Volume 16 Issue 5
Oct.  2020
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XU Bo, ZHANG Heng, TANG Fenghua, SUI Xin, ZHANG Yingying, HOU Gang. Relationship between center of gravity and environmental factors of main catches of purse seine fisheries in North Pacific high seas based on GAM[J]. South China Fisheries Science, 2020, 16(5): 60-70. DOI: 10.12131/20200006
Citation: XU Bo, ZHANG Heng, TANG Fenghua, SUI Xin, ZHANG Yingying, HOU Gang. Relationship between center of gravity and environmental factors of main catches of purse seine fisheries in North Pacific high seas based on GAM[J]. South China Fisheries Science, 2020, 16(5): 60-70. DOI: 10.12131/20200006
shu

Relationship between center of gravity and environmental factors of main catches of purse seine fisheries in North Pacific high seas based on GAM

  • 1.

    College of Marine Sciences of Shanghai Ocean University, Shanghai 201306, China

  • 2.

    East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences/Key Laboratory of East China Sea & Oceanic Fishery Resources Exploitation and Utilization, Ministry of Agriculture of and Rural Affairs, Shanghai 200090, China

  • 3.

    College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, China

More Information
  • Received Date: January 10, 2020
  • Revised Date: May 01, 2020
  • Accepted Date: June 03, 2020
  • Available Online: September 27, 2020
    Graphical Abstract
    • Abstract

  • Light seine fishery in North Pacific high seas is a new offshore fishery project in China in recent years. Scomber japonicus, Sardinops sagax, Ommastrephes bartramii and Cololabis saira are the main economic species in that area. It is important to clarify the relationship between the center of gravity and environmental factors for the study on the formation mechanism of fishery and the guidance of fishery production. Based on the 2016−2017 North Pacific Light Seine Fishery catch data and environmental factors such as sea surface temperature (SST) and chlorophyll a (Chl-a), we analyzed the seasonal variation of catch and its relationship with environment were analyzed by generalized additive model (GAM). On the whole, the center of gravity of North Pacific fisheries shifted northeast at the beginning of the fishing flood, and turned southwest during August to late September. The results show that S. japonicas fishing grounds were mainly at 148°E−154°E, 40°N−42°N; S. melanostictus fishing grounds were mainly at 149°E−153°E, 40°N−42°N; O. bartramii fishing grounds were mainly at 150°E−154°E, 40°N−42°N; C. saira fishing grounds were mainly at 150°E−153 °E, 41°N−42°N. Moreover, the optimal SST of S. japonicus CPUE was 13−20.18 ℃, and the optimal Chl-a was 0.1−0.8 mg·m−3. The optimal SST of S. sagax CPUE was 12−19.1 ℃, and the optimal Chl-a was 0.3−0.88 mg·m−3. The optimal SST of O. bartramii CPUE was 14−22 ℃, and the optimal Chl-a was 0.2−1.1 mg·m−3. The optimal SST of C. saira CPUE was 14−21 ℃, and the optimal Chl-a was 0.24−0.98 mg·m−3.

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