Thallus fragmentation and culture temperature and salinity conditions for induction of maturation of <I>Ulva mediterranea</I>

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  • Shimada Yushi
    Chiba Prefecture Fisheries Research Center, Tokyo Bay Fisheries Laboratory Chiba Prefecture Agriculture, Forestry and Fisheries Department Bureau of Marine Industries Marine Industries Promotion Division
  • Masakiyo Yuka
    Graduate school of Core Research, Natural Science Division, Ochanomizu University
  • Shimada Satoshi
    Graduate school of Core Research, Natural Science Division, Ochanomizu University

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Other Title
  • キヌイトアオノリの成熟誘導に及ぼす藻体の断片化および培養温度と塩分条件
  • キヌイトアオノリ ノ セイジュク ユウドウ ニ オヨボス ソウタイ ノ ダンペンカ オヨビ バイヨウ オンド ト エンブン ジョウケン

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Abstract

To induce the maturation of Ulva mediterranea thalli, we examined the effect of sporulation inhibitor elimination and temperature and salinity conditions in culture. In the experiment on sporulation inhibitor elimination, the maturation ratio of dual-layer tissue disks was compared, for which 3-mm-wide disks were punched out from thalli, and single-layer tissue disks were combined into one layer containing two cell sub-layers, forming dual-layer tissue disks. The maturation ratio of the single-layer tissue disks (83.3%) was significantly higher (p < 0.05) than that of the dual-layer tissue disks (16.7%). In the experiment on culture temperature, the maturation ratios of the dual-layer and single-layer tissue disks were compared at 10°C, 15°C, 20°C, 25°C, and 30°C. The temperature range suitable for maturation was 20-25°C, and the optimum temperature was 25°C. Maturation of the single-layer tissue disks progressed rapidly and sharply, compared with the dual-layer tissue disks. In the experiment on culture salinity, the maturation ratio of single-layer tissue disks was compared using 100%, 80%, 60%, 40%, and 20% seawater and distilled water. Maturation occurred in 60%, 80%, and 100% seawater, and the optimum salinity was 100% seawater.

Journal

  • Aquaculture Science

    Aquaculture Science 66 (2), 117-122, 2018

    Japanese Society for Aquaculture Science

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