Abstract
Triploid Atlantic salmon ( Salmo salar) were identified using flow cytometry to measure the relative DNA content of red blood cells. The affinity of the triploid salmon blood for oxygen ( P50) was the same as that of diploids. However, the hemoglobinoxygen loading ratio (Hufner's constant) for the triploid salmon was only 77% of the diploid values. The reduced hemoglobin-oxygen loading ratio, in concert with lower blood hemoglobin concentration, resulted in the triploid salmon having a maximum blood oxygen content which was only 68% of that of the diploids. Although a reduced ability to transport oxygen may not be deleterious to resting fish, it may hinder the triploids' ability to obtain oxygen under conditions that require exertion.
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