run

noun

Fish: Seasonal migration undertaken by fish, usually as part of their life history, e.g., spawning run of gemfish; upstream migration of whitebait. Fishers may refer to increased catches as a `run' of fish, a usage often independent of their migratory behavior. Also used for transitional segments of streams, between a riffle and a pool, with moderate current and depth; for the direction in which netting is braided or for the regular movement of vessels between ports.