Artificial burrow preference by the Japanese crayfish Cambaroides japonicus

Preference for artificial burrows by the endangered Japanese crayfish speci es Cambaroides japonicus was studied to improve its cultivation. The occupa tion of artificial burrows, which were made from straight polyvinyl chlorid e pipes of different internal diameters (Y, mm), by crayfishes of different total lengths (X, mm) was significantly (P <0.001, n=56) described by a li near regression: Y= 0.49X + 3.42 (19.0 less than or equal to X less than or equal to 70.2). Among burrows of different lengths [crayfish total length (TL) x 1, x 2, x 3, and x 4], crayfishes significantly preferred burrows th at were greater than TL x 3 (P <0.001, n=588).