Pandemic setbacks have sparked a resurgence of invasive sea lampreys in the Great Lakes, putting fish stocks at risk.

A brain teaser that has been gaining significant traction on X asks puzzle enthusiasts to figure out the number of fish left inside a tank. The puzzle provides the number of fish that have drowned ...

A "significant number" of dead fish have been found in a waterway in Boston, the Environment Agency has said. The agency found low oxygen levels and ammonia in the Maud Foster drain. Several fish ...

With no population figures available, estimates of the decline are based on the fall in the number of fish caught. Some experts think there may be only a few hundred, or even fewer, adults left in ...