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Valine in diets for Nile tilapia1 1 Parte da Dissertação em Recursos Pesqueiros e Engenharia de Pesca do primeiro autor, apresentada na Universidade Estadual do Oeste do Paraná/UNIOESTE. Pesquisa apoiada pelo Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) e pela Comissão de Aperfeiçoamento de Pessoal do Nível Superior (CAPES).

Valina em dietas para tilápia do Nilo

ABSTRACT

This study verified the effect of valine on the zootechnical performance, percentage composition and growth of skeletal muscle fibre in fingerlings of Nile tilapia. A total of 270 fish (average initial weight 1.57 ± 0.05 g and total initial length 4.16 ± 0.46 cm) were used, distributed in 18 tanks (250 litres), in a completely randomised design with six treatments and three replications. Six diets (26.81% DP and 3200.00 kcal DE) were formulated with increasing levels of valine (0.82, 0.86, 0.98, 1.04, 1.10 and 1.26% of the diet). The zootechnical performance, percentage composition of the fish, and muscle-fibre distribution were evaluated. There was no effect from the different levels of valine (P>0.05) on zootechnical performance, percentage composition or the frequency distribution of muscle fibre. The addition of 0.82% valine (2.65% crude protein valine) is recommended in the diet of Nile tilapia fingerlings.

Key words:
Essential amino acid; Aquaculture; Zootechnical performance; Oreochromis niloticus

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