This study assesses the effects of 1,1-bis (4-chlorophenyl)-2,2,2-trichloroethane (DDT) on the reproduction and gonadal histology of adult Mozambique tipalia (Oreochromis mossambicus). The fish were allowed to breed, following exposure to 2 and 5μg/l of waterborne technical-grade DDT for 40 days. Fertilized eggs were artificially incubated. In the 5μg/l exposure, posthatch survival was signific...

The carotenoid trade-off hypothesis states that diet-derived carotenoids are traded off among competing physiological demands, but this statement is rarely tested in ornamented females. In this study, reverse sexually dimorphic convict cichlids (Amantitlania nigrofasciata) were fed diets containing carotenoid supplementation at three biologically relevant levels for 12 wk. This treatment was fo...

The ecology of Notropis atrocaudalis (Blackspot Shiner) including habitat associations, population age structure, reproduction, and food habits were examined in two east Texas streams from November 2001 through October 2002. Blackspot Shiner were generally found in relatively shallow, slowowing runs, but exhibited no strong seasonal habitat associations. The population consisted of four age gro...

The commercially important migratory fish Prochilodus brevis is from the Neotropical region, and understanding the reproductive ecology of this potamodromous fish is essential for its conservation and management. This study investigated the length-mass relationship, sex ratio, length at first gonadal maturity, gonadal development stages, gonadosomatic index, condition factor, and reproductive p...

We observed the behavior and ecology of Chaetodon capistratus infected and uninfected with the ectoparasitic isopod Anilocra chaetodontis to assess whether there may be parasite induced alterations in host biology, host defenses against infection, and/or pathology related to infection. We also examined habitat related differences in infection rates. Infected fish had higher rates of interaction...

865 specimens of Galeoides decadactylus were analysed for spawning, length-growth, mortality and exploitation rates in May-October 2020, to support with management information. Gonads macroscopically assessed total length-frequencies from growth models FiSAT II software. Gonadosomatic Index the stock peaked October alongside Hepatosomatic Index, attained first sexual maturity at lengths 19.8 cm...

............................................................................................................................... i Acknowledgments.............................................................................................................. iv List of Tables ..................................................................................................................... ix Li...

Breeding performance of stunted rohu Labeo rohita (Hamilton, 1822) was compared with normally reared rohu. Randomly selected and normal fishes were tagged together in a single earthen pond for broodstock development. Both groups exhibited growth enhancement during the development period, though found larger size than fishes, after rearing period. Gonadosomatic Index (GSI) female indicated simil...

The study demonstrates whether the Guanchiche of Vinces rivers presents pathogenic bacteria Vibrio type, which can cause many gastrointestinal diseases. fish were obtained directly from sampling sites, and physiological nutritional status was determined through indicators Hepatosomatic Index (IHS), Gonadosomatic (IGS), Condition Factor (CF), microbiological isolation characterization. Values re...

Effective fisheries management depend on having an exact assessment of biological parameters, including growth reproduction, size at sexual maturity ( L m ), and stock assessment. The purpose this research was to estimate the ) for 20 fish species belongs 14 families from a wetland (Gajner Beel ecosystem in north-western (NW) Bangladesh through multi-models such as length max based empirical mo...