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Spatial and Temporal Distribution of Skipjack and Relationship with ENSO in the West-central Pacific Ocean

The spatial-temporal distribution of skipjack and relationship with ENSO(El Nino oscillation) was evaluated in the west-central Pacific Ocean(WCPO) as one of the most important fishing area in the world tuna purse seine fishery based on the catch data and fishing times of the tuna purse seine in the WCPO(20°N～25°S,120°E～185°E),and the environment data of sea surface temperature(SST) and Nino 3.4 area SSTA.The results showed that the catch was mainly located in the waters with SST ranging from 28 ℃ to 30 ℃,especially at 29～30 ℃,by a K-S test.The main fishing ground was distributed in the longitude range from E 140°～175°.For different years,the focus fishing area was variable,closely related with ENSO.It was found that there was 1 year time lag with ENSO index in one year as unit in the main center in the longitude and average longitude.