| Registro completo |
| Provedor de dados: |
Arq. Bras. Med. Vet. Zootec.
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| País: |
Brazil
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| Título: |
Effect of cortisol on some osmoregulatory parameters of the teleost, Oreochromis niloticus L., after transference from freshwater to seawater
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| Autores: |
Fontaínhas-Fernandes,A.
Gomes,E.F.
Reis-Henriques,Mª.A.
Coimbra,J.
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| Data: |
2003-10-01
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| Ano: |
2003
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| Palavras-chave: |
Tilapia Oreochromis niloticus
Freshwater
Salt water
Cortisol
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| 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<0.05) in FW, which confirm the effect of exogenous cortisol.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352003000500008
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| Editor: |
Universidade Federal de Minas Gerais, Escola de Veterinária
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| Relação: |
10.1590/S0102-09352003000500008
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| Formato: |
text/html
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| Fonte: |
Arquivo Brasileiro de Medicina Veterinária e Zootecnia v.55 n.5 2003
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| Direitos: |
info:eu-repo/semantics/openAccess
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