Factors influencing the trawling status of Antarctic krill fishery based on multivariate analysis
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  • CHEN Mingxin

    CHEN Mingxin

    College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
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  • XU Liuxiong

    XU Liuxiong

    College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;Key Laboratory of Oceanic Fisheries Exploration, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China;National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China;Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China;Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China
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  • TANG Hao

    TANG Hao

    College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;Key Laboratory of Oceanic Fisheries Exploration, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China;National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China;Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China;Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China
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  • ZHOU Cheng

    ZHOU Cheng

    College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;Key Laboratory of Oceanic Fisheries Exploration, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China;National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China;Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China;Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China
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Clc Number:

S972.13

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    Abstract:

    The net position, net body status and overall status of trawl are important indices to evaluate the trawling performance during trawling operation. The trawl operation status of an Antarctic krill trawl is expressed by the depth difference between the different parts of the trawl (headline, section 3-4 net body connection, upper midpoint of the cod-end mouth). In order to determine the trawling status of midwater trawl,the effects of fishing operations, marine environment and catch on the status of trawling operations were investigated in this study. The results showed that:The depth difference between the headline and the section 3-4 net body connection range from -0.20 to 8.02 m, and the depth difference between the headline and the upper midpoint of the cod-end mouth ranged from 6.49 to 30.16 m; Warp length, towing speed, wind speed and water velocity at 150 m depth had significant effects on the depth of the headline (P<0.05); The headline depth was positively correlated with the warp length and water velocity at 150 m depth, there was a negative correlation between the headline depth and towing speed, and the headline depth decreased first and then increased with the increase of wind speed; Towing speed, water velocity at 200 m depth and wave height had significant effects on the depth difference between the headline and the section 3-4 net body connection(P<0.05), The depth difference between the headline and the section 3-4 net body connection increased first and then decreased with the towing speed and water velocity at 200 m, When the towing speed was 2.6 kn and the water velocity at 200 m was 0.3 kn, the depth difference between the headline and the section 3-4 net body connection was the largest, and the depth difference was the smallest when the wave height was 2 m; The catch was positively correlated with the depth difference between the headline and upper midpoint of the cod-end mouth; Warp length was the most important factor affecting the status of trawling operations, followed by towing speed, wind speed, wave height, and water flow velocity.

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Get Citation

陈明鑫,许柳雄,唐浩,周成.基于多元变量的南极磷虾拖网作业状态影响因素分析[J].上海海洋大学学报,2021,30(1):144-154.
CHEN Mingxin, XU Liuxiong, TANG Hao, ZHOU Cheng. Factors influencing the trawling status of Antarctic krill fishery based on multivariate analysis[J]. Journal of Shanghai Ocean University,2021,30(1):144-154.

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History
  • Received:December 16,2019
  • Revised:March 23,2020
  • Adopted:April 08,2020
  • Online: January 22,2021
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