Abstract
The effects of hypoxia on haemoglobin electrophoresis and erythrocyte adenosine triphoshate (ATP) levels were studied in Cyprinus carpio, Sarotherodon mossambicus and Salmo gairdneri. Marked interspecies differences were recorded in the percentage composition of the various haemoglobin fractions and ATP levels for the three freshwater fish species under standard laboratory conditions. No significant intraspecies differences, however, were recorded in the haemoglobin components for the three treatment groups. ATP levels, on the other hand, declined with a reduced oxygen saturation of the aquarium water in all three species. It is concluded that the organo-phosphate levels in erythrocytes are responsible for changes in the oxygen affinity of fish haemoglobins and that no conformational changes in the haemoglobins of freshwater fish are anticipated under hypoxic conditions.
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