Cockerel, or Fighting fish (Betta splendens) - Size up to 7 cm.
The male is colored much brighter, has elongated dorsal, anal and caudal fins. The fish got their name because of the natural pugnacity of males, which they use in their homeland, arranging fish fights. Fish of this family have a special organ for breathing atmospheric air, thanks to which the species can live in water with a minimum amount of oxygen. The aquarium for maintenance can be a small, densely planted plant. It is better to keep only one pair in the aquarium, as the males are aggressive, but only to their counterparts.
Fish are unpretentious to feed. Water for maintenance: dH up to 15 ; pH 6.0-7.5; t 22-24 C. During the pre-spawning preparation, it is better to keep males and females separately, to feed abundantly with live food. Breeding water: dH up to 8 ; pH 6.5-7.0; t 26-28 C.
You need a spawning box of 3-5 liters or more with a bunch of plants and a shelter for the female and a small amount of floating plants used by the male to build a nest. The male builds a foam nest on the surface, holding it together with saliva. During spawning, the male and female collect the falling eggs and release them into the nest. After spawning, the female must be removed. Larvae hatch after about a day, after another 3 days the fry begin to swim and take food. At this time, the male is removed from the spawning grounds. It is better to lower the water level.
The female lays 500 eggs. Growing juveniles requires regular water changes. There are many color variations of males - from the most common red and blue to the much less common black and white.
This book gives you a detailed guide on Betta Fish Care