Data/hora: 10/06/2024 19:05:52

Provedor de dados: | 5
País: | France
Título: | Effects of O-2 supersaturation on metabolism and growth in juvenile turbot (Scophthalmus maximus L.)
Autores: | Person, Jeannine; Pichavant, Karine; Vacher, Coralie; Le Bayon, Nicolas; Severe, Armelle; Boeuf, Gilles.
Data: | 2002-03
Ano: | 2002
Palavras-chave: | Ion regulation; Acid base; Metabolism; Growth; Hyperoxia; Turbot.
Resumo: | Effects of O-2 supersaturation on metabolism and growth were studied in juvenile turbot (Scophthalmus maximus L.). When fish were reared for 30 days in water containing O-2 at 147% or 223% air saturation, there were no significant differences in food intake, growth, food conversion or protein utilization compared to fish exposed to normoxia (100% air saturation in water outlet). Exposure to hyperoxia resulted in increased body fat deposition. Daily rates of O-2 consumption of resting fish were not affected by O-2-concentrations, and there were no significant differences in rates of nitrogenous excretion among fish exposed to the different O-2-concentrations. Turbot tolerated severe hyperoxia, 350% air saturation, for 10 days.There were changes in acid-base balance that compensated for the respiratory acidosis resulting from O-2 supersaturation. Blood pH was regulated within 24 h (it averaged 7.69 over the 30-day experiment) by significant increases in plasma CO2 content and pCO(2). Plasma CO2 was dose dependent averaging 11.3 and 18.9 mmol l(-1) under 147% and 224% O-2 saturation, respectively, compared to 6.7 mmol l(-1) under notmoxia. Over the 30-day experiment, the only change in hydromineral balance was a slight, but non-significant decrease in plasma chloride content in fish exposed to hyperoxia (137 mmol l(-1) compared to 139 under normoxia). There were no changes in haematocrit, haemoglobin and red blood cell counts (they averaged 18.3%, 3.7 g dl(-1) and 1.37 x 10(6) mm(-3). respectively) and no signs of stress (plasma cortisol averaged 3.8 ng ml(-1)) related to exposure to O-2-supersaturation for 30 days.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/2002/publication-627.pdf

DOI:10.1016/S0044-8486(01)00689-5

Editor: | Elsevier
Relação: | http://archimer.ifremer.fr/doc/00000/627/
Formato: | application/pdf
Fonte: | Aquaculture (0044-8486) (Elsevier), 2002-03 , Vol. 205 , N. 3-4 , P. 373-383
Fonte: | 2002 Elsevier Science B.V. All rights reserved