Abstract
Lobsters, Homarus americanus, were exposed in a flow-through system to a sublethal concentration of zinc (Zn++) for 4 d and then transferred to flowing unspiked sea water for 7 d. The concentrations (μg/g dry weight) of Zn++ after the four days of exposure were in the order gill > green gland > haemolymph > hepatopancreas > crusher tissue > crusher muscle > pincer tissue > shell > testes > heart > pincer muscle > abdominal (tail) muscle. After 7 d in unspiked water the concentration of Zn++ in each of the tissues decreased, but did not return to pre-exposure levels. In terms of the total tissue burden the level of Zn++ in only the hepatopancreas continued to increase during the depuration phase. The data were analysed using a four-compartment model with haemolymph as the “central” compartment. The exchange of Zn++ between gills and water was rapid, between gills and haemolymph was somewhat slower, and between haemolymph and tail muscle was extremely slow.
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