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>

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  • WATANABE TOSHIHIRO
    Fishing Technology Division, National Research Institute of Fisheries Engineering, Fisheries Research Agency

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  • Strategies for further development of aquatic feeds
  • 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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Abstract

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.

Journal

  • Fisheries science

    Fisheries science 68 (sup1), 101-104, 2002

    The Japanese Society of Fisheries Science

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