Protein requirement of tambaqui juveniles (Colossoma macropomum) after feed deprivation

• Published in: Acta amazonica Vol. 40; no. 3; pp. 597 - 604
• Main Authors: Santos, L, Filho, M P, Sobreira, C, Ituassu, D, da Fonseca, FAL
• Format: Journal Article
• Language: Portuguese
• Published: 01-09-2010
• Subjects: Colossoma macropomum
• ISSN: 0044-5967

The aim of this work was evaluate protein requirement of tambaqui (Colossoma macropomum) juveniles after feed deprivation. During 60 days, fish (50,3 plus or minus 0,26 g) were fed on four isoenergetics diets with different protein content (28, 32, 36 and 40% crude protein) at two feeding regimes (with and without feed deprivation) under completely random factorial design (4x2) in triplicate. Water quality parameters and performance index were evaluated at 1st, 15th and 60th days. Water quality parameters were kept at normal fish cultivation patterns. No mortality in the tested treatments. There were observed differences among treatments for performance indexes analyzed: growth rate, feed efficiency, daily feed consumption, crude protein consumption, efficiency protein rate and relative weight gain, except for hepatosomatic index. Hyperfagia was detected indicating the occurrence of compensatory growth. Fat content and body protein deposition increased in fishes refed on 36% of crude protein. These results explain some data observed belong the experiment like the increase of weight gain, of the hyperfagia time extension, of the growth rate and of the feed efficiency. Therefore those fish shows increase on weight gain, hyperfagia time, growth rate and feed efficiency. There is no influence of feed deprivation on protein requirement tambaqui juveniles.Original Abstract: O objetivo deste trabalho foi avaliar a exigencia proteica de juvenis de tambaqui (Colossoma macropomum) apos a privacao alimentar. Os peixes (50,3 plus or minus 0,26g) foram submetidos a quatro racoes isoenergeticas com diferentes concentracoes proteicas (28, 32, 36 e 40% proteina bruta) e dois regimes alimentares (com privacao e sem privacao) durante 60 dias. O delineamento experimental foi inteiramente casualizado, em esquema fatorial 4x2, em triplicata. Avaliaram-se os parametros de qualidade de agua e de desempenho no 1 degree , 15 degree e 60 degree dia de experimento. Os parametros da qualidade da agua permaneceram dentro dos padroes de cultivo. Nao houve mortalidade nos tratamentos testados. Foram observados diferencas entre os tratamentos para os indices de desempenho analisados: taxa de crescimento especifico, eficiencia alimentar, consumo diario de racao, consumo de proteina bruta, taxa de eficiencia proteica e ganho de peso relativo, com excecao do indice hepatossomatico. Houve hiperfagia, indicando a existencia de crescimento compensatorio. Os peixes realimentados com 36% proteina bruta tiveram incremento no teor de gordura visceral e maior deposicao de proteina corporal. Estes resultados explicam uma melhora nos dados de ganho de peso, duracao da hiperfagia, taxa de crescimento e eficiencia alimentar. A privacao alimentar nao influencia a exigencia proteica em juvenis de tambaqui.