マコンブ漁場における水中バックホウを用いた雑海藻除去

概要

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Various techniques, for example, swinging chains, jet of compression air, and underwater bulldozer etc., were introduced to remove needless seaweeds as a countermeasure of barren grand. These removal effects, however, were not yet reported so much. Then, improving the occasion when fishermen's cooperative association removed needless seaweeds using underwater backhoe in waste Laminariajaponica beds off the Ohma-cho, Aomori prefecture, we made investigations into effects of seaweeds removal from December 1999 to June 2003. As a result, the good insertions and growths of Laminaria japonica were observed in every surveyed areas after removing seaweeds. But, with the lapse of time needless seaweeds began inserting again and their intermixture rates were about 17.0% in wet weight in the removal ranges from 30 to 42 months. It is suggested that the durations of removal effects are estimated to be approximately 3 years.
2006-02-20