Relationship between sea surface temperature and spatio-temporal distribution of fishing ground of Dosidicus gigas in equatorial and Peruvian waters
Dosidicus gigas is widely distributed in eastern Pacific Ocean.It is an important fishing tar-get for Chinese squid-jigging vessels.The fishing grounds of D.gigas are vulnerable to climate change and marine environment,and the impacts exhibited significant geographical variations.Based on the fisheries data from 2012 to 2018 in southeastern Pacific Ocean as well as sea surface temperature(SST),in this study,we compared and analyzed the difference in the impacts of water temperature on the fishing grounds in equatorial and Peruvian waters.The results showed that the suitable SST range for D.gigas on the fishing ground in equatorial and Peruvian waters has a significant variation.In De-cember,the suitable SST range on the fishing grounds in equatorial and Peruvian waters is from 23 to 24 ℃ and from 20 to 21 ℃,respectively.In January,the suitable SST is 23 ℃ and ranges from 21 to 23 ℃,respectively,in these waters.In February,the suitable SST ranges from 24 to 25 ℃ and from 23 to 24 ℃,respectively,in these waters.In addition,the Nino 3.4 index was positively correlated with SST significantly on the two fishing grounds.However,the variations in SST off Peru lagged with climate variability.Furthermore,the La Nina events play important roles in regulating SST on the fishing ground of D.gigas.During La Nina years,the SST on the fishing ground significantly de-creased in equatorial and Peruvian waters,but the suitable SST range for D.gigas dramatically en-larged,fishing effort at different longitude and latitude clearly increased,and the fishing ground exten-sively distributed and relatively dispersed to the normal climate conditions.
Dosidicus gigassea surface temperaturefishing ground fluctuationLa Nina evente-quatorial and Peruvian water
NETL
NSTL
万方数据
