This paper presents the heritability estimates for body weight and survival in O. niloticus based on data from a selection experiment carried out in ponds receiving chicken manure as the only pond inputs. Fish used for this study were selected for body weight for two generations. Heritability estimates for body weight at harvest ranged from 0.38 to 0.60. These results indicate the feasibility of selection for growth of Nile tilapia in fertilized ponds without supplementary feeding. Common environmental effects for body weight were around 0.10. Survival varied substantially between ponds and our results indicate that survival of Nile tilapia can be improved by stocking larger fry. Further, we found evidence that survival is affected by genetic factors: the heritability estimates for survival from 0.03 to 0.14.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 09.03, 2006
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