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Growth and survival at tagging of gift nile tilapia (Oreochromis niloticus) generation 15

FRIday - 21/11/2014 02:26
This study assessed the differences between families of Nile tilapia (Oreochromis niloticus) of the GIFT generation 15 in the Mekong Delta of Viet Nam for growth traits (body weight, length, and height) and survival (individual and family-based).

The effects of ‘nursing time’ and ‘family’ were analysed using linear or logistic regression models with the R software. Genetic parameters (heritability h2, environmental effects common to full-sibs c2, and genetic correlations rg) for traits were analysed using linear mixed animal model with ASReml software. The effects of ‘nursing time’ and ‘family’ were highly significant (P<0.001). For models that include c2, heritability was 0.23 ± 0.03 (estimate ± standard error) for body weight; 0.42 ± 0.06 for length; and 0.37 ± 0.08 for height; environmental effects common to full-sibs was 0.77 ± 0.03; 0.52 ± 0.05 and 0.47 ± 0.06, respectively. For model without c2, heritability was 0.99 ± 0.00 for body weight, length, and height. For individual survival (alive = 1, dead = 0), heritability was 0.29 ± 0.02. Genetic correlation (rg) between body weight and individual survival at tagging was 0.22 ± 0.01, indicated that fast growth at fingerling stage tends to improve survival.

Trinh Quoc Trong
National Breeding Center for Southern Freshwater Aquaculture

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