Resumo

RUIZ PENA, María Alejandra et al. Mass selection by weight and coloration in red tilapia. Acta Agron. [online]. 2009, vol.58, n.2, pp.109-114. ISSN 0120-2812.

In order to evaluate the effectiveness of mass selection by color and weight, two generations (G₁ y G₂) of red tilapia Oreochromis sp. were analyzed. 40000 larvae were used, at the sixth week fries with black spots and white were eliminated, and at week 14, the fishes were separated by sex. The weight (g), length, height and width (cm) were measured in a sample of 150 individuals at 6, 14 and 24 weeks. At week 24, the best 150 males and 450 females with desirable colorations and higher weight were chosen. The selection was effective for coloration in G₂, because proportion of red individuals increased in 15% compared to the control. The effect of the selection between generations (G₁ y G₂) was positive because proportion of red fries increased from 64% to 84%, and the spotted ones were reduced from 31% to 13%. In both generations males were significantly weighted than the females. For weight and size, significant differences between generations were found due to the fact that the selected ones were over the control on 27% and 8% (G₁) and 22% and 11% (G₂) for weight and size respectively.

Palavras-chave : Fish breeding; aquaculture; Oreochromis sp.

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