Table 1

Number of crayfish captured at each site and the species of branchiobdellidans in the Atsubetsu River system.

Host crayfish Branchiobdellidans
Site Date Latitude Longitude Species Number Species
Site 1 30 Aug. 2022 42.93534 N 141.42446 E P. leniusculs 75 S. tetrodonta
C. cirratus complex
Site 2 24 Aug. 2021 42.93079 N 141.41415 E C. japonicus 2 C. digitatus
Site 3 24 Aug. 2021 42.93111 N 141.41741 E C. japonicus 4 C. digitatus
Site 4 7 Sep. 2021 42.92880 N 141.40734 E C. Japonicus 4 C. digitatus
Site 5 15 Jul. 2022 42.94113 N 141.42438 E C. japonicus 4

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