石狩湾におけるシャコの産卵期 Spawning Season of the Japanese Mantis Shrimp Oratosquilla oratoria (De Haan) in Ishikari Bay, Hokkaido, Japan

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The spawning season of the Japanese mantis shrimp <i>Oratosquilla oratoria</i> (De Haan) was examined in Ishikari Bay. The spawning season was estimated based on the temporal changes of female gonad somatic index (GSI) and sex ratio (number of female individuals/total number of individuals×100(%)) obtained from data between 1989 and 1991. The female GSI gradually increased from April to June, decreased in July, and began to increase again after October until November. However, GSI in November did not attain the value in the next spring. The sex ratio was low between mid June and July and high in May and November. Changes of sex ratio show the difference between male and female activities outside their burrows. The extreme low sex ratio is caused by the egg nursing behavior of females in the burrow. The spawning season of <i>O. oratoria</i> in Ishikari Bay was between June and July and once a year.

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  • 日本水産学会誌  

    日本水産学会誌 64(3), 453-461, 1998-05-15 

    日本水産學會

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各種コード

  • NII論文ID(NAID)
    10004853521
  • NII書誌ID(NCID)
    AN00193422
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00215392
  • NDL 記事登録ID
    4482241
  • NDL 雑誌分類
    ZR26(科学技術--農林水産--水産)
  • NDL 請求記号
    Z18-345
  • データ提供元
    CJP書誌  CJP引用  NDL  IR  J-STAGE 
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