Wild populations of salmon in the Atlantic Ocean continue to face trouble from an unusual source: farmed salmon.
On Monday, the International Union for Conservation of Nature (IUCN) released its first red-list assessment for the freshwater fish category, finding that roughly 20 percent, or one-fifth, of all such species now face the threat of extinction. For many of these fish, long-standing factors such as global heating from climate change, overfishing and pollution continue to contribute to their declining populations.
