Survival and growth of the Japanese crayfish Cambaroides japonicus in a small stream in Hokkaido
Abstract:Growth over the life cycle, including seasonal variation, of the Japanese crayfish, Cambaroides japonicus (de Haan, 1841), was examined for a population found in a stream in Hokkaido, northern Japan. The growth equation estimated for males was Lt = 106.6 (1-exp (−0.02987 (0.08333t + 0.9444 + 0.3279 sin (0.5236t − 0.6947)))) and for females, Lt = 126.2 (1-exp (−0.02413 (0.08333t + 1.213 + 0.2768 sin (0.5236t − 1.548)))), where Lt is the carapace length (mm) measured from the posterior of the eye socket to the posterior margin of the carapace at age t (months after settlement in July). The longevity of males is estimated to be 11 yr, and females 10 yr. Both sexes become sexually mature 5 or 6 yrs after hatching.
Document Type: Research Article
Publication date: July 1, 1997
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