Development of Reinforced Bottom Gillnets for Mitigation of Damages from Steller Sea Lion Eumetopias jubatus

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  • トド被害防除対策としての強化刺網開発
  • トド ヒガイ ボウジョ タイサク ト シテ ノ キョウカ サシアミ カイハツ

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On the western coast of Hokkaido, bottom gillnets have been damaged due to Steller sea lions (SSL). The destruction of nets and depredation of catches have amounted to more than 1 billion JPY per year since the early 1990s. As mitigation measures, endeavors have been made to develop reinforced bottom gillnets (RBGs). The RBGs are comprised of three layers: a panel of standard netting, sandwiched by a pair of outer nets made of strong fibers. Dyneema, Tetoron and Vectran have been tested as the strengthening fibers. RGBs are required to be operable, catchable, and reasonably priced as well as being defensive against SSL damage. However, none of the three materials completely met these requirements yet. In this paper, the developments of RBG’s in the period of 2001-2006 is reviewed. Of the three fibers tested, Dyneema was concluded to be the most promising, although the price is still too expensive to be acceptable to fishermen.

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