Mikola Kopanetskyi waded waist high in an outdoor water tank the size of an above-ground pool, slowly creeping up on the beluga sturgeon swimming in front of him. Once he sneaked close enough, ...

Think fish just swim around all day? Think again. The Garra rufa earns its keep nibbling dead skin in spas, while the peacock bass patrols Florida’s waterways as a biological bouncer. From ...

Farms aim to keep beluga on the market despite a U.S. import ban. But scientists say that won’t save the species from going extinct in the wild by 2050 Mikola Kopanetskyi waded waist high in an ...