Volume 17 Issue 4
Aug.  2021
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LI Jie, ZHANG Peng, WANG Teng, YAN Lei, YANG Bingzhong, CHEN Zuozhi. A study on settlement performance of falling-net based on GAM[J]. South China Fisheries Science, 2021, 17(4): 74-81. DOI: 10.12131/20210070
Citation: LI Jie, ZHANG Peng, WANG Teng, YAN Lei, YANG Bingzhong, CHEN Zuozhi. A study on settlement performance of falling-net based on GAM[J]. South China Fisheries Science, 2021, 17(4): 74-81. DOI: 10.12131/20210070
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A study on settlement performance of falling-net based on GAM

  • South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences/Key Laboratory of Open-Sea Fishery Development, Ministry of Agriculture and Rural Affairs, Guangzhou 510300, China

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  • Received Date: February 28, 2021
  • Revised Date: April 08, 2021
  • Accepted Date: April 19, 2021
  • Available Online: April 22, 2021
    Graphical Abstract
    • Abstract
  • In order to comprehensively understand the settlement performance of falling-net, as well as to provide references for the development of falling-net model test and improvement of fishing gear and method, we conducted sea trials in the central-southern South China Sea in March 2016, and studied the settlement performance of falling-net based on polynomial regression and Generalized Additive Model (GAM). The results show that: 1) Free settlement was a more critical factor affecting the total settlement depth. 2) 90.0–119.9 s was an appropriate free settlement time based on the settlement performance of the falling-net. 3) The free settlement speed first increased in a short time and then decreased, the maximum value occurring at 10th s. The damping settlement speed remained relatively stable in the first 50 s with little change, but then decreased rapidly. 4) Free settlement time (Tf), wind speed (Sw), and direction angle between wind and current (α) had significant influences on free settlement depth. Tf, Sw, drift speed of fishing boat (Sb) and α had significant influences on damping settlement depth. The study suggests that: 1) The influences of Sw and α on free settlement depth and damping settlement depth are complex and non-linear, and may affect the settlement of falling-net through waves and changing the relative position between fishing boat and falling-net. 2) Sb has a significant influence on damping settlement depth. This may be caused by the fact that Sb affects the degree of closure of net-mouth and hauling of purse line.
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