北海道の小川と小湖におけるザリガニＣａｍｂａｒｏｉｄｅｓ　ｊａｐｏｎｉｃｕｓの脱皮時期と繁殖周期

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タイトル別名
  • Molting Season and Reproductive Cycle of the Japanese Crayfish, Cambaroides japonicus in a Stream and a Small Lake in Hokkaido.

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抄録

The molting season and reproductive cycle of the Japanese crayfish, Cambaroides japonicus (De Haan, 1841), in a stream and a small lake in Hokkaido, were investigated once a month from 1991 to 1992. In the warm season from Jun. to Oct., molting occurred in both habitats. The size of the smallest reproductive female was 18mm in carapace length for both habitats. The reproductive cycle of this species was as follows. Mature females copulate in Sep. and Oct., and the cement gland develops from Sep. to Nov. In Apr. or May of following year, the females spawn. They lay eggs and carry hatched juveniles for two to three months, with juveniles being released in Jul. or Aug. The smallest size of mature females was equal at both habitats. Furthermore, the reproduction and molting occurred simultaneously at both habitats.

収録刊行物

  • 水産増殖

    水産増殖 42 (3), 465-470, 1994

    日本水産増殖学会

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