In total, there are 350 species of endemic fish and two types of migratory fish. These include: 1) fish found in the warm Kuroshio Current, such as tuna, bonito, yellowtail, Spanish mackerel, sword fish, dolphinfish, and flying fish and 2) fish found in the cold Oyashio Current, such as saury, herring, and salmon. In general, the warm water surface fish arrive from the south, while the colder water fish arrive from the north.ĭolphinfish (Coryphaenidae) consist of two subspecies in Japan: Coryphaena hippurus and C. They originate in the Pacific, are found widely in tropical and sub-tropical seas, and reach approximately 0.5m to 2m in length.
Dolphinfish migrate in groups from May to December and move northward (agari shiira) in waters around Japan during the summer season, moving south (modori shiira) again after late summer.ĭolphinfish are an extremely valuable resource for small-scale fisheries and are popular among recreational fishers in Japan. Both species are often exploited by taking advantage of behaviour aggregates under floating devices (Scientia Marina 1999), behaviour also found in other fish species, especially in their juvenile stage. However, dolphinfish have less value economically than tuna, bonito, and herring in Japan and, as such, are not as frequently caught.
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