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Summary
The in vitro activities of the two dehydrogenases of the hexose monophosphate shunt have been measured in muscle, brain and liver extracts of Tilapia sparrmanii. Muscle extracts have negligible or no activity, and the temperature history of the fish has insignificant effects upon the Vmax of brain or liver dehydrogenases. Evidence is presented that rerouting via the hexose monophosphate shunt during temperature acclimation does not occur.