Dolphinfish (Coryphaena hippurus) are an abundant, wide-ranging, epipelagic predatory fish found in tropical, subtropical and temperate waters warmer than 20°C. The species is highly migratory, and is caught by many coastal countries throughout its range. In the western Pacific Ocean, dolphinfish are distributed from New Zealand in the south to Japan in the north, and are especially abundant in the Kuroshio Current off Japan and Taiwan. The resource supports important coastal and offshore fisheries off Taiwan. The catch of dolphinfish varies throughout the year in the three major Taiwanese fishing ports on the northern, eastern and southern coasts, with a large seasonal peak in April–June (spring) and a smaller peak in September–November (autumn). This study will useing advanced electronic tagging (TDR, pop-up satellite archival tags (PSATs) record investigating behaviour and population movement of dolphinfish. The data obtained will be an important scientific basis for future stock assessment and management of this fishery.