若狭湾沖に生息するズワイガニの産卵数  [in Japanese] Fecundity of snow crab Chionoecetes opilio off Wakasa Bay in the Sea of Japan  [in Japanese]

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Abstract

若狭湾沖に生息する最終未成体齢と若い成体(最終脱皮後<4 年)のズワイガニが持つ卵巣卵数は,共に甲幅と正の相関にあり,前者の卵数は後者の 62.8% と少なかった。これは卵巣発達時における体サイズの違いが原因しているとみられる。初産ガニと若い経産ガニ(1.5~<4 年)が持つ腹肢付着卵数も,共に甲幅と正の相関にあったが,前者の付着卵が未成体の卵巣に,後者の付着卵が若い成体の卵巣に由来していることから,前者は後者の 66.3% であった。高齢の経産ガニ(>4 年)が持つ両卵数は,甲幅との間に有意な関係が認められないうえ少なかった。<br>

  To determine fecundity, female snow crabs <i>Chionoecetes opilio</i> were caught off Wakasa Bay. The number of oocytes for pubescent females (prior to the terminal molt; mean carapace width 66.2 mm previously reported off Wakasa Bay) and for young adults (spawners less than 4 years after the terminal molt; 77.4 mm) correlated with the carapace width. However, the number of oocytes for pubescent females was 62.8% that of young adults. The difference in the number of oocytes might be caused by the body size when they developed their ovaries. Because the number of eggs attached to pleopods for primiparae (primary spawners) and young multiparae (repeat spawners within 1.5 to <4 years after the terminal molt) originated during the ovarian development of pubescent females and young adults, respectively, the number of eggs for primiparae was 66.3% that of young multiparae. The number of oocytes and eggs for aged multiparae (more than 4 years after the terminal molt) was less than those for young multiparae and there was no correlation with their carapace width, probably because of the decline of ovarian activity in addition to insufficient number of sperm to accomplish full fertilization.<br>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 72(4), 673-680, 2006-07-15

    The Japanese Society of Fisheries Science

References:  42

Cited by:  3

Codes

  • NII Article ID (NAID)
    110004818347
  • NII NACSIS-CAT ID (NCID)
    AN00193422
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    00215392
  • NDL Article ID
    8051293
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-345
  • Data Source
    CJP  CJPref  NDL  NII-ELS  IR  J-STAGE 
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