Abstract

Summary.The water transport through the gills of young mussels (Mytilus edulis) has been calculated by means of photometric determinations of the percentage amount removed in unit time of the unicellular alga Synechococcus from a known quantity of a suspension of the algæ.Having found in the literature a set of figures, from which the necessary calculations could be made, a comparison with pelagic larvæ (oyster) has been possible. It has been found that 1 g larvæ will transport 6.7 l water per hour, young bottom stages 0.19 l and adults 0.01‐0.04 l water per hour and per g.

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