摩周湖に分布するザリガニについて CRAYFISH(CRUSTACEA, DECAPODA) IN LAKE MASHU, HOKKAIDO

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Crayfish in Lake Mashu, Hokkaido, Japan, were captured with tangle nets in the summer of 1992. All specimens, 171 males and 517 females, had intermediate diagnostic character between two subspecies, Pacifastacus leniusculus leniusculus and P, l. trowbridgii. Although three very large individuals of unidentified crayfish were captured in this lake by poachers of trout in 1975 and 1985, there is no certain confirmation because of illegal samplings. One of the present authors took a chance to measure one of them, a fresh male crayfish with very large chelae, in 1975 when he was 11 years old and recorded only its giant size, i.e. 47 cm carapace length. However, the largest P. leniusculus collected in this study was 5.7cm in c. l. Neoteny may have occurred because there is no secondary sexual character on chelae of adult P. leniusculus males. This lake has no river. Age of the lake is estimated as about 2000 years old. Further, all species of fish and crustaceans in the lake were artificially introduced from other waters. Of crayfish, only P. leniusculus occurs and was introduced from Portland, Oregon, U.S.A., in 1930. From these, the unidentified gigantic crayfish seems to have been P. leniusculus grown to a giant size.

収録刊行物

  • 甲殻類の研究

    甲殻類の研究 21(0), 73-87, 1992

    一般社団法人 日本甲殻類学会

被引用文献:  4件中 1-4件 を表示

各種コード

  • NII論文ID(NAID)
    110002698374
  • NII書誌ID(NCID)
    AN0008054X
  • 本文言語コード
    JPN
  • 資料種別
    雑誌論文
  • ISSN
    02873478
  • NDL 記事登録ID
    3828240
  • NDL 刊行物分類
    RA48;RA38
  • NDL 雑誌分類
    ZR4(科学技術--生物学--動物)
  • NDL 請求記号
    Z18-725
  • データ提供元
    CJP引用  NDL  NII-ELS  J-STAGE 
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