岩手県越喜来湾における褐藻ヒジキの多回収穫型養殖

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タイトル別名
  • Multi-harvestable aquaculture of <i>Sargassum fusiforme</i> (Phaeophyta) in Okirai Bay, Northeast Japan
  • イワテケン オキライワン ニ オケル カッソウ ヒジキ ノ タカイ シュウカクガタ ヨウショク

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Both intact thalli of Sargassum fusiforme and those without holdfasts were aquacultured in Okirai Bay, Northeast Japan, to establish them as a multi-harvestable aquaculture resource. Elongated main branches (edible part) of the intact thalli were harvested twice (August 2005 and June 2006) during 1.5 years of aquaculture (November 2004-June 2006). However, two fouling organisms, Laminaria japonica and Mytilus galloprovincialis, also occurred on the aquaculture rope. As a fouling countermeasure, S. fusiforme thalli without holdfasts were aquacultured for 6 months (February-August 2005) with freshwater treatment (biweekly 2-min exposures). Their stipes regenerated holdfasts, and the attached holdfasts elongated around the aquaculture rope; moreover, the new holdfasts gave rise to a number of stipes, which became the bases of new main branches. The elongated main branches were harvested after 4 months of aquaculture. Thalli without holdfasts collected from the rope were aquacultured again for ca. 1 year (October 2005-August 2006) with the same freshwater treatment. After 8 months, elongated main branches were harvested from these thalli with their new regenerated holdfasts. The freshwater treatment was effective to remove L. japonica, but it had no effect on fouling by M. galloprovincialis. Therefore, the two successive harvests were conducted before the mass occurrence of M. galloprovincialis in the summer.

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