Density and Growth of Ecklonia cava that Appeared Around Artificial Reefs with Seedlings off Usa in Tosa Bay, Japan

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Other Title
  • 土佐湾宇佐地先に設置した種苗付き人工礁の周囲に出現したカジメの密度と生長
  • トサワン ウサ チサキ ニ セッチシタ シュビョウ ツキ ジンコウショウ ノ シュウイ ニ シュツゲンシタ カジメ ノ ミツド ト セイチョウ

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Abstract

In April 2003, seedlings ofEcklonia cava (plant length: 10 cm) were attached to two artificial reefs which had been placed on a breakwater at 4 m depth, off Usa in Tosa Bay, Japan. These transplanted fronds matured in October, and juvenile plants appeared around the reefs in February to March of the following year. Density and size ofE. cavawere measured at the bottom (1, 5, 10 m from the artificial reef) and lateral surface (2.5 and 3.5 m from the reef) of the breakwater by using a quadrat from April 2004 to February 2005. Density of 1, 5, 10 m was 36, 12, 4 ind./m2, respectively and 2.5 and 3.5 m was 104 and 56 ind./m2. Then density gradually decreased to February 2005 but half of the fronds which grew within 5 m from the reef survived. Many fronds ofE. cavamatured in October. In February, plant length and stipe length was 26.3-36.4 cm and 2.8-4.1 cm, and the density of juvenile plants was 32-172 ind./m2on average of quadrats. Thus a small but similar to naturalEckloniabed was formed around the artificial reefs.

Journal

  • Aquaculture Science

    Aquaculture Science 55 (1), 47-53, 2007

    Japanese Society for Aquaculture Science

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