In the low-oxygen waters of its natural habitat of Southeast Asia’s shallow marshes, ponds and gentle streams, the betta fish evolved a special organ that allows the fish to gulp surface air to ...

Betta fish are one of the most popular aquarium fish in the world. Here is what to know about bettas, including how long they live.

Betta fish may lose their color while sleeping (it's their natural form of self-defense), and they can sleep in different positions: curled up like a cat, on one side, or even vertically, with the ...

Think about a betta’s natural habitat, and you can see how nature has provided a push for the development of these adaptations in this fish.

In 1975, scientists tried spaying a few hundred female betta fish. We all know what happens to spayed cats and dogs: They become sterile. Betta fish are different. A third of the surviving bettas ...