Water velocity in artificial habitats of the Japanese crayfish Cambaroidesjaponicus |
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| Authors: | KAZUYOSHI NAKATA TATSUO HAMANO KEN-ICHI HAYASHI and TADASHI KAWAI |
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| Institution: | Laboratory of Marine Biodiversity,Graduate School of Fisheries Sciences, Hokkaido University, Hakodate,Hokkaido 041-8611,; Department ofApplied Aquabiology, National Fisheries University, Shimonoseki,Yamaguchi 759-6595 and; HokkaidoNuclear Energy Environmental Research Center, Kyowa, Hokkaido 045-0123,Japan |
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| Abstract: | ABSTRACT: The appropriate water velocity in artificial burrows for theJapanese crayfish species Cambaroides japonicus was studied.An experimental system of two artificial burrows (burrows A and B)of the same size was set in a large tank. The velocity of burrowA was 0 cm/s and that of burrow B was varied andset at 0 cm/s, 5 cm/s, 10 cm/s,20 cm/s and 30 cm/s. The selectionof these two burrows by C. japonicus was observed. No animalsselected burrow B significantly more than burrow A above 10 cm/s.At 20 cm/s, some crayfishes were swept away andcould not return to burrows because of the high water velocity.At 30 cm/s, most animals were swept away. We concludethat the appropriate water velocity for the suitability of artificialburrows and the immediate foraging area adjacent to the burrowsshould be as low as 5 cm/s. |
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| Keywords: | artificial burrow Cambaroidesjaponicus crayfish watervelocity |
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