Data/hora: 10/06/2024 12:57:23

Provedor de dados: 	Institutional Archive of Ifreme (ArchiMer)	
País: 	France	
Título: 	Long-term ammonia exposure of turbot: effects on plasma parameters	
Autores: 	Person, Jeannine; Lamers, A; Le Roux, Annick; Severe, Armelle; Boeuf, Gilles; Mayer Gostan, N.	
Data: 	2003-04	
Ano: 	2003	
Palavras-chave: 	Urea; Total ammonia nitrogen; Scophthalmus maximus; Ion regulation; Cortisol; Chronic toxicity.	
Resumo: 	Turbot juveniles were exposed to four ammonia concentrations [0.17 (L), 0.34 (M), 0.73 (MH) and 0.88 (H) mgl(-1) NH3-N] for different exposure durations (28 days minimum to 84 days). Their physiological status and growth performances were compared to a control group [0.004 (C) mgl(-1) NH3-N]. No growth was observed in the H group, and by day 57, mass increase in the MH group was only 15% of that in group C. During the first month growth in the L group was similar to that in control group while it was lower (33%) in the M group; afterwards the L and M groups had a similar growth (half that of controls). Accumulation of total ammonia nitrogen (TA-N) in plasma was dependent on ambient ammonia concentrations. Plasma urea levels in ammonia-exposed fish were lower, similar or greater than ill controls (depending oil ammonia concentration or exposure duration). Osmolarity, Cl- and Na+ plasma concentrations were stable in the L and M groups. The increases in Na+, Cl-, K+ and total Ca concentrations observed by the end of the experiment in the H and MH groups suggest that fish failed to adapt. There was all initial rise in plasma cortisol in all ammonia-exposed groups followed by a return to basal level (1.7-4 ngml(-1)) in the L and M groups. In group M H, plasma cortisol peaked at 42 ngml(-1) by day 14, and after a decline at c. 1 month (14 ngml(-1)), it rose again.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/2003/publication-618.pdf

DOI:10.1046/j.1095-8649.2003.00073.x	
Editor: 	Blackwell science	
Relação: 	http://archimer.ifremer.fr/doc/00000/618/	
Formato: 	application/pdf	
Fonte: 	Journal of Fish Biology (0022-1112) (Blackwell science), 2003-04 , Vol. 62 , N. 4 , P. 879-894	
Fonte: 	2003 Blackwell Publishing, Inc.