THE HORMONAL CONTROL OF METABOLISM IN CRUSTACEANS. IX. CARBOHYDRATE METABOLISM IN THE TRANSITION FROM INTERMOULT TO PREMOULT IN CARCINIDES MAENAS

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Abstract
The changes in blood carbohydrate, blood lipochromes, total body carbohydrate, non-protein nitrogen and ammonia nitrogen, and the effects of eyestalk removal on these values, were followed in a population of Carcinides maenas (Pennant) maintained in the laboratory. During the period of observation, there was a progression from late intermoult to early premoult stages. The change from intermoult to premoult was signaled by the appearance of relatively large amounts of lipochromes in the blood and integument, and by an increase in body carbohydrate. These changes preceded any morphological signs of premoult. Eyestalk extirpation increased the body carbohydrate of animals which had not undergone this increase spontaneously; lipochrome content was not changed. The other quantities measured showed no change attributable to intermoult stage or eyestalk removal.