Efficient method to eradicate red swamp crayfish by using different bait traps in different orders for varying durations

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  • アメリカザリガニの駆除に使用する罠の効果的使用方法の検討
  • アメリカザリガニ ノ クジョ ニ シヨウ スル ワナ ノ コウカテキ シヨウ ホウホウ ノ ケントウ

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Abstract

The baited-trap method is recommended for capturing and eradicating the invasive crayfish, Procambarus clarkii, for biodiversity conservation and ecosystem management. However, few experimental studies have examined the efficiency of the different types of bait trap used for varying durations. Therefore this study compared the capture efficiencies of Kagoami, Anagokago, Kanikago, and Amimondori bait-traps by considering the number of crayfish captured per given period of trap operation. The number of crayfish captured increased with time after the traps were set, reached a maximum, and then decreased. Over the study period, the Kagoami and Anagokago traps had the highest trap yields; however, for short trap operations of less than 5 hours, the Amimondori trap caught as many crayfish as the Kagoami and Anagokago traps. The trap escape rate increased after the bait lost potency, and the number of crayfish that escaped was greater for traps with open entrances versus those with narrow entrances. Overall, the capture efficiencies of the traps peaked at 0.2 days for the Amimondori trap, 1-3 days for the Anagokago trap, and 7 days for the other traps. Considering the trap characteristics, we recommend using a different combination of bait traps, in different orders and for varying durations, to maximise trapping efficiency, i.e., when crayfish are abundant, operate the Amimondori trap for several hours and then shift to the Anagokago trap to ensure long-term trapping of crayfish as the crayfish density decreases.

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