Strategies for further development of aquatic feeds

DOI DOI Web Site Web Site Web Site 被引用文献19件 参考文献64件 オープンアクセス
  • WATANABE TOSHIHIRO
    Fishing Technology Division, National Research Institute of Fisheries Engineering, Fisheries Research Agency

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タイトル別名
  • Development of the deep-sea video monitoring system on a towed sledge to estimate the population density of the snow crab <i>chionoecetes opilio</i>
  • Development of the deep-sea video monitoring system on a towed sledge to estimate the Population density of the snow crab Chionoecetes opilio

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説明

The sock abundance of the snow crab Chionoecetes opilio has been estimated based on trawl and pot surveys in Japan. However, the gear efficiency has not been sufficiently measured. As a direct observation method to estimate the population density of the snow crab, the Deep-sea Video Monitoring System on a Towed Sledge (DVMSTS) was developed and its effectiveness was demonstrated in field observations. To improve the accuracy of the crab population density estimated from the amount of crab catches obtained by the survey pot, the Effective Fishing Area Per Survey Pot (EFAPSP) was estimated using the DVMSTS. The observations by DVMSTS and pots fishing operations were performed 18 times in total off the Oki Islands in the Sea of Japan in April to May, 2000. The EFAPSP was estimated to be approximately 1, 600m2/pot. The DVMSTS can be utilized for not only estimation of the population density but also calibration of the gear efficiency for the snow crab.

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