SEASONAL VARIATIONS IN FISH ABUNDANCE AND BIOMASS OF IDUKKI RESERVOIR, KERALA, INDIASimimole Sebastian, Joice V. Thomas and Jose D. KaippallilAbstract Idukki reservoir, the largest reservoir in Kerala was investigated for a period of three years (2007-2010) to study the ichthyofauna of the reservoir. Fishes were sampled bimonthly from 16 stations with the help of fishermen using gillnets. In the present study, a total of 19 species of fish belonging to 18 genera, 11 families and 6 orders were recorded in the reservoir. Significant seasonal variations were obtained in the abundance and biomass obtained during three seasons (premonsoon, monsoon and postmonsoon). Premonsoon season recorded highest abundance of fish with an average of 863 numbers whereas monsoon season recorded highest biomass (204.51kg). Species Ompok bimaculatusrecorded the highest catch in terms of abundance and Channa gachuarecorded the highest biomass. The study also reveals that Idukki reservoir is having a moderate fish composition and diversity when compared to other large reservoirs in the country.
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