When the drug clobazam accumulates in Atlantic salmon's brains, migrating juvenile fish reach the ocean sooner, a new study found. A juvenile salmon is shown in May 2019. - Jörgen Wiklund Hatched in ...

Increased flows are expected to begin on Oct. 16, and officials say the salmon are vital to the region's ecological health.

One of the enduring ichthyological mysteries is how migratory fish know when it is time to move from their winter to summer ...

Rising water temperatures in the Columbia River Basin are raising questions about whether fishery managers must take new steps to save the imperiled fish. A persistent heat wave gripping parts of ...

Just a year after four dams were removed, fall Chinook have migrated nearly 300 miles into the Upper Klamath Basin in ...

Chinook salmon on the Klamath River made it all the way to the river's headwaters in southern Oregon some 300 miles from the ...

Every summer, many rivers across Alaska appear as if they have caught fire. The water turns a deep, almost impossible red as ...

Typically, rainfall helps trigger salmon to move upstream, but this year's dry conditions have delayed activity in some waterways.

(CNN) — Hatched in quiet streams and rivers, salmon undertake a perilous journey to reach the open ocean where they become mature adults. Over millions of years, generations of young salmon have ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Hatched in quiet ...