The accumulation of cadmium from food and seawater by the blue mussels Mytilus edulis was studied in laboratory conditions.Cadmium uptake from food was found to be just a tenth of that from seawater.The accumulation rate was rather strongly modified by cadmium concentration in seawater.At higher concentration, both, gills and hepatopancreas were the target organs for cadmium, whereas low concentration - cadmium was stored in hepatopancreas only.Considerable fraction of the accumulated cadmium was adsorbed on shell.A distinct difference in the kinetics of cadmium adsorption on shells food and seawater was noticed.
A general problem of determining water inherent optical properties from natural light radiance distribution in the sea and its depth dependency is analysed. Expressions for light-beam attenuation coefficient of practical significance are obtained. The presence of internal sources of light energy like fluorescence and Raman scattering by water molecules is included in consideration.
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