Abstract
1. 1. The total amino acid pool increased in ventricles and gills removed from M. demissus during adaptation to high salinity. However, each major amino acid had a unique time course of accumulation. 2. 2. Initially, alanine concentration increased rapidly followed by slower accumulations of glycine and taurine. Alanine declined as the other amino acids increased. Thus the pool size remained constant following the initial elevation. 3. 3. Proline, undetected at first, increased after 1 day in the high salinity. Eventually, proline concentrations peaked, declined and disappeared again. 4. 4. Mantle tissue showed a different pattern of amino acid accumulation from the other tissues. Although alanine accumulated first, followed by glycine and proline, taurine did not increase. 5. 5. A pattern of amino acid accumulation similar to that in tissues from the whole animal was found in isolated gills and ventricles during high salinity stress.
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