Adult male lobsters exposed to 0.06, 0.5, and 5 µg L⁻¹ azamethiphos (formulated as Salmosan®) for one hour, repeated five times, over 48 h.

Inhibition of muscle cholinesterase activity detected in lobsters exposed to 0.5 and 5 µg L⁻¹ azamethiphos.

The 5 µg L⁻¹ dose was considered lethal (93% cumulative mortality).

Significant changes in hemolymph plasma biochemistry were most apparent in the 5 µg L⁻¹ exposure group in the immediate post-exposure samples.

Citrate synthase activity was significantly lower in muscles of the 0.5 µg L⁻¹ exposure group compared to control lobsters.