A comparative study of blood oxygen transport in turbot and sea bass: effect of chronic hypoxia
International audience A comparative study of blood oxygen binding and carrying capacities of turbot Scophthalmus maximus and sea bass Dicentrarchus labrax , two fish species differing in their demand for oxygen, was carried out under three levels of chronic hypoxia ( P o 2 = 93, 65 and 40 mmHg) for...
Published in: | Journal of Fish Biology |
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Main Authors: | , , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2003
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Subjects: | |
Online Access: | https://hal.univ-brest.fr/hal-04473443 https://doi.org/10.1046/j.1095-8649.2003.00089.x |
Summary: | International audience A comparative study of blood oxygen binding and carrying capacities of turbot Scophthalmus maximus and sea bass Dicentrarchus labrax , two fish species differing in their demand for oxygen, was carried out under three levels of chronic hypoxia ( P o 2 = 93, 65 and 40 mmHg) for 40 days. Blood O 2 affinity in normoxia was moderately high in both species ( P 50 was c . 12–13 mmHg at pH 7·7). The Bohr factor was significantly lower in turbot (−0·52) than in sea bass (−0·85). In both species, blood O 2 affinity was not significantly affected by oxygen depletion whatever its level and duration. In turbot, however, P 50 appeared to slightly decrease at the two more severe levels of hypoxia. In both species, blood O 2 carrying capacity was not affected by hypoxia and remained twice as high in sea bass than in turbot. |
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