水温と光周期調整によるイシダイの産卵制御  [in Japanese] Control of Spawning in the Japanese Parrotfish, Oplegnathus fasciatus, by Manipulation of Water Temperature and Photoperiod  [in Japanese]

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Abstract

クロマグロ仔魚の餌料として6月から9月にイシダイのふ化仔魚を得るため, 水温と光周期を調整してイシダイの産卵期の制御方法を検討した。対照区は自然水温, 自然日長で飼育した。水温調整区では収容後水温を15℃に低下させ, 6月下旬以降は水温を20~24℃に維持した。水温+光周期調整区では同様の水温調整に加えて, 3月下旬から短日処理を行い, 6月下旬からは自然日長, 7月中旬からは長日処理を行った。3区ともに親魚を収容した直後から産卵がみられたが, 対照区以外では産卵が停止し, その後再開した。対照区の産卵期間は3月中旬から8月中旬であり, 水温調整区では主に5月末から9月初旬に産卵し, 水温+光周期調整区では6月下旬から10月下旬まで産卵が継続した。この結果, 水温のみの調整でもイシダイの産卵制御は可能であるが, 光周期も調整することで長期にわたって産卵を制御できることが明らかになった。

Control of spawning was carried out to obtain hatched larvae of Japanese parrotfish, <I>Oplegnathus fasciatus</I>, from June to September as live food for <I>Thunnus orientalis</I> (bluefin tuna) larvae. Sixty females and thirty males were divided equally into three groups in mid-March, 2000. The control group (Group C) was reared under natural water temperature and photoperiod conditions. The water temperature-treated group (Group W) was reared at 15°C from late March to late June and at 20-24°C from late June to the end of the spawning season under natural photoperiod conditions. The water temperature and photoperiod-treated group (Group W+P) was reared under the same temperature conditions as Group W, but was treated with photoperiods of 6L/18D to late June, 14L/10D from early July and 16L/8D from late August to the end of the spawning season. The main spawning season of Group C was mid-May to mid-August; that of W was late May to early September; and that of W+P was from late June to late October. These results indicate that both water temperature and photoperiod manipulation is effective in delaying the spawning season of this species.

Journal

  • Aquaculture Science

    Aquaculture Science 50(2), 189-196, 2002-06-20

    Japanese Society for Aquaculture Science

References:  18

Cited by:  1

  • 光放射の応用  [in Japanese]

    河本 康太郎 , 佐々木 政子 , 白水 俊次 , 田澤 信二 , 戸田 淨 , 谷口 正成 , 木下 忍 , 田中 總太郎 , 木村 嘉孝

    Journal of the Illuminating Engineering Institute of Japan 87(8), 691-701, 2003-08-01

    References (286)

Codes

  • NII Article ID (NAID)
    10008750652
  • NII NACSIS-CAT ID (NCID)
    AN00124667
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    03714217
  • NDL Article ID
    6212564
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-761
  • Data Source
    CJP  CJPref  NDL  J-STAGE  JASI 
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