noun
migratory fish; straddling fish stocks
Refers to fish species that migrate over long distances, such as tuna or salmon. In fisheries management, 'straddling fish stocks' describes populations that move between exclusive economic zones and the high seas.
マグロは代表的な回遊魚です。
Tuna is a typical migratory fish.
回遊魚の保護には国際的な協力が必要だ。
International cooperation is necessary for the protection of straddling fish stocks.
定着魚 refers to sedentary or non-migratory fish that stay in one area, contrasting with 回遊魚.
Compound of 回遊 (kaiyū, 'migration' or 'circuit') and 魚 (gyo, 'fish'). The variant 回游魚 uses 游, which carries a similar meaning of swimming or wandering.