Abstract
1. 1. The presence of both salmon calcitonin (CT) and human calcitonin gene-related peptide (CGRP) was investigated in tissues of Palaemon serratus. 2. 2. The variation of these two molecules was studied as a function of the molt cycle. 3. 3. The highest salmon CT concentration was found in the eyestalks and heart whereas CGRP was mainly concentrated in the heart, gills and eyestalks. 4. 4. In the eyestalk, both CT and CGRP-like immunoreactivity were maximal at the B stage. In the haemolymph, the calcium fall observed in the B stage was correlated with the CT increase. No correlation appeared between the circulating calcium and the CGRP concentration.
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