The northern snakehead is not alone in this ability: Walking catfishes, lungfishes, and betta fish can all breathe air directly as well. These fish reach sexual maturity between one and three ...

Betta fish—also known as Siamese fighting fish ... Because their usual habitats are extremely low in oxygen, bettas have evolved to breathe air at the water’s surface. This ability develops ...

Take fish, for example. Unlike land animals, fish get their oxygen from water, not air. They don’t have lungs to breathe with either, they have gills. Fish gulp water through their mouths and ...

Sea snakes are reptiles, not fish, and although they have adaptations which help them swim in the water, they still require air to breath unlike all known species of fish. The snakehead fish has a ...

Louisiana’s ecosystem faces a new threat—the aggressive Northern Snakehead fish. If you catch one, don’t release it! Here’s ...

"We found that the breathing rates of the individual fish vary," says Dr. Judit Vas, a behavioral biologist at NMBU. "Some of them breathe more slowly or faster than others. The newly developed ...

A record bowfin was caught on a NJ creek on a warm day last month. Bowfin are living fossils as they're last survivor of a primitive family of fish.