精选优质文档-倾情为你奉上水产养殖专业英语Ocean Today一Open Rivers, Abundant FishMany species of fish, including those that are important to the U.S. economy, migrate from the ocean to freshwater rivers and streams to spawn. After spending years in the ocean, fish instinctually return to the same rivers where they were born, making the often-treacherous journey upstream. Some fish, like salmon, travel nearly a thousand miles.If they make it past strong river currents and hungry predators, these dete
