Abstract

Several experiments show that synthetic pyrethroids are toxic to freshwater crayfish. Laboratory studies were conducted to determine the acute toxicity of synthetic pyrethroid ciflutrin (commercial formulation Solfac WP 10 -Bayer-, with 10% active ingredient) in view of a potential eradication of red swamp crayfish (Procambarus clarkii). The effects of 10 different concentrations were tested. Ciflutrin was highly toxic to red swamp crayfish at concentrations as low as 0.04 ?g L^-1 after 48 hours of exposure. The 24 h LC₅₀ was determined at a temperature of 20±1 °C and calculated by graphic method. The values of the 24 h LC₅₀ and the 48 h LC₅₀ were respectively 0.13 ?g L^-1 and 0.08 ?g L^-1. Neurological symptoms such as loss of coordination of the movements and paralysis occurred before the death of the crayfish. In parallel, we assessed the selectivity of the insecticide, testing it on goldfish (Carassius auratus) and evaluating its toxicity and the residues in the whole carcass.

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