Abstract
1. 1. Blood parameters determining oxygen capacity and oxygen affinity were measured in brown trout at different times of the year. 2. 2. Haematological data indicate a slight decrease in blood oxygen capacity during the warm seasons. 3. Oxygen affinity increases significantly during summer and decreases in winter. 3. 4. The changes in P 50 exhibited a positive correlation with the amount of anodic haemoglobin components, and a negative correlation with the amount of cathodic haemoglobin components. 4. 5. The changes observed in the [ATP]/[Hb] molar ratio were not correlated with oxygen affinity and gave values near one. 5. 6. We conclude that the oxygen affinity increase could be a physiological adaptation to oxygen transport during the wanner period. A possible mechanism is discussed.
Published Version
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