Olfactory Response and Fenitrothion Toxicity in American Lobsters (Homarus americanus)

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Abstract
In test runways the olfactory response of American lobsters (Homarus americanus) to cod muscle extract is not affected by simultaneous presentation of fenitrothion at measured concentrations ranging from 0.05 to 25.4 ppb at time of stimulation.Larval and adult lobsters have similar sensitivity to fenitrothion. For both, the 96-h LC50 is about 1 ppb. The lethal threshold for larvae is about 0.015 ppb, that for adults is 0.3 ppb or lower.