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What fish live without air in the aquarium

maintenance, care, compatibility

What fish can live without oxygen and filter :: aquarium fish breathing atmospheric air :: Aquarium fish

Many fish intended for keeping and breeding in captivity, can not do without oxygen and filter. But not all!

There are wonderful aquarium fish that freely do without an aerator. Name them – betta, or cockerel.

The question “opened a pet store. Business is not going. What to do? “- 2 answers

1. The main advantage of these fighting fish is that they can live without oxygen and a filter. The fact is that cockerels breathe atmospheric air. Moreover, they don’t 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 cockerels 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!

2. That’s just the breeding of these fish can cause some difficulties, and not everyone wants to become a professional breeder. Many people generally keep cockerels for enjoying their beauty. The cockerels are not whimsical in the rest of the service: they feel great in stale water, and also have no 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!

3. Betta aquarium fish (or cockerels) are members of the labyrinth family. It is no coincidence that these fish have been dubbed “cockerels”. The fact is that their color and combative fighting character reminds of beautiful and cocky cocks.

For example, if you put two betta males in one aquarium, then a real cockfight with loose fins and tails can begin. If time does not separate the “fighters”, then one of them will die.

4. In general, cockerels are descended from Vietnam, Indonesia and Thailand. There they live in warm and small reservoirs with stagnant and silted water. That is why an aerator is not needed for saturating an aquarium with cockerels.

Males have an oval body, elongated in length and slightly compressed at the sides. The length of the calf of males reaches 5 cm, and in females it is 4 cm.

Dark stripes are arranged along or across the body of the cockerels. Upper fin has a rounded shape. The bottom starts from the head and comes to the tail.

The pectoral fins of cockerels have the correct pointed shape.

5. It is believed that the beauty and uniqueness of color is not equal to these fish. The males are motley, and their colors shimmer from red to pink, from pink to yellow, from yellow to orange, from orange to green, taking all sorts of shades.

Especially bright color can be observed in males, arranging a “cock” fight. It is curious to watch the fish even when they inflate their gills in an excited state, forming a kind of bulging “collar” around their head.

What unpretentious aquarium fish successful for a beginner who does not have much experience in maintaining the aquarium? When there is a desire to create good conditions for their pets, you can choose small and beautiful fish with a peaceful disposition, who can live in not very capacious tanks.

Guppies are one of the most popular decorative pets in an aquarium. Outwardly very bright, cute, have a beautiful tail.

You can keep in small tanks of 40 liters, are able to transfer changes in water parameters. Some guppies can withstand the lack of filtration, aeration, plants, although such a settlement is not strongly recommended.

Guppies are prolific, viviparous fishes. Perfectly get on with small and peaceful fishes. For this reason, they have been popular in our country for many years.

In addition, the variety of color patterns is striking – you can choose a school of fish of different colors, whose offspring will be even more colorful.

Watch a video about the content, care and reproduction of guppies.

Swordtails – they are easily recognizable by the tail fin, which in males ends with a “sword” in the lower base of the tail. There are also many types of swordtails: color variations, sizes, behaviors prove that these are very interesting pets.

The main advantage – they are hardy, livable with many ornamental fish, do not spoil the aquarium decorations. It is advisable to settle in a 20-50 liter tank, where there are many shelters and dense vegetation.

Swordtails can stand up for themselves – they can be accommodated with active fish that love to disturb their neighbors. Swordsmen are survivable because the female of this species suddenly becomes a male, which saves her in a critical situation.

Somiki corridors – unpretentious inhabitants of home aquariums. As you know, catfish are generally undemanding in maintenance, they are even ready to help in cleaning the tank – they eat up the remnants of undernourished food, eat algae.

Do not bother their neighbors, because they float in the lower layers of water. Corridors can be called “two-breathing” fish, except for gill breathing, gather air in the intestine, which helps them survive in the absence of aeration. The nature of the fish is calm, peaceful, they can be settled even with larger fish.

It is better to have a flock. The minus of these pets – some individuals carry with them parasites, if kept before the purchase is wrong.

Their sizes are small – from 3 to 10 cm, so you can settle in small aquariums.

Mollies are viviparous fishes of the Pecilia family. Rather hardy, maintain small changes of parameters of water. However, their bodies do not withstand bad biological stress – dirty water, low water temperature, fresh water.

Prefer salted ponds and bright lighting. Some mollies may conflict with the swordtails, barbs.

The character is peaceful but unpredictable.

Tetras are another popular fish of the Kharacin family. Unlike corridors and guppies, they will not be able to survive under stringent conditions of maintenance – they need a lot of dissolved oxygen in pure water.

Schooling fish, you can settle in a common tank with a capacity of 35 liters, a flock of 5-6 individuals.

Gourami – easy-to-keep fish, suitable for beginners. Need a portion of atmospheric oxygen, so you have to follow the aeration.

Gourami are able to stand up for themselves, they eat live, frozen and vegetable food. Sometimes gourami can show aggression towards the fish of their own species.

See how to contain pearl gourami.

Barbus – easy to care for and keep pets, but with what character! Considering the fact that they are schooling fish, they can reach other neighbors, especially bright ones with lush fins. These are pirates of domestic aquariums, they can disturb even large cichlids, they are not suitable for a small common aquarium.

Advantages of barbs – endurance, livable, beautiful appearance.

Caring for aquarium fish – the whole science. At first glance, it is impossible to remember all the conditions and requirements for the content, it is difficult to find the means to purchase a huge aquarium and expensive equipment for it and time to prepare special feeds and regularly test the water.

But there are fish that will forgive the newcomer for his inexperience and possible mistakes, and caring for them will not require huge material and temporary resources from him. About these simple to care, tenacious and unpretentious inhabitants of the aquarium and will be discussed.

These include such popular species as ternets, neons, various tetras: copper, firefly, rhodostomus. Small, very charming schooling fish with interesting colors, red and golden spots, glowing neon stripes.

In ternation, the color is not bright, but its albino form was learned to dye artificially, receiving multi-colored fishes, called caramels.

The mentioned representatives of the haratsin ones are capable of living in small aquariums, however they are more demanding in terms of conditions. In particular, they prefer soft, acidic water and do not like massive changes, so the water for the aquarium is better to peat and change regularly, but little by little.

In addition, in the aquarium with these fish is very desirable to have live plants.

So, a little about the financial component. The more fish, the more should be their home – an aquarium. The larger the aquarium, the more expensive the equipment is to it.

Thus, the more fish and aquarium, the greater will be your expenses.

Now let’s conditionally divide all aquariums into three groups:

1st group: aquarium up to 50 liters. In such an aquarium only small and peaceful fish can live. These include:

Guppy Swordtails
Mollies
Tetras
Ternetsii
Congo Danio

Considering the desire of many newbies to go in for larger fish, you can try to get:

Gourami
Torakatum Goldfish (1pc.)

2nd group: aquarium from 50 to 100 liters. In such an aquarium, small cichlids and small fish with average aggression can already live. These include:

Tsikhlazoma black-striped
Angelfish Barbusses
Labeo
Botsi

3rd group: aquarium from 100-200 liters. Here the flight of your imagination begins – you can wind up any fish, with the exception of very large and capricious fish.

4th group: aquarium from 200 and above. Suitable for all fish, even for such as Astronotus (preferably from 500l.) and Discussion!

The optimal temperature for fish in an aquarium and how to maintain it

Fish are cold-blooded animals, the full activity of which is ensured by the constancy of the water temperature in the habitat. The body temperature of the fish exceeds the water temperature by about 1o.

Changing the temperature of the habitat directly affects the health of cold-blooded organisms.

All holders of aquarium fish should understand that the life of their pets directly depends on the temperature conditions in the aquarium. What should be the optimal water temperature for different ornamental fish, and how many degrees should be reflected on the scale of the thermometer so that each fish feels healthy?

About temperature limits for warm and cold-water inhabitants of reservoirs

The fluctuation of aquarium temperatures is possible, it is even permissible within certain limits. A slow change of 2-4 degrees will not lead to tragic consequences. If the aquarium is placed on the window sill or near the window, then depending on the time of year, the temperature will change in it.

Aquariums should not be installed near batteries and other heating systems, even heat-loving fish will not survive strong heating.

What can be the water temperature for different fish? You can set the average range of oscillation for cold-water and warm-water fish, but these are not settled in one aquarium – this is prohibited. How many degrees should be acceptable temperature limit, which would be acceptable to all:

  • 24-26 degrees Celsius

See how in the heat to lower the temperature in the aquarium.

Temperature fluctuations should not exceed three degrees! Before settling in the fish aquarium, find out what the average temperature range of their content.

It is also worth controlling to above water – this is important for labyrinth fish that breathe portions of air from the surface. As an example, you can explore the content of the labyrinth fish gourami, which, breathing the air 5o below the water, can suffocate and die.

Just for them, the cold air is critical.


It is recommended to install a thermometer and thermostat for water and air to keep the gourams. Water should evaporate in a minimum amount, and to water above water should be similar to that in a pond.

If gourami inhale too hot or cold air, the untreated oxygen enters the labyrinth channel, clogs it, and the fish suffocates.

Gourami are temperature sensitive because it affects the breeding cycle. Warm water is an incentive to spawn, in this period it is appropriate.

If it is warm all the time, in the body of gourami the processes of vital activity slow down, the protective functions of the body are reduced. At an incorrect temperature, sex cells are not produced, and gourami will not give offspring.

Surviving fry in the wrong aquarium water conditions die.

Allowable temperature for gourami in water: 23-26o, to air on the surface – 26-28o.

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