Abstract

1. 1. Seasonal and hormonal influences on protein metabolism were studied in the crayfish. 2. 2. Amino acid incorporation into several tissues is higher in fall-winter than at other seasons. 3. 3. Incorporation levels differ among tissues in the following descending order: green gland, gill, hypodermis, hepatopancreas, hemolymph, abdominal muscle. 4. 4. Premolt animals incorporate less amino acid into tissue protein than do intermolt animals; however, eyestalk removal results in significantly greater incorporation into all tissues. 5. 5. Eyestalk extract from intermolt crayfish decreases amino acid incorporation into green gland and hepatopancreas of premolt animals; premolt eyestalk extract decreased incorporation into hypodermis but increased it in the hepatopancreas and gill tissue.

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