Abstract
The viability and mercury content of Corophium volutator (Pallas) have been recorded over a 33-day period in sediments treated with seawater solutions of 0·001, 0·1, 10 and 1000 ppm HgCl 2 . Heterotrophic bacteria have also been counted. Corophium LD 50 's (time for 50 % mortality) ranged from c. 30 days in 0·001 ppm to c. 3h in 1000 ppm HgCl 2 . The mercury concentration in animals was always higher than in the external medium and was measured by a concentration factor. The concentration factor decreased with increasing mercury concentration and was higher for dead than for living animals. Bacterial and animal mortality were closely related after day 15 but not before that time.
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