静岡県榛南海域へ移植したカジメ・サガラメ種苗の生長・成熟とアイゴによる食害

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タイトル別名
  • Growth and Maturation of Ecklonia cava and Eisenia arborea Seedlings Transplanted along The Coast of Hainan, Shizuoka Prefecture and The grazing Caused by Herbivorous Fish Siganus fuscescens
  • シズオカケン ハイナン カイイキ エ イショクシタ カジメ サガラメ シュビョウ ノ セイチョウ セイジュク ト アイゴ ニ ヨル ショクガイ

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A vast deforested area of approximately 8, 000 ha exists around the coast of Hainan, Shizuoka. Here we transplanted seedlings of kelpsEcklonia cavaandEisenia ayboreawere transplanted into St. 1 (ca 5m in depth) and St.2 (ca 8m in depth) in this area; we also investigated the growth and the maturation of these seedlings, and the grazing by the herbivorous fishSiganus fuscescensfrom July 2005 to February 2006. The blade length ofE. cavain St. 1 was ca 50cm in July 2005. The minimum blade length (ca 20cm) was observed from September to October 2005, and the length began to increase subsequently. During the investigation, seasonal changes in theE. cavablade length in St. 2 were similar to those observed for St. 1, and the blade length of St. 2 was always lesser than that of St.1. MatureE. cavasporophytes were observed from September 2005 to February 2006 and approximately half number of the sporophytes were matured by November 2005. Juvenile sporophytes derived from transplantedE, cavawere observed around the concrete blocks in February 2006. The grazing byS. fuscescenswas observed from August 2005 to February 2006 in both the species. Particularly, theE. ayboreasporophytes transplanted in St. 1 underwent serious grazing damage as compared to theE. cavasporophytes. The blade length ofE. ayboreawas below 10cm, and a major part of blade was grazed during the period from September 2005 to February 2006. Therefore, no juvenileE. ayboreasporophytes were observed there.

収録刊行物

  • 水産増殖

    水産増殖 55 (4), 541-546, 2007

    日本水産増殖学会

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