The effect of photochemical efficiency in cultivated <i>Pyropia</i> sporophytes under the conchospore-release suppression treatment resulting from postponement of seeding date

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  • NAKAMURA RUMINA
    Graduate School of Agriculture, Forestry and Fisheries, Kagoshima University
  • IWANAGA TAKUYA
    Saga Prefectural Ariake Fisheries Research and Development Center (SAFREDEC)
  • NAKAHARA KEITA
    Saga Prefectural Ariake Fisheries Research and Development Center (SAFREDEC)
  • SUMIYOSHI DAI
    Faculty of Fisheries, Kagoshima University
  • TERADA RYUTA
    United Graduate School of Agricultural Sciences, Kagoshima University

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Other Title
  • ノリ養殖採苗日の延期に伴って行われる殻胞子放出抑制処理がカキ殻糸状体の光合成光化学効率に及ぼす影響

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<p>　This study examined the effect of photochemical efficiency (ΔF/Fm′) in cultivated sporophytes of Pyropia yezoensis f. narawaensis under the conchospore-release suppression treatment resulting from postponement of seeding date. Two types of treatment were used to preserve sporophytes: Exp#1) Preservation in a dark aquarium tank; Exp#2) Preservation with moistened fabrics, without seawater, sealed in containers. Experiments were conducted under these two treatments for 7 days at 18 and 24℃ in the dark. In Exp#1, ΔF/Fm′ gradually decreased after culturing for more than 3 days. However, at 18℃, the values almost returned to their initial levels within one day after removing the shading. Even after the shading was removed, the values had not fully recovered after culturing for 5 and 7 days at 24℃. In Exp#2, ΔF/Fm′ was well maintained throughout the 7-day culture period at 18℃. In contrast, at 24℃, the values gradually decreased as the culture duration extended; however, after rehydration in seawater with the shading removed, the values almost fully recovered. In commercial cultivation, fishermen typically conduct these treatments for a duration of up to 3 days, suggesting that physiologically, treatments within this 3-day timeframe are likely to be appropriate.</p>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 89 (6), 521-528, 2023-11-15

    The Japanese Society of Fisheries Science

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