Examination of the optimal water temperature for three-lined tonguefish <I>Cynoglossus abbreviatus</I> juvenile production

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  • Kusaka Koji
    Okayama Prefectural Technology Center for Agriculture, Forestry, and Fisheries Research Institute for Fisheries Science
  • Iwamoto Toshiki
    Okayama Prefectural Technology Center for Agriculture, Forestry, and Fisheries Research Institute for Fisheries Science

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Other Title
  • コウライアカシタビラメ種苗生産に適した飼育水温の検討
  • コウライアカシタビラメ シュビョウ セイサン ニ テキシタ シイク スイオン ノ ケントウ

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Abstract

To elucidate the optimal temperature for rearing larval three-lined tonguefish Cynoglossus abbreviatus, we examined the effects of water temperature on the growth, survival and morphological abnormalities of larvae. Larval fish were reared in seawater held at temperatures of 14 ℃, 17 ℃ or 20 ℃, or in seawater at a natural temperature (ranging from 16 to 24 ℃ over the course of the experiment), until the completion of metamorphosis. Survival and growth (total length) of larvae increased with rising water temperature. There were no significant differences between growth rates and survival in larvae reared at the natural water temperature and at 17 ℃. Survival rates were poor at 14 ℃. Morphological abnormalities, including an abnormal eye position and differences in body coloration were observed in fish reared at all temperatures. The percentage of fish that developed normally was highest at 17 ℃, and the occurrence of morphological abnormalities was highest at natural temperatures and at 20 ℃. These results suggest that the optimal temperature for rearing larval three-lined tonguefish is 17 to 20 ℃.

Journal

  • Aquaculture Science

    Aquaculture Science 65 (1), 107-113, 2017

    Japanese Society for Aquaculture Science

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