Abstract
ABSTRACT Several tissues excised from stage A individuals of Callinectes sapidus accumulated L-lactate and, to a limited extent, alanine when exposed to hypoxia in vitro. Succinate did not accumulate, suggesting that alternative pathways of anaerobic metabolism are not used in early postmolt stages. In premolt animals hexokinase activity rose in the epidermis but not in the swimming and heart muscles. Pyruvate kinase and lactate dehydrogenase decreased in swimming muscle but not in other tissues of premolt crabs. No changes in glucokinase activity, which was very low, were detected in any premolt tissues. The kinetic properties of the pyruvate kinase and lactate dehydrogenase found in swimming muscle of stage C animals were similar to those reported for other crustaceans. The lactate dehydrogenase is more suited for lactate production than utilization, which is correlated with the dependence on anaerobic metabolism during sustained motor activity.
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