ケガニ幼生の生残, 発育および摂餌に及ぼす水温の影響  [in Japanese] Effects of water temperature on survival, development and feeding of larvae of the horsehair crab Erimacrus isenbeckii (Crustacea, Decapoda, Brachyura) reared in the laboratory  [in Japanese]

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Abstract

ケガニ幼生の適正飼育水温を明らかにする目的で,ふ化幼生を 2 L ビーカーに収容し,水温 6~21℃(3℃ 間隔)で飼育した。生残率は 6~15℃ で高値を示し,21℃ では第 3 齢から第 4 齢にかけて,18℃ ではメガロパへの変態期から第 1 齢稚ガニにかけて大量に減耗した。各齢期までの所要日数は 15℃ まで水温の上昇にともない減少し,第 1 齢稚ガニまでの所要日数の変動係数は 15℃ 以上で大きかった。また,頭胸甲長は水温が低いほど大きく,摂餌数は 9~15℃ で多かった。以上のことから,適正飼育水温は 9~12℃ と結論付けた。<br>

  To determine the optimal rearing temperature for the larval horsehair crab <i>Erimacrus isenbeckii</i>, newly hatched larvae were reared in groups of 50 in 2-L beakers, the water temperature in which was regulated to 6, 9, 12, 15, 18, 21°C, respectively. Survival rates of larvae were high in the beakers at 6 to 15°C; however, mass mortality occurred in the beakers at 21°C from the third to fourth zoeal stage and at 18°C from the fifth zoeal stage through megalopa to first crab stage. The number of days required to reach each larval stage decreased with increasing temperature to 15°C. The coefficient of variation of the number of days required to reach the first crab stage was high in the beakers at ≥15°C. Carapace length tended to increase with decreasing temperature. The numbers of prey eaten by larvae were high at 9 to 15°C. We concluded that the optimal rearing temperature range for larvae of the horsehair crab was from 9 to 12°C.<br>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 73(6), 1081-1089, 2007-11-15

    The Japanese Society of Fisheries Science

References:  31

Cited by:  3

Codes

  • NII Article ID (NAID)
    110006530884
  • NII NACSIS-CAT ID (NCID)
    AN00193422
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    00215392
  • NDL Article ID
    9278335
  • 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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