Preliminary experiment to estimate the effective area fished per commercial trap for red queen crab [Chionoecetes japonicus] using a deep-sea video monitoring system on a towed sledge
2004
Watanabe, T. (Fisheries Research Agency, Yokohama (Japan)) | Maeda, T. | Yosho, I. | Shirai, S.
Abstract: The relative level of stock abundance for the red queen crab Chionoecetes japonicus has been estimated based primarily on fishing reports which fishermen are obliged to address. To ensure long-term sustainable use of this resource, it is necessary to promote a better management strategy based on its stock abundance. To investigate the crab stock abundance estimate derived from the fishing effort obtained from the fishing reports, the effective fishing area per commercial trap was estimated using a deep-sea video monitoring system on a towed sledge. The observations by this system and trap fishing operations were performed in Yamato-tai (bank) in the Sea of Japan in August, 2002. The effective fishing area per commercial trap was estimated to be between 400 square m/ trap and 6,500 square m/ trap and greatly fluctuated. It is necessary for this experiment to perform in the sea area where legal male crabs (carapace width > 9 cm) occur more abundant.
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