Original scientific paper

https://doi.org/10.21278/TOF.482057323

Analysis of Trawl Net Fishing of Antarctic Krill in a Polar Ice Area

Zhixin Xiong ; College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, PR China
Xinyuan Wu orcid.org/0000-0001-7069-4253 ; College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, PR China *
Yu Guo orcid.org/0000-0001-7069-4253 ; Marine Design & Research Institute of China, Shanghai, PR China
Ming Ma orcid.org/0009-0000-6853-8665 ; College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, PR China
Zheng Fu ; College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, PR China

* Corresponding author.

Abstract

To analyse the operations of Antarctic krill fishing vessels in regions with polar ice floes, this study used Star-CCM+ software to simulate the effects of towing speed on the height and width of the midwater trawl net of these vessels. The simulation accorded with the experimental results of Su (2017) and was thus shown to be accurate. The fluctuations in the area of the net and the flow passing through it were determined under different L/S ratios (the ratio of the horizontal and vertical distances between the ends of the net gear), ice concentrations, and towing speeds. On the basis of the obtained results, a suitable L/S ratio and towing speed were identified for maximising the fishing efficiency of Antarctic krill fishing vessels. The significant innovation of this article is to link polar ice floes with krill fishing efficiency through net flow. Net flow can more intuitively reflect krill fishing efficiency compared to the net mouth area. Based on the habitat characteristics of Antarctic krill, the conclusion was drawn to choose a trawl with an L/S ratio of 0.55.

Keywords

Antarctic krill fishing ships; model testing; fishing operations; midwater trawl net

Hrčak ID:

315260

URI

https://hrcak.srce.hr/315260

Publication date:

25.2.2024.

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