Growth performance of fry and fingerlings of oreochromis niloticus fed on different agro-industrial by-products
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University of Cape Coast
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xiv, 134p.: ill
The study was conducted at the Aquaculture Research and Development Centre at Akosombo to observe the growth performance of fry and fingerlings of O. niloticus; and also assess the cost-effectiveness of the different dietary treatments. In experiment 1, four isonitrogenous (36% crude protein) and isoenergetic (gross energy 18 MJ/kg) diets were formulated to contain agro-industrial by-products including: wheat bran (diet 1), pito mash (diet 2), rice bran (diet 3) and groundnut bran (diet 4) and fed to fry of O. niloticus (average initial weight 0.11 ± 0.01 g) stocked at 50 m-3 in out-door hapas for 8 weeks. In experiment 2, four isonitrogenous (30% crude protein) and isoenergetic (gross energy 18 MJ/kg) diets were formulated from the same by-products as in experiment 1 and fed to O. niloticus fingerlings (average initial weight 7 ± 0.23 g) stocked at 20 m-3 for 24 weeks. Growth performance was similar (P > 0.05) for fry O. niloticus among all treatments. However, incidence cost was highest for diet 4 and lowest for diet 2. Fish fed on diet 2 had the highest (P < 0.05) profit index and those fed on diet 4 had the lowest. Growth performance in fingerlings was highest (P < 0.05) in diet 1 and least in the control. Whiles incidence cost was highest (P < 0.05) for fish fed diet 4 and lowest (P < 0.05) for fish fed diet 2. In conclusion, the growth performances were similar (P > 0.05) for fry of O. niloticus among all treatments. For O. niloticus fingerlings, diet 1 produced the fastest growth. Diet 2 was the most cost-effective diet. From this study, diets 1 and 2 for rearing of O. niloticus are recommended for feeding.
The study was conducted at the Aquaculture Research and Development Centre at Akosombo to observe the growth performance of fry and fingerlings of O. niloticus; and also assess the cost-effectiveness of the different dietary treatments. In experiment 1, four isonitrogenous (36% crude protein) and isoenergetic (gross energy 18 MJ/kg) diets were formulated to contain agro-industrial by-products including: wheat bran (diet 1), pito mash (diet 2), rice bran (diet 3) and groundnut bran (diet 4) and fed to fry of O. niloticus (average initial weight 0.11 ± 0.01 g) stocked at 50 m-3 in out-door hapas for 8 weeks. In experiment 2, four isonitrogenous (30% crude protein) and isoenergetic (gross energy 18 MJ/kg) diets were formulated from the same by-products as in experiment 1 and fed to O. niloticus fingerlings (average initial weight 7 ± 0.23 g) stocked at 20 m-3 for 24 weeks. Growth performance was similar (P > 0.05) for fry O. niloticus among all treatments. However, incidence cost was highest for diet 4 and lowest for diet 2. Fish fed on diet 2 had the highest (P < 0.05) profit index and those fed on diet 4 had the lowest. Growth performance in fingerlings was highest (P < 0.05) in diet 1 and least in the control. Whiles incidence cost was highest (P < 0.05) for fish fed diet 4 and lowest (P < 0.05) for fish fed diet 2. In conclusion, the growth performances were similar (P > 0.05) for fry of O. niloticus among all treatments. For O. niloticus fingerlings, diet 1 produced the fastest growth. Diet 2 was the most cost-effective diet. From this study, diets 1 and 2 for rearing of O. niloticus are recommended for feeding.
Keywords
Fry and fingerlings of O. niloticus, Fingerlings - growth, Cost-effectiveness of the different dietary treatments