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We tested four commercial disinfectants against crayfish plague (Aphanomycesastaci) spores in both aquatic solutions and with material mimicking fishingand crayfishing gear, e.g. traps, ropes, mesh, etc. The testeddisinfectants were Proxitane®5:14, Proxitane®12:20, Wofasteril®E400, Virkon®Sand hydrogen peroxide. The effects of the chemicals were initially tested in liquidzoospore cultures and the effective concentrations were then further tested using cleanand dirty model materials (PP sheet, nylon rope, cotton fabric) contaminated withA. astaci spore solutions. The disinfectants effective againstinfective crayfish plague spores with both clean and dirty model materials wereProxinate®5:14(effective concentration was 30 mg·L-1 of PAA) and Virkon®S(3 g·L-1), while Proxinate®12:20(10 mg·L-1 of PAA) and Wofasteril®E400(30 mg·L-1 of PAA) worked only with clean model materials. Hydrogen peroxidewas not effective in the tested concentrations and conditions. Based on the results, thedisinfectants most suitable for the fishing and crayfishing gear disinfection would beProxitane®5:14and Virkon®S,with the condition that all the gear should be thoroughly cleaned of organic matter toensure inactivation of A. astaci spores

Practical disinfection chemicals for fishing and crayfishing gear against crayfish plague transfer