%0 Journal Article
%T Dietary salt and water pH effects on growth and Na+ fluxes of silver catfish juveniles = Efeito do sal na dieta e do pH da ¨¢gua no crescimento de juvenis de jundi¨¢
%A Carlos Eduardo Copatti
%A Luciano de Oliveira Garcia
%A Daiani Kochhann
%A Mauro Alves Cunha
%J Acta Scientiarum : Animal Sciences
%D 2011
%I 
%X This study verified the optimum dietary salt level for the growth and ion regulation of silver catfish juveniles at different water pH levels (5.5, 7.0 and 9.0). The control diet was supplemented with NaCl to yield experimental diets with 0.5, 1.0 and 2.0% NaCl. Juveniles were collected at 15 and 35 days after the beginning of experiment for analyses of Na+ net fluxes. Exposure of silver catfish juveniles to alkaline or acidic water did not affect their survival. Fish fed with diets without NaCl supplementation and exposed to pH 7.0 showed significantly higher weight, length, specific growth rate and biomass per tank than those exposed to pH 5.5. Ionoregulatory disturbances of silver catfish maintained at all pH are less pronounced when fed higher dietary salt supplementation (1.0-2.0%NaCl). The increase of dietary NaCl reduced body Na+ loss and protected against the impact of acidic water on growth. Este estudo verificou o melhor n¨ªvel de dieta de sal para o crescimento e regula  o i nica de juvenis de jundi¨¢ em diferentes n¨ªveis de pH da ¨¢gua (5,5; 7,0 e 9,0). A dieta controle foi suplementada com 0,5; 1,0 e 2,0% de NaCl. Juvenis foram coletados aos 15 e 35 dias de experimento para an¨¢lise dos fluxos l¨ªquidos de Na+. A exposi  o de juvenis de jundi¨¢ para ¨¢guas ¨¢cidas ou alcalinas n o afetou sua sobreviv¨ºncia. Exemplares alimentados com dietas sem adi  o de NaCl e expostos em pH 7,0 mostraram peso, comprimento, taxade crescimento espec¨ªfico e biomassa/tanque significativamente maiores que aqueles expostos em pH 5,5. Dist¨²rbios ionorregulat¨®rios em jundi¨¢s mantidos em todos os pH s o menos pronunciados quando em exemplares alimentados com dietas com maior suplmenta  o de sal (1,0-2,0% NaCl). O aumento de NaCl na dieta reduziu a perda de Na+corporal e protegeu contra o impacto da acidez da ¨¢gua no crescimento dos juvenis.
%K acidic water
%K alkaline water
%K dietary NaCl
%K ¨¢guas ¨¢cidas
%K ¨¢guas alcalinas
%K dieta de NaCl
%U http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/11192/11192