Abstract
1. 1. The specific activities of the glycolytic enzymes in crustacean muscle are comparable to those found in rat liver, except that the ratio of glyceraldehyde-3-dehydrogenase to lactic dehydrogenase was greater in crustacean muscle (≅3 : 1) than in rat liver (1 : 4·5) or rat muscle (1 : 1·45). 2. 2. Hexokinase activity which appears to be the rate limiting step is at least fifty times greater than the theoretical minimum required to support the QO 2's observed, assuming carbohydrate carbon is supplying 100% of oxidizable substrate. 3. 3. Enzyme availability is not therefore a likely explanationation for apparently slow rate of carbohydrate utilization by crustaceans.
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