長崎県対馬における定置網少量多品種漁獲の有効利用に関する一考察

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  • A consideration of the effective multi-species utilization by set-nets in Tsushima Island, Nagasaki, Japan

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[Author abstract]One major fishery in the coastal area of Japan is the set-net industry, which uses many types of nets, each one designed for migratory species that tend to follow a shore line. The total catch of this fishery is about 678,000 t, which was almost 36% of the total coastal fishery catch (1,901,000t) in 1996. This study was conducted on a set-net operated off the Shikoe area (N34° 26’ 40”E129° 22’ 10”) on the east coast of Tsushima Island, Nagasaki, Japan. The daily catch data indicated that over 20 species had been caught throughout the year. Both the catch composition and the amount of catch varied depending on the season. The methods developed in this area are appropriate in terms of reduction of discard mortality, making optimum use of harvests and reducing post-harvest losses. This report provides one example of how the optimization of this operation method for multi-species fishing has been achieved for an effective utilization of resources.[和文要旨]我が国の沿岸漁業では様々な魚種を対象に定置網が操業されている.本漁業の生産量は678000 トンで,沿岸漁業総生産量1901000 トンの36%を占める(1996 年).本研究では,長崎県対馬東岸の志越漁場における定置網を事例に現地調査を実施した.日別漁獲量・種組成は季節により大きく変動するものの,漁期をとおして20 種以上が漁獲された.当該域における漁獲種の利用方法は,投棄死亡そしてポストハーベスト・ロスを減少させるように機能している.当該域において如何にして資源の合理的な利用がなされているかについての事例を述べる.

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