Restoration and Maintenance Technology for Fishing Ground Environment

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  • 漁場環境の修復修繕技術について
  • ギョジョウ カンキョウ ノ シュウフク シュウゼン ギジュツ ニ ツイテ

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Various environmental changes including the increase of large-sized jellyfish and the expansion of muddy area have recently been occurring in Wakasa Bay and simultaneously fish catches and production values have been reducing. Towards these environmental changes, various technologies have been developed to maintain and restore the fishing ground environment Applying the respective technology in simple manner is not sufficient for effective expansion of these techniques but it is necessary to fully consider the restoration goals and methods from the perspectives of fishery production, proper nutrient concentrations, securing shallow bottom (tidal flats and seaweed beds) and the amount of bottom dissolved oxygen. This paper illustrates the cases of ocean fertilization technologies for the purpose of increasing the fishery production, biological habitat improvement technologies, and improvement technologies to improve the bottom mud quality. These were cited from ones have been so far studied and conducted regarding restoration technology of the fishery environment Furthermore examples of creating mechanisms to promote restoration of the fishing ground environment at regional scale were introduced and the possibilities and problems in the case of applying them to Wakasa Bay were summarized.

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