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The body proportions of 0-group Pacific herring, Clupea pallasii, were compared between hatchery-reared- and wild fish and significant differences were observed. There were fewer vertebrae (Mean ± SD) in hatchery-reared- (52.5 ± 2.15) than in wild fish (53.7 ± 0.92). For both the hatchery-reared- and the wild individuals, the correlations between number of vertebrae and vertebral column length (VCL)...
The length–weight relations (LWR) were estimated for 20 fish species from the Pearl River, South China. A total of 3610 specimens representing 10 families were used to estimate the relation parameters. The b values in the LWR (W = aLb) ranged from 2.068 for Odontamblyopus lacepedii (Temminck et Schlegel, 1845) to 3.423 for Pseudogobius javanicus (Bleeker, 1856). The LWR with high coefficient of determination...
Background. on a short standardized segment of the genome. The main objective of the barcode of life project is to provide a database of genetic sequences which can be used as a tool for universal species identification. Indonesia has at least 1300 freshwater fish species, however unfortunately no species has been barcoded as yet. In the presently reported study, we subjected to barcoding a total...
We present a length–weight relation and use rapid, low-cost histological methods to describe the reproductive biology of the blacktail snapper, Lutjanus fulvus (Forster, 1801), based on 124 specimens collected from a remote area in Papua New Guinea [W = 0.0134(FL)3.100]. We estimate male L50 at 13.5 cm FL and female L50 at 18.8 cm FL. Sex ratio is not significantly different from 1 : 1. The species...
Fish reproductive biology (onset and duration of spawning, sex ratio, maturity stages, length and age at maturity, and fecundity) is important in fisheries research, stock assessment, and management. In this editorial note, we provide some criteria and recommendations on issues of fish reproductive biology, which may be useful in research planning, data analysis and presentation, as well as in manuscript...
Background. Traditional Chinese herbs (TCHs) are widely used for improving non-specific immunity of fish in aquaculture. Possible effects of many important TCH on red drum, Sciaenops ocellatus (Linnaeus, 1766), have not been adequately studied. The aim of the presently reported study was to investigate the effects of ten TCH on selected immunological- and haematological responses of red drum. Materials...
Background. Prussian carp, Carassius gibelio (Bloch, 1782), is one of the successful invaders of freshwater systems of Turkey. Although, Prussian carp has rapidly expanded its area of distribution in Anatolia during the last two decades, there is limited information about its biological features in new environments. In order to determine the impact of invasive species on ecosystem, the life history...
Background. Long whiskered catfish, Mystus gulio (Hamilton, 1822), enjoys a high consumer preference and market demand in many Asian countries including India. However, the growth of this fish is very slow under normal aquaculture conditions. The non-hormonal growth promoter—cholymbi—which contains minerals and the essential amino acids lysine and methionine, is widely used in livestock and poultry...
Background. The doublespotted queenfish, Scomberoides lysan (Forsskål, 1775), is one of the most important and highly priced food fishes popular for dry fish production in Sri Lanka. Knowledge of spawning pattern and season are important for the management of S. lysan. The biology of S. lysan is poorly known, however, and no specific management regime is available for this species in Sri Lanka. The...
Length–weight (L–W) relations are presented for 34 fish species covering a full annual fishing period (231 fishing days) of professional small-scale fishery in Korinthiakos Gulf during 2008–2009. These were the typical fish species caught by Greek small-scale fishery. Mean annual values of b ranged from 2.751 to 3.704. The L–W relations were positively allometric for 12 species, negatively allometric...
Due to the importance of the estuarine fish fauna in Mexico and the implications of length–weight relation (LWR) for management and conservation, we present the estimates of the LWR for eight fish species from Rio Huach, a small estuarine system of the Mexican Caribbean. Fishes were caught in five sampling points during an annual cycle (1998) and in November of 2000, were measured with a digital calliper...
On 25 September 2012, seven individuals of Champsodon vorax Günther, 1867 and five individuals of Champsodon capensis Regan, 1908 were caught during a bottom trawl activity, from a depth of 30–100 m in the Gulf of Antalya, Turkey. Both species are Lessepsian migrants, previously reported in the eastern Mediterranean Sea. C. vorax is being reported for the first time from Turkey, whereas C. capensis...
Background. Farmed fish reared in aquaculture systems are exposed to physiological stressors from biological, chemical, and physical sources. The consequences of these stressors affect the productivity of farming outcomes by reducing immune response, growth, and development within fish. A 24-h study was performed to determine the effects of supplementing puerarin—the most biologically active ingredient...
Background. Ichthyobodosis (“costiosis”) is induced by the flagellate Ichthyobodo necator in both wild and cultured host populations. Fish farmers for decades have been using formaldehyde (FA) for control but this compound is problematic due to its carcinogenic and allergenic nature. Alternative auxiliary substances for bath treatment are needed and therefore we decided to compare efficacies of sodium...
Background. At the end of 1980s, ecological regime shifts occurred in the Baltic. Since, the Baltic fish assemblage has been dominated by sprats, whereas before cod was the dominant fish species. The majority of previous food studies refer to the period before the shift. This raises the question, how changes in the Baltic ecosystem have affected the diet of cod. The aim of the presently reported study...
Length–weight relations were estimated for 14 endemic fish species of the upper Yangze River, namely Sinogastromyzon szechuanensis Fang, 1930; Jinshaia sinensis (Sauvage et Dabry de Thiersant, 1874); Megalobrama pellegrini (Tchang, 1930); Coreius guichenoti (Sauvage et Dabry de Thiersant, 1874); Rhinogobio cylindricus Günther, 1888; Rhinogobio ventralis (Sauvage et Dabry de Thiersant, 1874); Procypris...
Background. Endocrine disrupting chemicals (EDCs) are natural and anthropogenic compounds discharged into the environment known to disrupt the endocrine system of humans and animals by mimicking functions of steroids in vivo. Many important events occurring during early postembryonic development, in relation to the gene expression attracted our attention. Quantitative real-time PCR (qRT-PCR) is a...
Background. Fish may experience periods of food deprivation or starvation in nature and under culture conditions. Because of the wild stock reduction of some sturgeon species, Siberian sturgeon, Acipenser baerii Brandt, 1869, has been used as a biological model of physiological and nutritional studies since the 1980s. There are no published records on the physiological responses of Siberian sturgeon...
Background. Ultraviolet (UV-B) radiation affects the immune system of fish. Dietary supplementation of natural immunostimulants may enhance the immunity of fish. The presently reported investigation evaluates the UV-B protective property of Achyranthes aspera seed in larvae of rohu, Labeo rohita (Hamilton, 1822). Materials and Methods. Larvae (1.19 ± 0.03 g) were fed four formulas of diet containing...
Background. The round goby, Neogobius melanostomus (Pallas, 1814), is a recent invader in the Curonian Lagoon, SE Baltic Sea. As invasive species are among the most severe threats for biodiversity loss and can induce food web alterations, the development of round goby population in the Curonian Lagoon and its possible impacts on fish community and the entire ecosystem are of great scientific interest...
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