Many fish, intended for keeping and breeding in captivity, cannot do without oxygen and a filter. But not all! There are wonderful aquarium fish that do without an aerator. Their name is betta, or cockerels.
The main advantage of these fighting fish is that they can live without oxygen and filter. The fact is that cockerels breathe atmospheric air. Moreover, they do not even like to live in an aquarium equipped with a filter, since such a "dwelling" is oversaturated with oxygen, and the current created by the compressor only scares them. Of course, one should not argue that males can live well in three-liter jars, but the fact that they feel great in a small aquarium without any filtration and aeration is an indisputable fact!
But the breeding of these fish can cause some difficulties, and not every person wants to become a professional breeder. Many people generally keep cockerels to enjoy their beauty. The cockerels are not whimsical in the rest of the service: they feel great in stale water, and also do not have an increased appetite. However, this does not mean that the males need to change the water every six months and feed them once a week. Not!
Betta aquarium fish (or cockerels) are members of the labyrinth family. It is no coincidence that these fish were dubbed "cockerels". The fact is that their color and warlike fighting character resembles beautiful and cocky roosters. For example, if you put two male betta in one aquarium, then a real cockfight can begin with loose fins and tails. If the "fighters" are not separated in time, one of them will die.
In general, cockerels trace their ancestry from Vietnam, Indonesia and Thailand. There they live in warm and small reservoirs with stagnant and silted water. This is why an aerator is not needed to oxygenate a cockerel tank. Males have an oval body, elongated and slightly compressed at the sides. The body length of males reaches 5 cm, and that of females - 4 cm. Dark stripes are located along or across the body of the males. The upper fin is rounded. The lower one starts from the head and reaches the tail itself. The pectoral fins of the cockerels have a regular pointed shape.
It is believed that these fish have no equal in beauty and uniqueness of color. Cockerels dazzle, and their colors shimmer from red to pink, from pink to yellow, from yellow to orange, from orange to green, taking on all sorts of shades. A particularly bright color can be observed in males arranging a "cockfight". It is interesting to observe the fish even when they inflate their gills in an excited state, forming a kind of bulging "collar" around their head.