Control of Spawning in the Japanese Parrotfish, Oplegnathus fasciatus, by Manipulation of Water Temperature and Photoperiod.

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  • 水温と光周期調整によるイシダイの産卵制御
  • スイオン ト ヒカリ シュウキ チョウセイ ニ ヨル イシダイ ノ サンラン セイギョ

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Abstract

Control of spawning was carried out to obtain hatched larvae of Japanese parrotfish, Oplegnathus fasciatus, from June to September as live food for Thunnus orientalis (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

    Japanese Society for Aquaculture Science

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