Rai, Sunila creator Lin, C. K. Chairperson Edwards, Peter Examination Committee Little, David C. Examination Committee NORAD Scholarship donor text th Bangkok Asian Institute of Technology 1997 monographic eng

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85 leaves An experiment was conducted for 112 days to evaluate the growth performance of hybrid catfish and carps (silver carp, rohu and mrigal) in three different stocking ratios of 3.2:1, 4.8:1 and 6.4:1, and their impact on water quality and nutrient budget. Hybrid catfish were stocked in 1.2 m3 cage, at a density of 100, 150 and 200 fish/cage. Fish were fed on pellet feed, at a rate of 2% body weight. Carps were stocked at a rate of 5,000 fish/ha in 250 m2 ponds. The ratio of carps was 1: 1 : 1. The carps were grown solely on natural food produced by nutrients wastes from caged catfish. Ponds were fertilized prior to stocking at a rate of 4 kg N/ha/day and 1 kg P/ha/day. Net fish yield of hybrid catfish (28.7 kg/cage), net yield of carps (13.3 kg/pond) and combined net yield of caged catfish and pond carps (127.9 kg/pond) were significantly higher (P<0.05) in higher stocking density of catfish. Stocking ratio of 6.4: 1 appeared to be the best stocking ratio. Stocking ratio did not affect water quality. Hybrid catfish culture released 61-64% N and 76-79% P, out of which carps recovered 3.1-3.8% N and 2.4-2.9% P, and 1.5-2.3% N and 1.3- 14.0% P were lost to the water column. Rest nutrients were unaccounted for. Nutrients derived from the wastes equal to fertilization rate of 0.9-1.6 kg N/ha/day and 0.3-0.5 kg P/ha/day, which were grossly inadequate for phytoplankton production to support the growth of herbivorous carps. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 1997 Fish-culture Catfishes Carp Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B13776 http://203.159.5.9/ait-thesis/detail.php?q=B13776 20260817172953.0