Water velocity in artificial habitats of the Japanese crayfish Cambaroidesjaponicus
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.
Document Type: Research Article
Affiliations: 1: Laboratory of Marine Biodiversity,Graduate School of Fisheries Sciences, Hokkaido University, Hakodate,Hokkaido 041-8611, 2: Department ofApplied Aquabiology, National Fisheries University, Shimonoseki,Yamaguchi 759-6595 and 3: HokkaidoNuclear Energy Environmental Research Center, Kyowa, Hokkaido 045-0123,Japan
Publication date: 2003-04-01