:21.71497-05:0
      DOI: 10.1111/jai.12643
  • Short‐term effect of selectivity change in a trawling fishery in the
           Western Mediterranean
    • Authors: M. Samy‐Kamal; A. Forcada, J. L. Sánchez Lizaso
      Abstract: The change of mesh size or shape as a management measure to improve selectivity as proposed by the EU should be assessed using actual fishery data, despite being tested experimentally in previous studies. This work was conducted to evaluate the consequences of inserting either a 40‐mm square‐mesh or a 50‐mm diamond‐mesh (instead of the traditional 40‐mm diamond‐mesh) at codends in commercial Spanish trawlers. Landings in terms of biomass, income and catch composition were compared under commercial conditions. Four métiers were identified in the fishery: European hake (Merluccius merluccius), red mullet (Mullus barbatus), red shrimp (Aristeus antennatus) and Norway lobster (Nephrops norvegicus). No significant differences were observed in biomass or income owing to the new mesh in either European hake or red mullet. In contrast, the total biomass of the red shrimp métier and the biomass of the Norway lobster, Nephrops norvegicus, were significantly higher after the selectivity change. Regarding the catch composition, only the European hake métier showed slight – but not significant – changes after using the new mesh. Considering these results, there was no short‐term effect (substantial biological or economic loss) as previous studies had expected. This could possibly be related to a higher performance of the new gear that may compensate for the lower retention of small sizes.
      PubDate: 2014-11-10T01:12:08.769178-05:
      DOI: 10.1111/jai.12630
  • First length–weight relationships of 11 fish species in the Aegean
    • Authors: S. Yapici; P. K. Karachle, H. Filiz
      Abstract: Weight‐length relationships were established for eleven marine fish species caught in the SE Aegean Sea, Turkey. Additionally, a bibliographic review of such relationships for these species was conducted. Based on the results, the values of b parameter varied between 2.477 and 3.496, with one species having isometric growth, five negative and six positive allometric growth. Furthermore, for Aulopus filamentosus there exist no information in the literature, whilst for Callanthias ruber and Gnathophis mystax, there are no such information available from the Mediterranean.
      PubDate: 2014-07-28T06:03:56.7133-05:00
      DOI: 10.1111/jai.12459
  • Spatiotemporal occurrence and feeding habits of tonguefish, Cynoglossus
           lighti Norman, 1925, larvae in Ariake Bay, Japan
    • Authors: G. Kume; K. Furumitsu, H. Nakata, T. Suzuki, M. Handa, A. Yamaguchi
      Abstract: Spatiotemporal occurrence and feeding habits of tonguefish (Cynoglossus lighti Norman, 1925) larvae were investigated in an offshore area (>5 m in depth) of the inner part of Ariake Bay, Japan. All specimens were symmetric, free‐swimming larvae. Although their seasonal abundance and distribution in the study site varied from year to year, spawning started in June and the larval abundance was high in August and September with a wide distribution in the inner part of the bay. Both present and previous study results strongly suggest that larvae may settle primarily in the estuary and near‐shore areas of Ariake Bay after their wide distribution in the offshore area of the bay during the free‐swimming stage. Larvae showed a clear feeding rhythm in which they fed on prey mainly during the daytime. Larvae fed exclusively on copepods, and identified prey were mostly Paracalanidae (mainly Parvocalanus crassirostris), Microsetella norvegica, and Oithona davisae. Pre‐metamorphosis larvae fed primarily on Paracalanidae and O. davisae, whereas O. davisae formed a smaller proportion of the early‐metamorphosis diet. In early metamorphoses, larvae fed preferentially on Paracalanidae and M. norvegica.
      PubDate: 2014-07-10T02:45:21.155113-05:
      DOI: 10.1111/jai.12498
  • Species composition of benthic fish fauna in the Sea of Marmara, Turkey
    • Authors: H. Torcu Koç; F. Üstün, Z. Erdoğan, L. Artüz
      Abstract: In order to determine the present benthic fish fauna in the Sea of Marmara, sampling was conducted at a total of 10 stations for 2 weeks in August 2009, using a commercial twin beam trawling vessel with 18 and 36 mm stretched mesh sizes at the cod‐end. In addition, some physicochemical parameters that play important roles, such as temperature, salinity, dissolved oxygen, and pH, were measured for each station. As a result, 31 fish species from 23 families were found at a total of 10 stations in depths of 30–1000 m. At each station, the Shannon–Weaver diversity index, Simpson dominance index, species richness index, and evenness index were estimated. This study reports on species composition of the demersal fish catches in the Sea of Marmara for a preliminary assessment of the status of these fish communities.
      PubDate: 2012-07-18T00:31:57.14121-05:0
      DOI: 10.1111/j.1439-0426.2012.02037.x
  • A checklist of the protozoan and metazoan parasites of European eel
           (Anguilla anguilla): checklist of Anguilla anguilla parasites
    • Authors: E. Jakob; T. Walter, R. Hanel
      Abstract: A comprehensive literature review on prevalence and distribution of parasites of the European eel (Anguilla anguilla) in European waters was conducted to set a baseline for future trend analyses and biodiversity considerations. The resulting checklist compiled from peer reviewed journals as well as grey literature including scientific reports, conference contributions, PhD theses and own survey data includes all protozoan and metazoan parasites of the European eel from freshwater, brackish and marine habitats. Parasites are arranged according to phylum and family. Species within families are listed alphabetically. Infected host organs, recorded habitats, localities, countries and literature citations are provided for each species. A total of 161 parasite species/taxa from 30 countries are listed. With the trypanorhynch cestode Tentacularia coryphaenae a new host record could be documented. Furthermore, three new locality records of parasitic nematodes could be added based on own survey data: Anisakis simplex from an eel caught in the Baltic Sea, Eustrongylides mergorum for German freshwaters, and Goezia anguillae from the Tagus estuary in Portugal. Special consideration was given to the distribution of the swimbladder nematode Anguillcoloides (Anguillicola) crassus. A map and table of first reported records of this neozoan parasite species for 25 countries as well as a survey map indicating all published localities documented in the checklist are provided.
      PubDate: 2009-11-25T00:00:00-05:00
      DOI: 10.1111/j.1439-0426.2009.01345.x
  • Length–weight relationships and biological data of Odontobutis
           sinensis (Wu, Chen & Chong, 2002) from Liangzi Lake, China
    • Abstract: This study provides the first biological information on a small freshwater benthic fish species Odontobutis sinensis (Wu, Chen & Chong, 2002) from Liangzi Lake, China. The length‐weight relationship was BW = 0.0080TL3.23. The male : female sex ratio was 1.56 : 1. Based on the gonadosomatic index (GSI), the spawning season is from April to June. Females first matured at 7.90 cm total length (TL). Absolute fecundity varied from 346 to 2588 eggs. Main food items consisted of crustaceans and smaller fishes.
  • Length–weight relationship of 37 fish species from the Taquari River
           (Paranapanema Basin, Brazil)
    • Abstract: This work describes the length–weight relationship (LWR) of 37 fish species from the Taquari River, one of the tributaries of the Jurumirim Reservoir in the high Paranapanema Basin, São Paulo, Brazil. Information was not yet available in FishBase on LWRs of 22 of the fish species and maximum weights (Wt) of 24 of the fish species. New maximum standard lengths are presented for nine species as well as weights for two fish species.
  • Length‐weight relationships of 58 fish species in French Guiana
    • Abstract: Length‐weight relationship parameters of the form W = aLb are presented for 58 fish species representing 36 genus and 19 families captured in streams of French Guiana. LWRs for 53 of the species are estimated for the first time.
  • Identification ability of tetraploid microsatellite loci in parentage
    • Abstract: An anadromous fish, the Chinese sturgeon (Acipenser sinensis Gray) is included in the 1996 IUCN Red List of Threatened Species. To save populations from extinction, artificial propagation had been sought since the 1980s and was achieved in 2009. Additional genetic information and methods will become crucial components in genetic management of the residual A. sinensis population. Microsatellite markers can provide information on the family structure, to avoid inbreeding or founder effects. However, the polyploidy derivative nature of the A. sinensis genome has added difficulties in settling these problems. Given the costs associated with genetic data collection, the trade‐off between the amount of molecular data (how many loci are needed and which loci should be used) and the number of individuals sampled warrants consideration in order to maximize both efficiency and parentage analysis. Formulas to calculate the resolving power for tetraploid microsatellite loci in a given population are provided; these formulas are adapted from those fitted to the diploid loci in Neff et al. (Mol. Ecol., 9, 2000a, 515) and require genetic data only from the parent or parents in question, and an estimate of population allele frequencies. These formulas will help in addressing practical problems, such as the choice of genetic loci in A. sinensis conservation aquaculture programs.
  • Eelgrass, Zostera marina, as essential fish habitat for
           young‐of‐the‐year winter flounder, Pseudopleuronectes
           americanus (Walbaum, 1792) in Maine estuaries
    • Abstract: Distribution and density by habitat for age‐0, young‐of‐the‐year (YOY) winter flounder, Pseudopleuronectes americanus (Walbaum, 1792), were compared for two Maine estuaries to help define essential fish habitat for this life history stage. Two estuaries (Weskeag River and Penobscot Bay) along Mid‐coast Maine were sampled monthly with daytime 1.0 m2 fixed‐frame throw traps around neap low tide, May–December over two consecutive years (2003–2004). Both eelgrass and adjacent sand/mud (20–60 cm deep) were randomly sampled with equal effort (4–12 samples per month) at two sites in both the Weskeag River and Penobscot Bay. Significantly higher densities of YOY winter flounder (2–9 cm TL) occurred in eelgrass relative to sand/mud. Density increased significantly in both habitats in 2004, and was higher in Penobscot Bay relative to the Weskeag River. YOY densities compared by eelgrass coverage within throw traps were found to be significantly higher in eelgrass that exceeded 30% coverage when compared with adjacent sand/mud areas and eelgrass coverage of 10–20%. YOY occurred in all months sampled (May–December); no density differences existed by month. These results indicate that very shallow (
  • Length‐weight and length‐length relationships of two tropical
           fish Secutor megalolepis (Mochizuki & Hayashi, 1989) and Rhabdamia
           gracilis (Bleeker, 1856) from Sabah, Malaysia
    • Abstract: Length‐weight relationships (LWRs) and length‐length relationships (LLRs) for two tropical fish species from Marudu Bay, Sabah were studied. Specimens were caught with the traditional ‘Bagan net’ fishing gear from October 2012 to September 2013, using the light trap method. The maximum total length for Rhabdamia gracilis (7.4 cm) reported in this study is a new record for this species. No information regarding length‐weight relationships was reported previously in FishBase for either Secutor megalolepis or Rhabdamia gracilis.
  • Relationships between fish size and otolith measurements for 33 fish
           species caught by bottom trawl in Haizhou Bay, China
  • Length–weight relationships of four Cyprinid species in India
    • Abstract: Length–weight relationships are reported for four Indian carps. The length–weight relationship was W = 0.01123L3.355 for Cirrhinus mrigala, W = 0.07354L3.299 for Catla catla, W = 0.04066L3.313 for Labeo rohita and W = 0.11489L2.732 for Labeo fimbriatus. LWR estimates for C. mrigala and L. fimbriatus had not been previously reported in FishBase.
  • Early development and allometric growth patterns in ide Leuciscus idus
           (Linnaeus 1758)
    • Abstract: Allometric growth and ontogeny were studied in ide Leuciscus idus (L.) reared in laboratory conditions from 0 to 30 days post hatching (DPH), to define important steps in the species’ early life history. Based on the external morphology, eleven different stages during the early development of ide were identified (ES9a – JS1a; ES – embryonic stage, JS – juvenile stage). After a short period of rest, hatched individuals were visual feeders with a pelagic life. Organogenesis and allometric changes indicated that development priorities concerned feeding efficiency, respiration efficiency and locomotion performances. Also concluded was that the gradual changes observed in body proportions (which occurred across a wide range of body lengths) reflect the absence of abrupt changes in the behaviour and habitat and may also be considered as a gradual adaptation to life in flowing water.
  • Evaluation of an improved RNA/DNA quantification method in a common carp
           (Cyprinus carpio Linnaeus 1758) larval feeding trial with Artemia, two
           nematodes (Panagrellus redivivus Linnaeus 1758, Panagrolaimus sp. Fuchs
           1930) and dry feed
    • Abstract: The RNA/DNA ratio commonly used as proxy for the nutritional condition of fish larvae is affected by RNA degradation during analysis. For evaluation of two strategies to improve RNA integrity, a three‐week feeding trial was carried out to assess the suitability of two nematode species (fam. Panagrolaimidae) as feed for newly hatched carp larvae (Cyprinus carpio) in comparison to Artemia nauplii (Artemia sp.) and a commercial dry feed. Aiming for an increased reproducibility of RNA/DNA determination, a high‐salt inactivation (RNA later) as well as a targeted approach with a recombinant RNase inhibitor were compared to the classical protocol using lab chip technology. Improved RNA integrity was observed with high‐salt inactivation when compared with a strategy applying a specific RNase inhibitor or the classic protocol. Carp larvae fed Artemia for 2 weeks and then dry feed for 1 week revealed the best overall growth performance as well as survival [83.0 ± 35.2 mg fresh weight (FW), 20.0 ± 2.4 mm total length (TL), 86.6 ± 11.7% survival]. Larvae fed the nematode species Panagrellus redivivus for 1 week and subsequently dry feed for 2 weeks (37.4 ± 29.1 mg FW, 14.7 ± 2.8 mm TL, 76.0 ± 6.0% survival) performed better than larvae fed with dry feed alone (28.2 ± 29.6 mg FW, 14.3 ± 2.9 mm TL, 54.3 ± 14.2% survival) or those receiving Panagrellus for 2 weeks. Between both nematode species, Panagrellus was a better feed with regard to growth performance and survival. RNA/DNA ratios ranged between 0.65 ± 0.27 (8 days post‐hatch) and 1.96 ± 0.63 (22 days post‐hatch) and were in the same treatment order as the other growth parameters. RNA/DNA ratios were significantly correlated with the growth rate, and decreasing RNA/DNA ratios in larger larvae may reflect decreasing growth rates with size rather than decreased nutritional status. Here, an improved RNA/DNA ratio protocol is presented in a feeding trial that reveals the suitability of nematodes as a first feed for common carp larvae.
  • Length‐weight relationship of Cobitis elongatoides Heckel &
           Kner, 1858 from a pure diploid population in the Nová
           Říše Reservoir, Czech Republic
    • Abstract: This study describes the length‐weight relationship of pure diploid individuals of Cobitis elongatoides from the Nová Říše Reservoir, Czech Republic. The resultant length‐weight relationship was highly dependent on the individuals included, thus the length‐weight relationship of males, small females and large females differed significantly. Furthermore, these relationships varied between sampling seasons. Further studies are planned to test for differences between different ploidy levels.
  • Length‐weight relationships in some populations and species of
           Iranian loaches
    • Abstract: Length‐weight relationships were estimated for eight species of Iranian loaches. The L‐W parameters for three of the species are given for the first time.
  • Issue Information
  • Length–weight relationships of 33 fish species from New Zealand
    • Abstract: Length–weight relationships are presented for 33 fish species from New Zealand. The parameters a and b of the equation W = aLb were estimated. Parameter b ranged from 2.51 (Pseudocaranx dentex) to 3.51 (Alepocephalus antipodianus) with a mean of 3.12 ± 0.24. Most of these estimates (90.9%) were between 2.8 and 3.4. Maximum lengths and depths of catch are updated for nine species.
  • Effect of salt content on the denaturation of pike eel (Muraenesox
           cinereus Forsskål, 1775) actomyosin
    • Abstract: Investigated were the effects of the salt content on the denaturation of actomyosin (AM) extracted from the dorsal muscle of pike eel, Muraenesox cinereus. The results indicated a notable amount of secondary structure change, particularly the α‐helix. Increasing the salt concentration reduced the Ca‐ATPase activity. Surface hydrophobicity of AM increased concomitantly with an increase in the salt concentration. Total and reactive sulfhydryls also changed with an increase in the salt concentration. Results of differential scanning calorimetry (DSC) indicated that the salt‐curing led to some shifts from high to lower transitional temperatures. Disulfide linkages and hydrophobic interactions appear to be critical for the changes in actomyosin.
  • Annual reproductive cycle, spawning periodicity and sexual maturity of
           false scad Caranx rhonchus (Geoffroy Saint‐Hilaire, 1817) (Pisces,
           Carangidae) from the South‐Eastern Mediterranean (Gulf of
           Gabès, Tunisia)
    • Abstract: The reproductive biology of Caranx rhonchus (Geoffroy Saint‐Hilaire, 1817) (Pisces, Carangidae) was studied in the Gulf of Gabès (Mediterranean Sea) from June 2004 to May 2006. Of 1313 individuals examined, 668 were females (50.9%) and 645 were males (49.1%). The overall sex ratio did not deviate significantly in favour of females (♀ : ♂ = 1.04 : 1). Monthly changes in the Gonado–Somatic Index (GSI) showed a rapid increase from May to June and an extended very high level from June to September (4.43–3.47% for females and 3.35–2.61% for males), before declining sharply in October (down to 2.02% for females and 0.57% for males). The gametogenesis activity began with a pre‐maturation phase from March to May, followed by a ripe‐spawning phase from June to September. From the last days of July to the end of October, the gonads were in the spent and post‐spawning stages. From November to early May, gonads were in the resting stages. The size at which 50% of the population reached sexual maturity was not significantly different between males and females :  males attained sexual maturity at fork length FL50 = 161.20 ± 0.37 mm (n = 262), whereas females attained maturity at FL50 = 160.70 ± 0.23 mm (n = 296). The age of maturity for both sexes occurred at 2.1 years.
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