Studies were carried out on composite fish culture in two earthern ponds of 100 m each in size using Catla, Rohu, Migral and Common Carp at 15% 40% 25% and 20% ratio, respectively. Fish population density was maintained at 5,000/HE in one pond and 7,000/ha in the other. The annual net production in these ponds was 2.005 kg/ha and 2.160 kg/ha respectively. The growth rate of the individual species was found to be inversely proportionate to the species ratios. Catlo with the minimum species ratio (25%) gained the minimum weight High population density exerted stress in reducing the size of fishes in 7.000/ha density pond compared to those in 5,000/ha density pond. The cost of production and cost benefit were computed from the studies and presented.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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