The Escape Intensity and Its Influencing Factors in Antarctic Krill (Euphausia superba) Passing through Large Mesh at the Front End of a Commercial Trawl

文献类型： 外文期刊

第一作者： Wang, Zhongqiu

作者： Wang, Zhongqiu;Wang, Lumin;Wang, Yongjin;Wang, Zhongqiu;Wang, Lumin;Wang, Yongjin;Tang, Hao;Xu, Liuxiong;Tang, Hao;Xu, Liuxiong;Tang, Hao;Xu, Liuxiong;Tang, Hao;Xu, Liuxiong;Tang, Hao;Xu, Liuxiong

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关键词： trawl; pocket net; liner netting; percent similarity index; diurnal pattern

期刊名称：JOURNAL OF MARINE SCIENCE AND ENGINEERING （ 影响因子：2.9； 五年影响因子：2.9 ）

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年卷期： 2023 年 11 卷 12 期

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收录情况： SCI

摘要： The purpose of this study was to comprehend the escape intensity and its influencing factors in Antarctic krill (Euphausia superba) that escaped through large mesh located at the front end of commercial trawl nets. Two pocket nets were employed to collect escaped krill that passed through the mesh opening in the first section (400 mm mesh size, without liner) and second section (16 mm mesh size liner) of the trawl body. The results show that krill escape primarily took place in the first section of the trawl body. Meanwhile, there was almost no krill escape observed in the second section of the trawl body, primarily attributable to the presence of a 16 mm mesh size liner. In terms of body length composition, the average PSI (percentage similarity index) was 67.31 (95% CI: 61.86-72.87) for krill from the pocket net on the larger mesh part and the codend. In addition, the PSI was significantly different (p < 0.05) between the day (60.96, 95% CI: 55.68-66.71) and night (83.62, 95% CI: 76.80-89.46). The escape intensity of krill ranged from 20.83 to 213.13 g center dot m(-2) per ton per hour in the area at the front end of trawl body, with a mean value of 76.52 (95% CI: 55.22-101.09) g center dot m(-2) per ton per hour during the daytime, and 144.66 (95% CI: 110.44-180.03) g center dot m(-2) per ton per hour at night. These results indicate that krill can see and avoid contacting the netting easily during the day, particularly for larger individuals. This provides insight into the design of krill trawls, specifically on the arrangement of liners, which should be integrated from the front part of the trawl body.

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