Abstract
Inorganic and organic Hg accumulation from food by the crayfish Orconectes propinquus was studied in the laboratory. Animals were fed pellets of dried cat food dosed in 1 jig g−1 dw with 203Hg labeled HgCl2 and CH3HgCl over a two-week period. This was followed by a three-week depuration period which crayfish were fed uncontaminated food. At the end of each of these periods body tissues were analyzed for labeled Hg. 203Hg uptake from HgCl2 followed the ranking: hepatopancreas > gills > exoskeleton > muscle. In all tissues there was evidence of Hg uptake from water via leaching from food although uptake was principally from food. Mercury uptake from CH3HgCl followed the ranking: gills > muscle > hepatopancreas > exoskeleton. Only Hg accumulated from HgCl2 by the hepatopancreas failed to depurate over the next three weeks. Mercury uptake by the hepatopancreas from CH3HgCl was negligible. Results suggest a more rapid turnover of Hg in crayfish than in finfish.
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