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image of Journal of Crustacean Biology

ABSTRACT The time course of change in rates of oxygen consumption by whole bodies and isolated tissues and the levels of total carbohydrates, glycogen, proteins, amino acids, and the activity levels of succinate, isocitrate, lactate and glucose-6-phosphate dehydrogenase, phosphorylase, aspartate and alanine aminotransaminase, and glutamate dehydrogenase were measured over a period of 3 weeks after ablation of eyestalks, with or without injection of eyestalk extracts, and in postmolt Oziotelphusa senex senex. The results support the inference that one or more principles, presumably of neurosecretory origin, are secreted during intermolt by the eyestalks and act to restrain total metabolism as indicated by oxygen consumption and inhibition of dehydrogenases in the tissues and to regulate carbohydrate and protein metabolism as indicated by hyperglycemia and hypoproteinemia. The parameters studied fall into 2 categories, according to whether the changes are more or less in early stages of destalking (≤ 7 days) or in later stages (≥ 14 days). The time sequence of changes after ablation of eyestalks are different and the pattern of response to injection of eyestalk extract indicates that a period after eyestalk ablation intervenes before induced premolt condition.


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