Uptake of dissolved amino acids from natural sea water in the musselMytilus edulisL.

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Abstract
The concentration of dissolved primary amines in shallow brackish water of the Isefjord, Denmark, varied annually from about 0.5 to about 2µM taurine-equivalents, with low values during winter and early spring and high from July to October. The fraction of primary amines, presumably amino acids, absorbed by mussels from the locality varied from zero to almost 100%, the lowest values being measured in December-March, the highest in July-October. Calculations showed that the uptake of amino acids from natural sea water measured in mussels from July to October corresponded to about twice the metabolic requirements of the gills. These estimates appear unrealistically high, and it is suggested that they may not be representative for conditions in nature.