Abstract
Larval lobsters ( Homarus americanus), juvenile lobsters, adult lobsters ( H. americanus), species of zooplankton, species of phytoplankton, mussels ( Mytilus edulis) and periwinkles ( Littorina littorina) were exposed to dichlorvos at various concentrations in the laboratory and mortalities were recorded. Dichlorvos was also released from an ocean field site and at a fish farm while stage IV larval or juvenile lobsters ( H. americanus) were suspended in the water column in areas adjacent to the release site to determine the effects of dichlorvos on their survival. Results indicate that dichlorvos is not toxic to mussels or periwinkles at 1.0 ppm, for 1 h exposure, but is toxic to larval lobsters, adult lobsters, zooplankton and phytoplankton. In field trials larval and juvenile lobsters housed adiacent to sea-cage operations were not killed following treatment with dichlorvos.
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