Some interesting betta fish facts. Betta fish are small fresh water fish that are part of the Osphronemidae family. Betta fish come in about 65 species too! Aquarium Terrarium, Betta Aquarium, Tropical Fish Aquarium, Freshwater Aquarium Fish, Betta Fish Types, Betta Fish Care, Betta Food, Betta Fish Tattoo, Koi Betta