Abstract

Crayfish eradication can be achieved in ponds with low concentrations (0.06 to 0.13 mg/L) of the insecticide fenthion (commercial formulation, BAYTEX). Fenthion is highly toxic to Orconectes limosus at concentrations as low as 0.006 mg/L. The 24-h LC50 was determined at a water temperature of 20°C ± 0.1°C. Three pond were treated with fenthion without apparent injuries to vertebrates; however, among invertebrates, arthropods were affected. Even at fenthion concentrations high enough to be harmful to fish, death of crayfish occurred only after several hours of contact with the toxicant. Fenthion remains toxic to crayfish for several weeks, even at low concentrations, so restocking of treated ponds can not be undertaken immediately.

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