Improvement of productivity for the early shipment of cultivated <i>Undaria pinnatifida</i>, in Shimane Peninsula using a high-temperature resistant strain obtained from crossbreeding

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  • Kanamoto Yasuyuki
    Inland Water Fisheries and Coastal Fisheries Division, Shimane Prefectural Fisheries Technology Center
  • Kiyokawa Tomoyuki
    Inland Water Fisheries and Coastal Fisheries Division, Shimane Prefectural Fisheries Technology Center
  • Sasaki Tadashi
    Inland Water Fisheries and Coastal Fisheries Division, Shimane Prefectural Fisheries Technology Center

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Other Title
  • 島根半島におけるワカメ養殖の交雑育種による高水温耐性株を用いた早期出荷による生産性向上への試み
  • Improvement of productivity for the early shipment of cultivated Undaria pinnatifida, in Shimane Peninsula using a high-temperature resistant strain obtained from crossbreeding

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Abstract

<p>In this study, a laboratory-selected high-temperature resistant strain of Undaria pinnatifida obtained from crossbreeding was evaluated for growth and productivity under three outplanting periods of varying water temperature levels: high (September 29, 2021; 25.4°C), middle (October 15, 2021; 24.4°C) and low (October 31, 2021; 22.2°C), in a cultivation site in the Shimane Peninsula. Our results showed that seedlings were lost significantly for the conventionally used strain (the control strain NT2♂NT2♀; CS) outplanted during the high-temperature period. On the other hand, the high-temperature resistant strain (IS1♂NT2♀; RS) grew well, suggesting the possibility of early shipment. Cultivation of this strain yielded shipping size U. pinnatifida with an average weight of over 100 g per individual upon harvest in early January, a period when the trading price of fresh U. pinnatifida is high. Furthermore, the January to March harvests showed that the RS outplanted during the high and middle-temperature periods produced harvest amounts that were 1.8 to 3.3 times higher than that of the CS outplanted during the low-temperature period. The use of the RS in U. pinnatifida cultivation sites is therefore expected to make a stable and improved production.</p>

Journal

  • Aquaculture Science

    Aquaculture Science 71 (1), 9-22, 2023-04-20

    Japanese Society for Aquaculture Science

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