The accumulation of dissolved zinc by the shore crabCarcinus Maenas(L.)

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Abstract
The uptake and accumulation of zinc by the shore crab Carcinus maenas have been studied in different dissolved Zn concentrations. Carcinus mamas accumulated about 2, 10 and 200% of its initial load of Zn on exposure to 23, 100 and 3162 µg l−1 radioactively labelled Zn respectively for 21 days. No significant Zn excretion was observed in crabs exposed to 100 µg Zn l−1 suggesting that C. maenas normally maintains a relatively unchanged body Zn content by maintaining a low Zn uptake rate, rather than a high Zn turnover rate. Zn excretion did occur when crabs were exposed to the environmentally high concentration of 3162 µg Zn l−1. The exoskeleton was found to be an important storage site for Zn absorbed from solution.

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