Spatial Distribution of Fishing Ground of Jumbo Flying Squid Dosidicus gigas in the Equator in Eastern Pacific Ocean
FANG Xingnan1, YU Wei1,2,3,4, CHEN Xinjun1,2,3,4
1. College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China; 2. National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, China; 3. Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China; 4. Key Laboratory of Oceanic Fisheries Exploration, Ministry of Agriculture and Rural Affairs, Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China
Abstract：The spatial and temporal changes in the gravity centers of the fishing ground of jumbo flying squid Dosidicus gigas were investigated according to the fishing data of jumbo flying squid and the sea surface temperature (SST) and chlorophyll a concentration (Chl-a) in the equatorial waters in the Eastern Pacific Ocean in different months from January to July in 2017 by the longitudinal and latitudinal gravity centers of the fishing ground method. The effects of SST and Chl-a on catch per unit effort (CPUE) were evaluated by generalized additive model (GAM), and the suitable range of SST and Chl-a and monthly changes were determined for jumbo flying squid based on the relationship between fishing effort and SST as well as Chl-a concentration. The results showed that the gravity centers of the fishing ground gradually were shifted southeastward from January to July. GAM results indicated that there was significant effects of the two environmental factors on CPUE (P<0.05). The suitable SST ranges were initially increased and then decreased with the month, with the maximal suitable SST ranging from 26.8 to 27.2 ℃ in April. The optimal Chl-a concentration range was basically the same in the first five months, ranging from 0.14 to 0.16 mg/m3, 0.16—0.18 mg/m3 in June and 0.18—0.20 mg/m3 in July. The fishing ground of jumbo flying squid in the equator was a new fishing ground which was exploited by Chinese squid fisheries in recent years. These findings led to understand spatial distribution of jumbo flying squid in this region, which provided scientific basis to look for fishing grounds with high squid abundance.
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2022, Vol. 41 
