Abstract
1. 1. Total protein content in the crayfish hepatopancreas exhibits a certain rhythm: the level rhythm: the level falls in postmolt, rises in stage C4, decreases again from D0 to D1″ and then increases in D2–D3. 2. 2. Electrophoregrams of soluble extracts show some proteins with a high mol. wt (about 400,000 wt (about 400,000 daltons) but many fractions have a small mol. wt (below 100,000 daltons). 3. 3. Four proteases and three amylases have been observed. 4. 4. Four groups of fractions exhibit evident asynchronous quantitative variations throughout the molting cycle. 5. 5. Several fractions cross-react with an antihemolymph serum.
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