Learn about the evolutionary ease of cichlid fishes, which transition from simple to complex teeth (and vice-versa) faster ...

It’s not what you do, it’s how readily you do it. Rapid evolutionary change might have more to do with how easily a key ...

Experienced aquarium owners know they should research different fish species before putting them in their tanks. Some fish ...

The cichlid fish of Africa's Great Lakes have formed new species more rapidly than any other group of vertebrates. A new study shows that the ease with which these fish can develop a biological ...

There is some anecdotal evidence indicating that fish do recognize individual humans, but this evidence comes exclusively ...

Flowerhorn cichlid. Image by Lerdsuwa, CC BY-SA 3.0 , via Wikimedia Commons. Two Devils Hole pupfish. Image by Olin Feuerbacher : USFWS, Public domain, via Wikimedia Commons. The Devil’s Hole pupfish ...

Fish will bully each other for many reasons, but it usually occurs due to territorial disputes or competition at breeding ...

Wainwright's lab studies the evolution and diversity of fish. The cichlid fishes of Africa's great lakes are a particularly large and diverse group, adapted to a wide variety of habitats and food ...

A rare species of fish, the boxer pupfish, which has not been observed in its natural habitat in Lake Chichancanab in Mexico ...

No, you can't cuddle them, but these fish sure are adorable. Here's what to know before adding them to your tank.