長崎県下で広く認められたヒジキの生育阻害の原因

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タイトル別名
  • Growth Inhibiting Factors for Edible Brown Alga, Sargassum fusiforme, along Coast of Nagasaki Prefecture, Northwestern Kyushu, Japan.
  • ナガサキ ケンカ デ ヒロク ミトメラレタ ヒジキ ノ セイイク ソガイ ノ ゲンイン

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We conducted field surveys from 1998 to 2001 at 20 sites by setting net cages made of stainless steel wire on Sargassum fusiforme bed to protect the thalli from fish grazing. In October or November, the thalli were 2 to 17 cm long inside the cages and 0.3 to 2 cm long outside, demonstrating a clear difference in length. When the cages were removed at four sites in December, the growth of thalli was inhibited in three sites. After February, setting of cages at nine sites showed no effect on the growth. These results suggest that setting of the cages prevented thalli from grazing by herbivorous fish. Active fish grazing is thought to be prevailed from summer to autumn and decreasing from winter to spring for S. fusiforme bed along the coast of Nagasaki Prefecture. Differences in duration and intensity of grazing might cause various conditions of inhibited growth.

収録刊行物

  • 水産増殖

    水産増殖 50 (3), 295-300, 2002

    日本水産増殖学会

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