Níveis de proteína bruta para juvenis de pirarucu

Abstract

Resumo -O objetivo deste trabalho foi avaliar o efeito de quatro níveis de proteína sobre o crescimento de juvenis de pirarucu, Arapaima gigas. O experimento foi conduzido em delineamento inteiramente casualizado, com de quatro tratamentos (32,7%, 39,3%, 43,4% e 48,6% de proteína bruta), três repetições cada. Foram utilizados 120 peixes, com peso médio inicial de 120,6±3,5 g, distribuídos homogeneamente em 12 tanques-rede de 1 m 3 cada, contendo dez peixes por tanque. Após 45 dias, os resultados indicaram que as dietas com 48,6% de proteína resultaram em melhor ganho de peso, crescimento específico e composição corporal diferenciada. A conversão alimentar e a eficiência da ração não produziram diferenças entre os tratamentos. O nível de proteína na ração que produz máximo crescimento é de 48,6%.Termos para indexação: Arapaima gigas, aqüicultura, nutrição de peixes, dietas práticas, peixes carnívoros. Crude protein levels for juvenile pirarucuAbstract -The objective of this work was to verify the effect of four protein levels on pirarucu, Arapaima gigas, growth performance. One hundred and twenty pirarucu juveniles, with an average weight of 120.6±3.5 g, were stocked into 12 floating cages with 1 m 3 (ten fish per cage), in a complete randomized design with four treatments (32.7%, 39.3%, 43.4% and 48.6% crude protein), in three replicates each. After 45 days, results showed that diet with highest protein level (48.6%) produced a better weight gain, specific growth rate, and differentiated body composition. Feed conversion and protein efficiency ratios did not show any differences among treatments. The dietary protein level required to produce maximum growth is 48.6%.

Morphometrical development of tambaqui (Colossoma macropomum, Cuvier, 1818) under different photoperiods

“…These values are lower than the ones found by Ituassú et al (2004), who worked with juvenile tambaqui weighting initially 75.68g, on average, and found specific growth rate means that ranged from 0.97 to 0.83%/day. Fernandes et al (2004), also estimated specific growth rate values higher than the ones obtained in this study, between 1.64 and 1.80%/day for pacu fingerlings, just like Ituassú et al (2005), who observed values of specific growth rate between 1.4 and 2.4%/day for juvenile pirarucu fed diets with variation of crude protein levels. Muñoz-Ramirez & Carneiro (2002) observed even higher values of specific growth rate, between 2.27 and 1.76%/day, for the initial stage of growth of pacu fed diets with different supplementations of lysine and methionine and low protein value.…”

Digestible Protein Requirement of Pirarucu Juveniles (Arapaima gigas) Reared in Outdoor Aquaculture

“…Fish fed a diet with ~36% DP by polynomial regression analysis showed optimum FCR (2.03), suggesting that this protein level is suitable for maximal protein synthesis. The FCR found in the present study was similar to Ituassú et al (2005), who found an FCR of 2.3 in 120 g fish. However, those results differed from Del Risco et al (2008), who found an FCR of 1.07 in fish of 86-470 g fed CP at 40%.…”

A new approach to feed frequency studies and protein intake regulation in juvenile pirarucu

“…The value obtained for protein intake remained constant throughout the experiment period, and was similar to that reported by Ituassú et al (2005) and Del Risco et al (2008) for the species.…”