This species, with its many varieties, is the most common betta fish found in aquariums and pet stores, ... Female betta fish prefer red males to blue ones. — Behavioral Ecology.

Male vs. Female Betta Fish: Beard and Flaring. While both male and female bettas have a membrane below their gill plate that appears like a “beard,” the male has a larger beard.

And betta fish, he adds, seem like an “extreme case” of sex determination changing within a species. In our bid to breed more beautiful and fiercer fish, we might have given them a sex gene too.

A 5-gallon tank is ideal for most betta fish, and they should never share their tank with another betta fish. The males of the species will fight one another, and not all female betta fish get ...

Female Betta – As colorful as GloFish® male bettas, females are less aggressive than their male counterparts and can be kept with other female bettas, GloFish® Tetras, Barbs, Danios and Sharks ...