"The Main Salmon River was called "The River of No Return" back in the early days when boats could navigate down the river, but could not get back up through the fast water and numerous rapids. The romantic name lives on today, even though jet boats can navigate upstream."
http://www.fs.usda.gov/detail/scnf/home/?cid=stelprdb5360033
That is Idaho's Salmon River
Length - 425 miles Source - Sawtooth Range Mouth - Snake River Major tributaries - Yankee Fork, Panther Creek, Little Salmon River, East Fork Salmon River, Pahsimeroi River, Lemhi River, North Fork Salmon River.
Missouri, Mississippi, Salmon (river of no return)
Salmon return to their birthplace after they mature because of a strong instinctual drive called homing behavior. This behavior helps them navigate back to the same river or stream where they were born to spawn and ensure the survival of their offspring.
The "River of No Return" is the nickname of a branch of the Salmon River in central Idaho. The river is famous for its strong rapids. The Lewis and Clark Expedition of 1805 was told that if they made it down this river, they would never be able to make it back upstream against the current. Without a motorboat, this still holds true today.
A group of salmon is called a run when they swim together up a river to spawn.
It's instinctual. They go to where the water is warm to mate and lay their eggs
Some common sealife found in the River Rhine include eels, trout, perch, pike, and carp. In recent years, efforts to improve water quality in the river have led to the return of species such as salmon and sturgeon. Additionally, various mollusks, crustaceans, and smaller fish species can also be found in the river.
The spawning area of salmon is called a "spawning ground" or "spawning bed," where female salmon lay their eggs and male salmon fertilize them. These areas are usually located in freshwater rivers or streams where salmon return to reproduce.
Salmon is a type of fish that can live in both rivers and seas. They are born in rivers, migrate to the sea to grow, and then return to rivers to spawn.
Farmed salmon can tranmet diseases to wild stocks of salmon. If farmed salmon enters the rivers to spawn and interbreeds with wild samon they can contribute to what can be called 'genetical pollution'. As each stock of salmon in each particular salmon river has been adapted to the very conditions in this river, generation after generation, for thousands of years, such an interference is undesirable.
There are a variety of fish that live in the Columbia river including salmon and chinook. Coho, steelhead, and sockeye are also found in this river.