Abstract: Albacore tuna (Thunnus alalung) is one of the main catch fisheries for longline fishery in South Pacific. Based on the data of the catch of the albacore tuna longline fishery in the South Pacific Ocean and sea surface temperature (SST), chlorophyll a concentration (Chl-) and sea surface height anomaly (SSHA) by remote sensing, we analyzed the spatialtemporal distribution of catch per unit of fishing effort (CPUE) of albacore tuna and the relationships of CPUE with marine environmental factors during 2009-2012. The results showed that the fishery was mainly distributed in the sea area (4° S-28° S, 158° E-176° E) and the seasonal change of CPUE was obvious. From January to March, the CPUE value was low (<12.5 ind·1000 hooks^-1), then increased to the maximum (18.1 ind·1000 hooks^-1) in July, but the CPUE value was gradually reduced during August to December. The catch gravity center of albacore tuna in January located in the sea area (16° S, 168° E), then migrated to northwest from February to March. However, the catch gravity center of albacore tuna moved to southeast during March to July, and began to move to northwest after August, while during SeptemberDecember the changes of catch gravity center were relatively small. As a whole, the optimum SST of albacore tuna fishing center ranged from 27.0 to 30.5 ℃ and the second optimum SST ranged from 20 to 24 ℃. The optimum Chla range of this fishery was 0.02-0.08 mg·m^-3 and the SSHA range was 3-23 cm, respectively.

Key words: SWMM, runoff, rainfall, low impact development, regression analysis