| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Long-term ammonia exposure of turbot: effects on plasma parameters
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| Autores: |
Person, Jeannine
Lamers, A
Le Roux, Annick
Severe, Armelle
Boeuf, Gilles
Mayer Gostan, N
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| Data: |
2003-04
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| Ano: |
2003
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| Palavras-chave: |
Urea
Total ammonia nitrogen
Scophthalmus maximus
Ion regulation
Cortisol
Chronic toxicity
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| 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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/2003/publication-618.pdf
DOI:10.1046/j.1095-8649.2003.00073.x
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| Editor: |
Blackwell science
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| Relação: |
http://archimer.ifremer.fr/doc/00000/618/
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| Formato: |
application/pdf
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| Fonte: |
Journal of Fish Biology (0022-1112) (Blackwell science), 2003-04 , Vol. 62 , N. 4 , P. 879-894
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| Direitos: |
2003 Blackwell Publishing, Inc.
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