Abstract
Fish is a rich source of protein, vitamins and minerals. New knowledge on the role of omega-3 fatty acids in human physiology and their high contents in fish has added a new dimension to their importance in health and nutrition . Oreochromis niloticus (Nile tilapia) is one of the fish species of great economic importance in the globe. Reproductive biology of O. niloticus in the Yamuna was studied. Samples of O. niloticus were collected monthly during August 2011 to July 2012. The fishes breed in months of March to June and September to November. Sex ratio of male and female fishes was equal in 43.1-46.0 cm size group. Male proportion was higher in all size groups except 43.1-46.0 cm size group. In 10.1-13.0 cm, 25.1-28.0 cm and 28.1-31.0 cm size groups’ female proportion was half as compared to male fishes. Observed difference was not significant in all size groups, except 19.1-22.0 cm size group. Chi-square values were recorded maximum in 19.1-22.0 cm size group with 4.56 and minimum in 31.1-34.0 cm size group with 0.02. Higher proportion of male was observed in the stock, sex ratio of male and female was 1:0.78 and Chi-square value was 7.94 and the difference was significant. The fecundity and breeding frequency of O. niloticus indicated that the climate condition of the Yamuna river most suitable for O. niloticus.
Highlights
The large network of inland water masses will continue to provide great potential for economic capture fishery which will compete well with fast growing fish culture practices
Sex structure of male was observed maximum in 10.1-13.0 cm size group (66.67%) while female was observed in 43.1-46.0 cm size group with 50% (Figure 3)
The high fecundity of O. niloticus in the Yamuna River at Allahabad could probably be a result of combination of different causes such as climatic condition, habitat structure, food abundance, water quality and quality of food
Summary
The large network of inland water masses will continue to provide great potential for economic capture fishery which will compete well with fast growing fish culture practices. Culture of O. niloticus is increasing significantly in African and several Southeast Asian countries due to its fast growth rate under high stocking rates and seed availability in culture ponds [12,13]. Information on the breeding and fecundity of O. niloticus can provide basic knowledge for the proper management of the resource Such knowledge is not recently available for this species in the Yamuna and this has hindered proper management of the fishery. The present study was carried out to investigate sex ratio, sex structure, breeding season and fecundity of O. niloticus from the Yamuna River at Allahabad, India. J Climatol Weather Forecasting 4: 164. doi:10.4172/2332-2594.1000164
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