Efeito do cortisol sobre parâmetros de osmorregulação do teleósteo, Oreochromis niloticus L., após a transferência de água doce para água salgada

Autor:	António Fontaínhas-Fernandes, Joaquim Luís Coimbra, E. Gomes, Ma.A. Reis-Henriques
Předmět:	tilapia Oreochromis niloticus água salgada General Veterinary biology Chemistry cortisol biology.organism_classification osmorregulação água doce Oreochromis Animal science salt water freshwater tilápia Oreochromis niloticus
Zdroj:	Scopus-Elsevier Arquivo Brasileiro de Medicina Veterinária e Zootecnia v.55 n.5 2003 Arquivo brasileiro de medicina veterinária e zootecnia Universidade Federal de Minas Gerais (UFMG) instacron:UFMG CIÊNCIAVITAE Arquivo Brasileiro de Medicina Veterinária e Zootecnia, Volume: 55, Issue: 5, Pages: 562-567, Published: OCT 2003
Popis:	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
Databáze:	OpenAIRE
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