Effects of Greenhouse and Stocking Density on Growth and Survival of African Catfish ( Clarias gariepinus Burchell 1822) Fry Reared in High Altitude Kenya Regions
Mwatete, Mlewa Chrisestom
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Production of African catfish (Clarias gar iepinus) under culture in high altitude ar eas has faced challenges due to slow growth related to low temperatur es. This study was therefore designed to test the hypothesis of better growth of African catfis h raised in greenhouses for improved production in high altitude areas. A 2 x 3 factorial design with 2 greenhouse treatments and three sto cking densities of 5 fry/L, 10 fry/L, 20 fry /L as factors was used. The interaction between stocking density and greenhouse treatmen ts significantly (p < 0.05) influenced growth performance and the percentage survival. At harvest, the average weight and % surviv al inside the greenhouse were signific antly greater (p<0.05) for those fr y stocked at lower densities (148.61 3.59 mg and 97.3 %) as compared to outside the greenhouse (96.6 2.4 mg and 54.67%). Those stocked at the hi ghest density showed lower mean weight and percentage survival (85.93 2.08mg and 75.5%) but were signific antly greater (p<0.05) than those reared outside the greenhouse (70.07 2.51 mg and 30.6%).These results indicated that growth and surviv al of catfish fry were signific antly affected by the greenhou se effect and stocking densities range of 5-10 fry/L and hen ce recommended for adoption in high altitude areas.