Estimation of the fishing efficiency of a mid-water trawl for Pacific saury Cololabis saira using a high-frequency side-scan sonar

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  • NAYA MIYAKO
    Hachinohe Station, Tohoku National Fisheries Research Institute, Fisheries Research Agency
  • UENO YASUHIRO
    Hachinohe Station, Tohoku National Fisheries Research Institute, Fisheries Research Agency
  • MOURI TAKASHI
    Hachinohe Station, Tohoku National Fisheries Research Institute, Fisheries Research Agency
  • OSHIMA KAZUHIRO
    National Research Institute of Far Seas Fisheries, Fisheries Research Agency
  • WATANABE TOSHIHIRO
    National Research Institute of Fisheries Engineering, Fisheries Research Agency
  • FUJITA KAORU
    National Research Institute of Fisheries Engineering, Fisheries Research Agency
  • ITOH KIYOSHI
    Environmental Simulation Laboratory Co. Ltd.
  • IWASAKI KAZUHARU
    Environmental Simulation Laboratory Co. Ltd.
  • MATSUO YASUNARI
    Environmental Simulation Laboratory Co. Ltd.
  • ITOH YUTAKA
    Iwate Fisheries Technology Center
  • SHIMIZU YUICHI
    Iwate Fisheries Technology Center

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Other Title
  • サイドスキャンソナーを用いた中層トロールのサンマに対する採集効率の推定
  • サイド スキャン ソナー オ モチイタ チュウソウ トロール ノ サンマ ニ タイスル サイシュウ コウリツ ノ スイテイ

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Abstract

  In order to improve the accuracy of abundance estimations of Pacific saury Cololabis saira, it is important to raise the fishing efficiency precision of a mid-water trawl (type NST-99, the sampling gear used for stock assessment) for saury. Using a 500 kHz side-scan sonar (SSS), we ensonified surface waters and measured the fish number using image processing methods. Simultaneously, we tried to catch saury in the same waters with the mid-water trawl. We estimated the fishing efficiency of the mid-water trawl as 0.179 (current value used is 0.144) by comparing the number of saury caught by the trawl net per swept-area with the number of saury per swath-area estimated from analysis of SSS records.<br>

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