Tolerance of signal crayfish (Pacifastacus leniusculus) to Persteril 36 supports use of peracetic acid in astaciculture

Peracetic acid (PAA) is useful in treating a wide variety of serious fish diseases in aquaculture. As no information on PAA toxicity to crayfish is available, we conducted acute toxicity tests of Persteril 36, a commercial PAA-containing product, on three age/size classes of signal crayfish, Pacifastacus leniusculus. Results confirmed high tolerance of the target species to this product, expressed as a 96 h LC50 of 77.3 ± 1.0 mg L− 1 PAA in adults and low post-treatment mortality in 9 month old juveniles. As PAA concentrations successfully applied in aquaculture are generally 2.0 mg L− 1 or lower, PAA can be recommended for use in astaciculture. After necessary evaluations, uses might include limiting spread of crayfish plague, treating saprolegniosis on artificially incubated crayfish eggs, and avoiding translocations of further crayfish-related non-native species when introducing crayfish or stocking them in closed culture systems.