This article originally published at California's love for one flower is poisoning the state's last wild river.

A researcher measures a dead coho found in Seattle’s Longfellow Creek in 2014. More than a decade ago, researchers began noticing that adult coho were dying before returning to spawn in urban creeks ...

HEALDSBURG, Calif. (KGO) -- The drought is doing double damage to the state's salmon population. The lack of water is not only hindering spawning, it's threatening the fish who actually made it up ...

California's northern temperate coastline is a beautiful and bracing geography full of peaceful natural landscapes. This ...

"It has been an amazing opportunity." Researchers share video of fascinating discoveries in crucial US waterway: 'We were ...

An endangered species is making a “surprisingly strong” return to a Bay Area creek. The latest count of coho redds (or nests) is over 70 in Olema Creek, about 3 miles southeast of Point Reyes National ...

Coho salmon spawning on the Salmon River in northwest Oregon (BLM photo) For the first time in 60 years threatened coho salmon have returned to the Upper Klamath River Basin, the California Department ...

A single severely dry winter temporarily, but dramatically, altered the ranges of three fishes — Chinook salmon, coho salmon, and steelhead trout — in California’s northern waterways. In a new study, ...

Hundreds of thousands of fish have died in California's Klamath River from suspected gas bubble disease, a condition caused by a change in water pressure. The California Department of Fish and ...