To anticipate the impacts of a historic river restoration, we need to understand how salmon, bats, insects, algae and other parts of the ecosystem are behaving today.

Experts say new international trade restrictions will help, but they leave several problems unsolved.

This year we bid farewell to two lost frogs, the Chinese paddlefish, a plant from New Hampshire, and many others.

A growing movement across the continent is working to remove thousands of barriers and restore some of the world’s most fragmented rivers.

Human activities have imperiled our waterways — along with almost one-third of freshwater fish and many other aquatic species.

Lost in much of the coverage of the region’s water woes is the ecological crisis caused by prolonged drought, climate warming and development.

An upcoming project would change the flow of the Mississippi River and its sediment to make up for land the coast is losing due to climate change and sea-level rise.

Addressing environmental threats in Antarctica could help spur global action, an expert says.

A misguided attempt to control mosquito populations has nearly driven this tiny fish to extinction.

A new book looks at the “dark underbelly of our favorite fish” and urges regulators and businesses to better protect wild salmon, coastal ecosystems and consumers.