Data/hora: 16/06/2024 04:33:20

Provedor de dados: | 45
País: | Brazil
Título: | Effect of cortisol on some osmoregulatory parameters of the teleost, Oreochromis niloticus L., after transference from freshwater to seawater
Autores: | Fontaínhas-Fernandes,A.; Gomes,E.F.; Reis-Henriques,Mª.A.; Coimbra,J.
Data: | 2003-10-01
Ano: | 2003
Palavras-chave: | Tilapia Oreochromis niloticus; Freshwater; Salt water; Cortisol.
Resumo: | This trial was conducted in order to determine the effects of cortisol on salt water acclimation of tilapia Oreochromis niloticus (L.). Tilapia (n=42) were injected intraperitoneally with cortisol and then were directly transferred from freshwater (FW) to 15‰ salt water (SW). Changes in plasma osmolality, chloride ion concentration (Cl-), plasma level of cortisol and gill Na+, K+-ATPase activity were measured at 6, 12, 24, 48, 72 and 168 hours after transference to 15‰ SW. Plasma osmolality and Cl- increased immediately after transference until 12-24 h. The fish injected with cortisol (F) showed higher plasma levels of cortisol than those from control group (C) that maintained the initial levels during the experiment. Gill Na+, K+-ATPase activity of C fish began to increase at first hours after transference and peak at 48h. The differences between gill Na+, K+-ATPase activity of F and C groups were significant (P&lt;0.05) in FW, which confirm the effect of exogenous cortisol.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352003000500008
Editor: | Universidade Federal de Minas Gerais, Escola de Veterinária
Relação: | 10.1590/S0102-09352003000500008
Formato: | text/html
Fonte: | Arquivo Brasileiro de Medicina Veterinária e Zootecnia  v.55 n.5 2003
Fonte: | info:eu-repo/semantics/openAccess