When choosing future residents for their home water reservoir, many owners are concerned about the question of which fish live without air in the aquarium. In fact, fish, like all living things on the planet, need oxygen, which can be atmospheric or diluted in the water column. With regard to air in the aquarium environment, that is, phenotypes that can do without it.
Two-headed fish species
Usually fish breathe with the help of gill slits, placed on the side in the amount of 4–5 pairs. The fluid passes through the gills, supplying oxygen, and taking CO2. However, there are varieties of fish that can breathe not only oxygen from aquarium water, but also atmospheric air.
The most prominent representatives of the two-breaths are the Multoper family, for example, polypterus and mnogoper. They have a rare addition of a bubble, so these fish do not need dissolved oxygen, they inhale the air, swimming to the surface.
Other representatives of the fish kingdom who do not need oxygen in the water are the Macropod family. These are lyalius, all types of gourami, Betta Fish, and fighting stitches. The peculiarity of these fish is the labyrinth organ of respiration, due to which they can breathe atmospheric oxygen, so they are often placed in an aquarium without a filter and compressor.
In addition to the types listed above, there are individual representatives of other phenotypes that live and breathe air from the atmosphere that is collected in the intestines. These are the catfish corridor, which often go up to get air.
Having learned what fish can live without oxygen, beginner aquarists often make a fatal mistake, blocking residents from admitting to air masses. This is wrong, because even in the presence of a swim bladder or labyrinth organ, the installation of a compressor or aerator is still required in the tank, especially when overpopulating fish in an aquarium. Despite the ability to breathe atmospheric air, phenotypes in the absence of aeration can be poisoned by carbon dioxide.
Filtration and aeration in the pond
Aquarium fish that can be kept in a tank without aeration should have a labyrinth organ or swim bladder. In this case, the surface of the water is freed from floating plants, and the lid of the reservoir is removed so that the inhabitants can always inhale fresh air.
With regard to the installation of the filter, the labyrinth species can do without it, but representatives with a swim bladder, such as catfish, loaches, and eels, belong to fish whose content requires filtration. Especially it concerns those tanks where many copies of this look live.
For aquarium without aeration and filtration, special care is required, consisting of the following points:
- the right choice of phenotypes according to their conditions of detention and requirements;
- constant tank cleaning;
- regular water renewal every three days;
- control of the population in the reservoir;
- care for the aquarium flora, and removal of overgrown bushes;
- health surveillance underwater inhabitants.
Lack of air in the aquarium
Having learned which fish can be kept without an aerator, many aquarists do not care about measuring oxygen and carbon dioxide, which ultimately leads to the death of pets. The reasons for the lack of air in the water are:
- overpopulation of the tank;
- high salt levels;
- consequences of improper treatment;
- sharp drops of alkalinity parameters.
The lack of air in polluted aquariums is especially dangerous, especially if it is small tanks. In such bodies of water, oxidation processes begin to occur, which have a detrimental effect on the inhabitants. Also in aquariums, harmful bacteria and algae are activated. Ecological balance returns, stabilizing the level of oxygen in the water.
The absence of an aerator and compressor leads to the following consequences:
- fish swim up to the water;
- phenotypes bulging gills, trying to eat less;
- immunity decreases;
- fish die.
How to fill the lack of oxygen
Very often, lack of oxygen arises due to the treatment of phenotypes. When drugs and drugs are introduced into the fluid from an infection, the water temperature rises and the amount of air decreases. In this case, professionals advise novice aquarists to install an aerator and filter in the tank in order to compensate for the lack of air. They will not only fill the water with oxygen, but also stabilize carbon dioxide, clean the aquarium from impurities, organic matter and harmful substances.
The second way to eliminate the lack of oxygen. planting live vegetation. As many aquarists know, living mosses and ferns contribute to the saturation of the aquatic environment with air, absorbing carbon dioxide.