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In-situ dynamics of tuna purse seine deployment in various operations and currents

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  • Fisheries
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Abstract

One of the greatest concerns for a successful catch in tuna fishing operations is the diving behavior of the purse seine. To analyze the integrated effect of fishing methods and sea currents on purse seine sinking depth, a multiple regression model was used. This improved model shows current speeds, shooting duration, the included angle between a two-layer current, and net mouth orientation relative to current direction (shooting angle) have an influence on maximum sinking depth. The current in the mid-layer is considered to significantly resist the seine’s vertical dive by a quadratic relation, but an increased shooting duration and shooting angle can be enhance the sinking. An obvious difference in terms of sinking depth is found between free-swimming school fishing and floating objects fishing, two common methods in tuna purse seine fisheries. It has been suggested that seine sinking dynamics respond to gear manipulation and, therefore, the model provides useful guidance in implementing net casting for an effective capture.

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Acknowledgements

This study was supported financially by the National High Technology Research and Development Program of China (No. 2012AA092302); the Project of First-Class Disciplines, Shanghai Universities: Eco-Friendly Fishing Gear and Fishing Methods in the Field of Fisheries Science (B-5005-12-0001-4C), and the special funding for the development of science and technology of Shanghai Ocean university (No. a2020914200060).

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Authors and Affiliations

  1. College of Marine Sciences, Shanghai Ocean University, 999 Huchenghuan Road, Lingang New District, Shanghai, 201306, People’s Republic of China

    Cheng Zhou, Liuxiong Xu, Hao Tang & Xuefang Wang

  2. Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University, Shanghai, 201306, People’s Republic of China

    Liuxiong Xu & Xuefang Wang

  3. National Engineering Research Center for Oceanic Fisheries, Shanghai, 201306, People’s Republic of China

    Liuxiong Xu & Xuefang Wang

  4. Shanghai Collaborative Innovation Center for Oceanic Fisheries, Shanghai, 201306, People’s Republic of China

    Liuxiong Xu & Xuefang Wang

Authors
  1. Cheng Zhou
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  2. Liuxiong Xu
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  3. Hao Tang
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  4. Xuefang Wang
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Correspondence to Liuxiong Xu.

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Zhou, C., Xu, L., Tang, H. et al. In-situ dynamics of tuna purse seine deployment in various operations and currents. Fish Sci 81, 1003–1011 (2015). https://doi.org/10.1007/s12562-015-0918-z

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  • DOI: https://doi.org/10.1007/s12562-015-0918-z

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