noun
seasonal migration
Primarily used in biology and fisheries to describe the seasonal movement of fish, marine mammals, or other animals.
サケは産卵のために季節回遊を行う。
Salmon undertake seasonal migration to spawn.
回遊 is a broader term for migration or roaming, while 季節回遊 specifically refers to migration tied to seasons.
Compound of 季節 (season) and 回遊 (migration, roaming).