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¹ Inland Fisheries Institute in Olsztyn, Department of Lake Fisheries, ul. Rajska 2, 11-500 Giżycko, Poland
² Inland Fisheries Institute in Olsztyn, Department of Sturgeon Fish Breeding, Pieczarki 50, 11-610 Pozezdrze, Poland DOI : 10.4194/1303-2712-v17_2_15 Viewed : 4104 - Downloaded : 4062 From the most often used traps caught crayfish can escaping during the day. This reduces trapping yield. Therefore, those tools are used to the one-night catching. New tool for long-term catching was tested. The ability to retain crayfish inside a trap and the catch efficiency of this trap named Vulkan were compared to the popular trap named Evo in artificial and wild conditions. The tested crayfish traps differed significantly in their ability to retain crayfish. After four days (96 h) of observation in artificial conditions, 65.2% crayfish inserted into traps had escaped from Evo traps compared with 2.4% in the case of Vulkan traps. Evo traps had statistically significant (P<0.05) higher the catch efficiency as catch per unit effort (CPUE) than Vulkan traps during one-night catching in the lakes. Research showed that Vulkan traps effectively prevent the escape of caught crayfish also during the daylight surpassing in this case Evo traps and are better for use in long-term catch. They can be the basis for new research methods collecting crayfish not only for one-night catch but for an extended period of time. Also in a commercial fishery Vulkan traps may reduce the catch effort. Keywords : trap, catching, crayfish, catch efficiency, catch per unit effort (CPUE)