A clever tropical fish has flipped how biologists are thinking about memory, brains and visual recognition in the animal ...

When oxygen disappears, most fish suffocate. This one ferments its own metabolism and waits months for spring beneath frozen ...

LAS VEGAS (AP) — Federal protections could soon be extended to a rare Nevada fish that environmentalists say is “barely clinging to existence” because of rapid groundwater pumping in a remote region ...

Scientists don't know much about the rare bumblebee catfish, native to the rivers of Brazil. One research team was lucky enough to observe thousands of them climbing to scale a waterfall, probably to ...

Most assume that cold water is deadly for fish. The truth is, nature has incredible exceptions. In polar oceans and snowy ...