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Experimental study on the motion of a flexible hose net used for fish-harvesting in a set-net fishery

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Abstract

In a set-net fishery, a leader net and the related nets guide migratory fish into a box chamber net. Many workers have to visit the set-net and haul the box chamber net for harvesting almost every day, while the net-hauling operation in the early morning is dangerous. An automated net-hauling system using a flexible hose net has been proposed as a manpower-saving measure in such operation. The hose net comprises the brick forms of flexible hoses and is installed on the water bottom below the box chamber net. Compressed air is injected from one edge of the hose net to haul the box chamber net gradually, resulting in cornering fish in the other edge. The purpose of the present study is to observe the motion of the hose net and to analyze its formation in water current. Water tank testing was carried out using a 1/100 scale model of a set-net and a hose net. As a result, the middle part of the hose net was steep enough to corner fish in the end of the box chamber net. The two-dimensional formation of the hose net could be approximated by a catenary curve, while a part of the hose net including air inside was likely to have stiffness. The stiffness of the hose including air inside should be taken into account in the following water tank testing. The experimental results will provide the benchmark for the validation of the numerical model, which will be developed in the future. In addition, numerical analysis as well as water tank testing will reveal the tension on the hose net and mooring ropes for the basic design of the hose net in the future. For realizing the prototype of the hose net, special care should be taken for the explosion of air with decreasing pressure in the floating operation and for the leakage of air through the pinholes, which may be generated by sudden change in water pressure on the flexible hoses and their connectors.

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Acknowledgements

A part of the present study was supported by the Ministry of Education, Science, Sports and Culture through a Grant-in-Aid for Young Scientists (B) (Research Project Number: 23760777) and a Grant-in-Aid for Scientific Research (B), (Research Project Number: 25289313); further funding was provided by the special fund of the Institute of Industrial Science, University of Tokyo. The authors are indebted to Mr. M. Fujino and Mr. H. Itakura at the Institute of Industrial Science, University of Tokyo. We would like to thank Ajirogyogyou Co. Ltd. for providing us the information of the set-net and the field.

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Authors and Affiliations

  1. Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo-to, 1538505, Japan

    Daisuke Kitazawa & Yoichi Mizukami

  2. College of Marine Science, Shanghai Ocean University, 999 Hucheng Ring Road, Lingang New City, Shanghai, 201306, China

    Junbo Zhang

  3. NITTO SEIMO CO., LTD, 2-20-15-701 Shinbashi, Minato-ku, Tokyo-to, 1050004, Japan

    Yoshio Hirai & Takashi Hosokawa

Authors
  1. Daisuke Kitazawa
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  2. Junbo Zhang
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  3. Yoichi Mizukami
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  4. Yoshio Hirai
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  5. Takashi Hosokawa
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Corresponding authors

Correspondence to Daisuke Kitazawa or Junbo Zhang.

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Kitazawa, D., Zhang, J., Mizukami, Y. et al. Experimental study on the motion of a flexible hose net used for fish-harvesting in a set-net fishery. J Mar Sci Technol 23, 620–632 (2018). https://doi.org/10.1007/s00773-017-0498-y

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  • DOI: https://doi.org/10.1007/s00773-017-0498-y

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