Dietary salt and water pH effects on growth and Na+ fluxes of silver catfish juveniles

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...

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Published inActa scientiarum. Animal sciences Vol. 33; no. 3; pp. 261 - 266
Main Authors Copatti, Carlos Eduardo, Garcia, Luciano De Oliveira, Kochhann, Daiani, Cunha, Mauro Alves, Baldisserotto, Bernardo
Format Journal Article
LanguageEnglish
Published Editora da Universidade Estadual de Maringá - EDUEM 01.09.2011
Subjects
VETERINARY SCIENCES
dietary NaCl
dieta de NaCl
acidic water
águas ácidas
águas alcalinas
alkaline water
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Summary: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.
ISSN:1806-2636
1807-8672
1807-8672
DOI:10.4025/actascianimsci.v33i3.11192