Fish that live without oxygen in the aquarium


What kind of fish don't need air?

What fish can live without oxygen? In fact, these fish do not exist. Like any living creature, they need a constant flow of liquefied or atmospheric O2. Usually fish breathe with the help of gills, which in each species of fish differ in size and shape. Gill slits are located on the sides, there are 4-5 pairs. The water that passes through the gill petals, gives up dissolved oxygen, and carries away the released CO2, then oxygen enters all parts of the fish's body. Another thing, if we are talking about oxygen from water or the atmosphere.

Two-headed fish species

Some fishes are capable of living not only in water, but also on land, among them are relict representatives of the family Mnogoperovye (polyterus, kalamoiht, Nile mnogoper). Due to the special structure of the swim bladder, they are able to capture air from the atmosphere and breathe it for a long time, so they periodically live on land.

Watch a video about the Senegalese polypterus.

There is a family of fish that need atmospheric oxygen - this is Macropod. These are the well-known aquarium liliusi, gourami, cockerels, colises, nitropods. Some members of this family have a unique labyrinth organ that allows you to inhale and dissolve atmospheric oxygen.

In addition to these species, there are representatives of other families of hydrobionts, which can get portions of air into the intestines. These include speckled catfish corridor, gaining O2 in the anus. Intestinal breathing allows you to accelerate in the water due to a portion of air, so you can periodically observe how these fish quickly rise up and back down.

Oxygenated aquarium aerator

Since there are no such fish that can live without oxygen, it is necessary to figure out, but do “two-breathing” hydrobionts need any special conditions? Yes, and the main condition - mandatory aeration in the aquarium. Such inhabitants can live in an aquarium in which there is access to atmospheric and diluted O2 in water. Gathering on a long trip, an aerator is also needed to save the lives of these pets. The gap between the aquarium cover and the surface of the water should be slightly open so that they can breathe in their portion of air.

How do medications and elevated temperature of water affect the supply of oxygen?

When the fish are sick and sitting in quarantine, drugs can save them from the disease. However, instead of adding drugs, it is often necessary to raise the temperature of the water so that the fish become healthy. This applies to heat-loving tropical species, which become lethargic and weak due to the decrease in temperature in the reservoir. As a rule, when adding drugs, they increase aeration, since substances block oxygen supply to water. Therefore, the presence of a good filter is an additional help that will help the exchange of oxygen around the water perimeter.

Increased temperature also limits the flow of oxygen into the water, so aeration should be enhanced. This is important for cold-loving fish and amphibians that need oxygen. Powerful aeration and lowering the temperature of the water in the aquarium to the permissible rate will quickly eliminate the problem.


If the filter does not mix all layers of water, then it must be adjusted so that it has more turbulence. In this case, you can add an aerator. The so-called internal filters are located on the back wall of the aquarium, have strong power, pushing oxygen into the water. But canister aquarium filters need to be configured so that water is pumped and mixed on the surface. Bottom filters do not saturate water with oxygen, so the pump is attached to them. Spongy dry and wet aqua filters well saturate the water with oxygen, mixing the water, and therefore more acceptable.

Watch a video about aquarium sprayers.

What to do if you have to transport the fish over a long distance?

During the forced travel to long distances with fish, you have to take risks. Adding an aerator to the carry is vital. It will provide the fish with enough dissolved oxygen, and relieve them from stress. You can buy a battery aerator / pump that will last a long time. They sell the power supply, so do not have to worry about its performance.

Signs that determine that fish need more oxygen

If the fish often begin to take air from the surface of the water, even those that spend most of their lives in the lower layers of the aquarium, this is an alarming signal. They really need oxygen dissolved in water. What measures to take in this case? First, measure the water for ammonia, nitrite, and nitrate. If the amount of harmful contaminants is increased, replace 40-50% of the water with clean, fresh and acceptable parameters. Do not pour out all the water, it is detrimental to the lives of pets. If indicators of ammonia and nitrates, nitrites are normal, then increase the aeration and add air stones to the water.

Air stones - what for and for whom?

Air stones are commonly used in a water filtration system, there are various types of such stones, of different shapes and sizes. They are necessary for fish that breathe a labyrinth organ, saturate the water with additional oxygen. Small stones float on the surface of the water due to the light and floating composition. Stones with high weight can be placed at the back wall of the aquarium, additionally decorating it.

Aquarium fish that do not need oxygen

The distinguishing feature of the labyrinth family of fishes is the structure of their respiratory system. Adapting to living in oxygen-poor water, the fish of this family developed a nadzhaberny body - the so-called labyrinth. The system of channels in the cavity of the gill arch is called a labyrinth organ.

Fish from this family gasp air through their mouths, which enter the nadzhaberny body, where blood is enriched with oxygen in the air. Lingering in the labyrinth, the air allows these fishes to remain without water for some time or live in water that is poor in oxygen.

Since the air such fish grab from the surface, then in a tightly closed container, they very quickly die. This specificity must be considered when transporting them. When these fish are transported in closed cans, labyrinth aquarium fish without oxygen die very quickly.

Most of the fish in this family have beautiful coloring and original body shape. Many fish have an original feature - they touch various objects with the help of modified threadlike fins. The natural habitat of most labyrinth fishes is standing or slowly flowing water bodies, rice fields or irrigation ditches, densely overgrown ponds and shallow rivers. The water in these bodies of water is usually very dirty, with a low content of oxygen, which served as the formation of a labyrinth organ.

Most labyrinth fish do not pose any problems in their content. The volume of their place of residence is not particularly important. Like fish that do not need oxygen, they suggest some conditions of their maintenance:

  • The temperature of the aquarium water should be 24-27 ° C.

  • The soil used should preferably be of a dark color - this enhances the color of the labyrinth fish, which emphasizes their beauty.

  • For females of this family, dense vegetation is needed, so that there is where to hide from aggressive males.

Labyrinth fish are not particularly picky to feed and willingly eat both live food and dry or frozen.

Keeping them together with representatives of another or one’s own fish species is often problematic. Many adults (often males) show aggression towards the fish of their own species. Especially often this happens when the volume of the aquarium is small.

In order to have peace and quiet in the aquarium, the water must be "old"; water replacement provokes the breeding instinct and causes aggression.

The Cockerel Fish: content, compatibility, reproduction, photo-video review

content, compatibility, reproduction, photo-video review

Amazingly beautiful, beautiful, unpretentious, bold - all these words can be applied to the cockerel aquarium fish. Aquarium cockerels have a bright variable color. Males, of almost all types of cockerels, have chic, veiled fins. And their content and breeding does not represent any complexity.

That is why cockerels are among the most popular fish among beginners in the aquarium world, as well as among professionals, who contain beautiful breeding forms, exposing them to competitions.

To understand the beauty and temper of these fish, I’ll give below a literary description of the behavior of cockerel fish in nature from I. Sheremetyev’s book: “Along with beautifully colored gouras, a grayish-green fish doesn’t immediately strike her eye. Her body is 6 cm long, slightly compressed sides, elongated. On the sides there are turbid longitudinal stripes with a greenish sheen.

And the same gray, inconspicuous fish approached the fish. And suddenly, as if something had flared and shone in a small body. The body and splayed fins have become emerald. The fish opens the gill covers and goes to meet the guest. Who is it - the female or rival - the male, the fish can determine only when he sees what the stranger will answer. The female is in front of a gorgeous male, obeying, placing fins. If she is not ready for spawning, she immediately flees. If two males meet, their intentions will be more serious than can be imagined. Mutual posing begins, demonstrating brightness, playing brilliance and fin sizes.

This can take several minutes, and sometimes an hour. If one fish turns out to be half the size of the second, then it leaves another area. But, if males are the same size, then the first blow will be made sooner or later! Within minutes after the start of the fight, the fins of a weaker male hang down in pieces, the gill covers are broken, the body is covered with bloody wounds. Fishes do not bite, and having opened their mouths so that their teeth stick out ahead, with all their might they drive dozens of needles into the body of an opponent. After some time, the opponent is defeated, ... the male who won the fight, does not allow him to the air and the surface. The loser is killed! "

Beautiful, professional photo of a rooster fish

Let us take a closer look at these amazing representatives of South Asian reservoirs.

Latin name: Betta splendens;

Russian name: Cockerel fish, Siamese cockerel, cockerel, chicken, betta, fighting fish;

Order, suborder, family, subfamily, gender: Perciformes -Perciformes, Anabantoidei, Osphronemidae, Macropodusinae, Betta

Comfortable water temperature: 25-28 ° C.

"Acidity" Ph: It does not matter, but comfortable 6-8;

Stiffness dH: does not matter, but comfortable 5-15 °;

Aggressiveness: cockerels - Betta relatively peaceful fish - they can not be called predators. However, they have a strong intraspecific aggression and territoriality. Keep two males in a small aquarium is not possible. The dominant male will surely kill the weaker. Two or more males can be maintained only in large and wide aquariums, while fights for territory and females still cannot be avoided. In addition, males often show aggression and to a "disliked" female during spawning.

The complexity of the content: easy;

Cockerel fish compatibility: in addition to the previously mentioned intraspecific aggression, the aggression of fish extends to all small, clumsy and voile fish. Therefore, you can keep them, only nimble, active fish that will be similar in size. As a recommendation, it is possible to advise in the neighbors of the males: corridors (speckled catfish), danios, molines, swordtails, other nimble petilles, tetras.

Males are not compatible with cichlids, the family of goldfish, other labyrinth fish are not desirable. Not compatible with snails, they eat small snails, and large ones cut off their whiskers.

In addition, when combining fish you should always take into account the similarity of conditions and water parameters, for more information on the compatibility of aquarium fish, see HERE!

How many live: Cockerel fish are not aquarium long-livers, their age is short - only 3 years. Find out how much other fish live HERE!

The minimum amount of aquarium for cockerel fish

The question of the volume of the aquarium for these fighting fish is a separate topic.

Alas, almost all pet stores sell these luxury fish in 250ml. glasses, while sellers tell people that these are “unique fish”, they say they do not need oxygen, filtration, that they feel great even in a glass !!!

Do not believe the sellers of pet stores, their task is to sell the goods, and what will happen next with the fish, with you and the tears of the child who saw the cockerel floated up with a belly up - DOES NOT INTEREST THEM !!! And yet, you would know how many cockerels do not live by the pet store until the time of purchase !!! You would sincerely feel sorry for these innocent fish !!!

Yes, of course, cockerels are hardy fish, in natural habitat they live in muddy, silted, oxygen-free rice fields. But this does not mean that they can be kept in a small glass with water. Firstly, because the conditions of keeping of any animal should be as close as possible to the natural living conditions. Monkeys must jump in trees, birds fly, and fish swim !!! When the cockerel fish just hangs in a glass, dropping the fins - this is actually a sad sight. Secondly, in the cup, vase and other small vessels there is no biobalance at all. In the rice field, for example, various biochemical processes take place that purify water from various poisons (ammonia, nitrites and nitrates), these processes are absent in a glass with water, the poisons accumulate, the immunity of the fish weakens and it dies. Biological equilibrium in artificial conditions can be achieved only in spacious aquariums, and the more, the better.

So, the minimum amount of aquarium (decorative vase, etc.) for cockerels should be 3 liters. To call such a vessel an aquarium is difficult in all senses, and therefore, if we talk about creating a full-fledged aquarium, the minimum volume for one individual should be 5-10 liters. In such an aquarium, you can put a mini-filter, such an aquarium can be beautifully — naturally, you can plant aquarium plants, set up a bio balance, and taking care of such a reservoir is much easier than washing the “pot” weekly, while delivering great stress to the fish. A good volume for a pair of Bette is considered an aquarium from 20-30l.

About how much you can keep the fish in the X aquarium, see HERE (at the bottom of the article there are links to aquariums of all volumes).

Requirements for the care and maintenance of cockerel fish

From the above, we can conclude that in one, a small aquarium, you can contain only one male cockerel. If the aquarium is large - from 100l. You can try to plant the second male or make transparent partitions in the aquarium, for example from plexiglass, pre-drilled holes in them to circulate the water in the aquarium.

In addition, I advocate the creation of a natural - natural environment in an aquarium. The aquarium can and should be decorated with stones, grottoes, snags, as well as living aquarium plants. The lighting should not be very bright, preferably the presence of filtering. The aquarium itself should not be filled with water to the brim, you need to leave 7-10 cm and be sure to cover the aquarium. All labyrinth fish and cockerels in particular breathe atmospheric air, swallowing it from the surface of the water. In the absence of airspace or access to the surface of the water, the fish will suffocate. A lid is needed to ensure that the air swallowed by cockerels from the surface of the water is not too cold.

An aquarium with cockerels can be equipped with artificial plants, but still, if you have the opportunity, purchase live aquarium plants. With live plants, the aquarium looks more natural, the plants themselves contribute to biological balance, and the males can also use them for spawning and creating a foamy nest. Of unpretentious plants for cockerels can recommend: vallisneria, rogolini, cryptocorynes, other not complex plants.

Feeding and diet of cockerels: they are not whimsical in food, they are happy to eat both dry and live food (Artemia, bloodworm, etc.). The males eat any brand-name dry food, but advanced aquarium brands have developed special ones for them - individual foods that are best suited. Feeding aquarium fish should be correct: balanced, varied. This fundamental rule is the key to successful keeping of any fish, be it guppies or astronotuses. Article "How and how much to feed aquarium fish" talks in detail about this, it outlines the basic principles of the diet and feeding regime of fish.

In this article, we note the most important thing - feeding fish should not be monotonous; both dry and live food should be included in the diet. In addition, you need to take into account the gastronomic preferences of a particular fish and, depending on this, include in its diet ration either with the highest protein content or vice versa with vegetable ingredients.

Popular and popular feed for fish, of course, are dry food. For example, hourly and everywhere can be found on the aquarium shelves of food company "Tetra" - the leader of the Russian market, in fact, the range of feeds of this company is striking.In the "gastronomic arsenal" of Tetra are included as individual feeds for a certain type of fish: for goldfish, for cichlids, for loricarids, guppies, labyrinths, arovan, discus, etc. Also, Tetra has developed specialized foods, for example, for enhancing color, fortified or for feeding fry. Detailed information on all Tetra feeds, you can find on the official website of the company - here.

It should be noted that when buying any dry food, you should pay attention to the date of its production and shelf life, try not to buy food by weight, and also keep the food in a closed state - this will help avoid the development of pathogenic flora in it.

In nature, live: Southeast Asia: Indonesia, Thailand, Cambodia, Malaysia, Vietnam. They live in stagnant, oxygen-free waters - puddles, ditches, rice fields.

Description: Very beautiful fish, its veil tail and fins just fascinate. The color of the fish is different. The most common ink color with a reddish tint. Males are colored much brighter, fins are longer than those of females. The size of the fish is 5-10 cm. The body is laterally compressed, elongated, oval. They have cycloid scales, pointed pectoral fins, upper and tail fin of a rounded shape, the lower fin originates from the head and ends at the base of the tail.

The history of cockerel fish

The first mention of the fish dates from the beginning of the nineteenth century, it was then that the people of Siam paid attention to these small, but lively and aggressive fish. Then the Siamese began to cross wild individuals Betta and got a new kind of fish, calling it "biting fish." A couple of copies of these "pieces" in 1840. King of Siam handed over to Dr. Theodor Cantor, who in 1849 gave them the name Macropodus pugnax. After 60 years, the British ichthyologist Charles Tate Regan renamed them "Betta fish", arguing that the Macropodus pugnax species already exists in nature.

It is known that the cockerel fish appeared in Paris in 1892, in Germany in 1896, and in 1910 appeared in the United States with Frank Locke from San Francisco, California. Through the selection of these fish, he received a "new" fish, calling it Betta Cambodia - one of the first color variations of Betta Splendens. The history of the appearance of Bette in Russia is not truly known. There are several versions. The first is associated with aquarist VM. Desnitsky, who allegedly in 1896. brought from Singapore exotic species of fish and plants, but it is not known for certain whether there were any cockerels among them. The second version says that the aquarist V.S. Melnikov approximately in the same period spread a number of labyrinth fishes in Russia. By the way, a competition for the best fighting fish was established in his honor. And the latest version says that the fighting fish were brought in by the Frenchman Seysel, and all descendants from Russia and Europe went from his fish.

Types of Bette and Petushki selection forms

The first thing I want to say is that the cockerel fish (Betta splendens) is one of the Bett species. Bette species should be distinguished from Betta splendens breeding forms. On the Internet, everywhere breeding forms of a rooster are given for species, which is not correct!

So, the Bette's species include: Betta picta (Betta picta), Betta striped (Betta taeniata Regan), Betta smaragdova (Betta smaragdina Ladiges), Betta untamulata (Betta unimaculata), Betta black, she’s also the dwarf, Cockerel black, she’s black, she’s black, she’s black, she’s black, she’s black, she’s black imbeIIis ladiges), Cockerel (Betta splendes).

And here, the selection forms of the Cockerel (Betta splendes) include:

In size and shape of the fins:

- Vualekhvosti warrior fish or "veil rooster"

- Deltatail fighting fish

- Giant or royal fighting fish

- Crescent-tailed warrior fish

- Round-tailed warrior fish

- Crescent-tailed warrior fish

- Deltatail fighting fish

- Flagtail fighting fishes

- Poster fighting fish

- Crowntail fighting fish

- Poster fighting fish

- Crosstail fishes

- Two-tailed fighting fish

- other

By color:
Multicolor "multicolor", two-color, one-color.

Photos of some breeding forms

(Betta splendes)

Reproduction and breeding aquarium cockerel fish

It is not difficult to breed these fish - it does not need any special conditions or, for example, a hormonal injection. In fact, under optimal conditions, spawning can occur in the general aquarium.

It is much more difficult to find a good pair of producers than to spawn itself. And if we talk about breeding breeding of cockerels, then the issue with the selection of parents arises squarely.

General information about spawning and breeding cockerels.

The sexual maturity of the cockerel reaches 3-4 months. From this period they can begin to breed.

Sex differences in fish are pronounced - males are larger than females, their fins are much larger and males are, as a rule, brighter than females. In addition, the female ready to spawn can be distinguished by the white "grain", "star" in front of the anal fin - this is the egg-deposit, as well as by the large abdomen.

pictured male and female cockerel

An aquarium for spawning may not be large from 10 liters, the water level in which should be 10-15 cm. A spawning aquarium should not have soil and is equipped only with shelters for the female, for example, with crown, as well as with small bushes of perististoistnye plants, for example, with roetail. You also need to use plants that float on the surface of the water: duckweed, piste, water-colored plant These plants are used by the male in the construction of the so-called "foam nest".

The temperature in the spawning tank should be in the range of 26-30 degrees Celsius. Different sources, write different data on the temperature regime for spawning Bette. Taking into account the analysis, I think that 28 degrees is the norm. This temperature is optimal and makes it possible to increase it by a couple of degrees, thereby stimulating spawning.

Spawning and soft water is used for spawning aquariums. Soft water is an incentive to spawn. You can soften the water aquarium chemistry - preparations containing peat, and other methods. In addition, in the spawning aquarium is recommended to throw a leaf of almonds (see Herbal medicine for fish and aquarium).

Before spawning, the producers sit for a couple of weeks, and are abundantly fed with live food. After spawning in the aquarium, the first place the male, which begins to settle. As soon as he begins to build a foam nest, a female with caviar is brought to him !!! The presence of calf in the female can be determined by the rounded abdomen.

If the spawning process does not start or the male does not pay attention to the female, the spawning should be stimulated: by softening the water or replacing the water with fresh water, raising the temperature by 2-3 degrees. If after these manipulations, spawning does not begin, you can try to plant another male in the presence of the male (if you have one).

But, usually the above described problems with breeding cockerels do not arise, in the evening the male already finally builds a nest, and in a day the calf already matures in it.

IMPORTANT!!! Stimulating fish in a spawning aquarium with live food is prohibited. At the time the producers are in spawning, they are not fed at all in order to avoid contamination and unwanted fungi and bacteria.

The process of spawning itself is very interesting. It begins with the fact that the male swims up to the female, hugs her and squeezes 2-5 eggs out of her. Eggs begin to fall to the bottom, the male quickly collects them in his mouth and places them in a foam nest. This "hug and spin" process is repeated several times.

A visual indication that the spawning is over is the male’s circling over the foam nest and the female’s seat in the shelter. As soon as this moment has arrived, the female is removed, since in the eyes of the male she begins to carry a threat to the offspring, which is why he can kill her. The deposited female is abundantly fed. Further, all the care of the clutch and the offspring takes the father! The main thing at this moment is not to disturb him. After one day, the larvae will appear, and after another day the yolk bladder will dissolve in the larvae and they will begin to swim.

You can remove the happy "father" and start feeding the fry with living dust by infusoria, or, for example, as some members of our site do it with melted water from Artemia frost. You can also try dry fish "baby food", for example, Sulfur Micron. Such feeds are either diluted in a bowl and the resulting suspension is poured into the spawning unit, or they take the feed at the tip of a finger and, grinding it in water, feed the young fish. Food in the aquarium should be present constantly. When feeding with live food (ciliates), water does not change, and when feeding with dry food, 80% of water is replaced daily in order to avoid contamination and mortality of the young. To maintain cleanliness in the aquarium, you can place snails ampoule or coils.

In the future, young cockerels are gradually (3-4 days) transferred to larger feeds, starting with Artemia nauplii, etc. After about two weeks, you can begin to try to give "adult" feed.

Many beautiful photos of cockerel fish

Interesting video spawning fish cockerel

The first video is especially recommended - Nerst of cockerels, very beautiful HD shooting !!!

The most unpretentious and small aquarium fish with photos

The most unpretentious aquarium fish, the smallest aquarium fish. TOP 10 DIFFICULT FISHERS Keeping fish is not as difficult as it sounds. However, aquarium fish, like any living creature, require care and time, which many people, by virtue of employment, simply do not have !!! This topic is left based on the following requirements for aquarium fish: unpretentious fish, small fish, easy-to-keep fish, the most enduring aquarium fish, tenacious fish, easy-working fish. 1 place Guppy

I think many aquarium fish experts will agree that the first place is given to guppes.

Everyone probably knows these fish ... even those who have never seen aquariums. We can say that these fish are the fish of all children of the former USSR (they were in all Soviet aquariums))). The fish is very beautiful and unpretentious. The tail fin is her beauty. The simplicity of the fish is that it can withstand "harsh conditions of detention." I happened to see an aquarium with guppies. without aeration, without filtering, without plants, without proper feeding etc. - horror, terrible dream aquarist. Nevertheless, guppies managed not only to survive in such an aquarium, but even tried to multiply. So you should not mock the fish !!! But their endurance and vitality sometimes affects.


2nd place Swordtails

A very famous fish, as a result of persistent selection, a large number of swordtails of various colors and shapes were bred. Males are distinguished from females by the presence of a "sword" on the lower edge of the caudal fin.

Swordtails are kept in flocks in a densely planted aquarium. The minimum size of the aquarium from 10 liters (but better is more). A good volume of aquarium for a small group of swordtails is 50 liters.

An interesting fact about these fish is that the female swordtail can “at some” moment become a male, i.e. change the floor. This is due to the struggle for the survival of the species.


You can read more about MUCHENORTSAKH here ...

3rd place Somiki corridors

It should begin with the fact that all aquarium catfish - a priori unpretentious. Moreover, they are "nurses of the aquarium world": they clean the soil and eat the remains of vital activity. The corridors are chosen from all catfish, since in addition to the gill, they have intestinal respirationi.e. if aeration stops, they will live for a long time.

The fish are very peaceful, calm. They slowly swim along the bottom in search of food. In the aquarium they are usually kept in flocks. Fish, do not pose any threat to other inhabitants of the aquarium.

You can read more about CORRIDORATUSES here ...

4th place Mollies

Molly, like guppies - viviparous fishes. Unpretentious and tolerant of poor conditions. Nevertheless, they are more capricious than the “troika winners”.

Fish suitable for beginners and young aquarists. The fishes most difficult to keep from all members of the family are demanding of conditions, they do not tolerate low temperatures, some like “salty” water, like bright light, etc.

You can read more about MOLLINESIA here ...

5th place Tetras - Harazinki

All tetras are small, brisk, not capricious fishes. However, they will not be able to survive in "Spartan conditions" as guppies. They need aeration and filtration. You can keep them in an aquarium by a group (from 5 individuals) with a volume of at least 35 liters of water.

You can read more about TETRAH here ...

6th place Ternetsii

Very famous little fish. Fish energetic, mobile. Fish get along well with other types of fish. Somehow my terntions even lived with small cichlids. Recommended aquarium with a volume of at least 30 liters of water, densely planted with plants. Aeration, filtration - yes!

You can read more about TERNIA here ...

7th place Danio (rerio, pink)

Starting from the 5th place TOP, all the fish require unpretentious attention. Tanks are different from them - briskness and speed of movement. They can coexist with many species of fish, even with fish of medium and increased aggression: scalar, goura and even with small cichlids.

Read more about DANIO here ...

8th place Torakatum

One of the famous large catfish of the aquarium world and excellent attendants of the aquarium. Peaceable and unpretentious to the content. They can be kept in a common aquarium with thickets of plants and a large number of shelters. Fish, do not pose any threat to other inhabitants of the aquarium. Compatible with all kinds of fish. The neighbors are not recommended only one hundred percent aggressors and predators.

You can read more about TORAKATUM here ...

9th place Gourami

Gourami - are medium sized fish. Entered in this TOP due to gill labyrinth - fish do not need aerationthey breathe atmospheric air. Really peaceful fish, but sometimes aggression. Some individuals taken separately are even very aggressive, as they say, as lucky.You can read more about GURAMI here ...

10 place Barbus

Barbusses are schooling, small fish that can stand up for themselves! If you decide to start barbs, I recommend to allocate for this a separate aquarium, "barbusyatnik." "Pirate" temper, the ability to stand up for themselves - deserve 10th place. You can read more about BARBUSH here ...

Of course, the above TOP is conditional - always remember the words

Antoine Marie Jean-Baptiste Roger de Saint-Exupery

"We are responsible for those who have tamed"

We also recommend you to look at the colorful brochure "Popular types of aquarium fish". This brochure contains all popular types of fish, with a description of their conditions of maintenance, compatibility, feeding + photos.

(to view or download, click on the image)

An interesting video about unpretentious and small aquarium fish

Additionally, we invite you to view a large photo collection of small and unpretentious aquarium fish

What fish can live without oxygen and filter. With an open aquarium?


Labirint, or creeping (Latin. Anabantoidei, outdated name - Labyrinthici), is a suborder of perciformal fishes, which have a labyrinth organ, which allows fish to additionally breathe atmospheric oxygen. Predominantly freshwater fish with intermittent African-Asian distribution; Missing in Madagascar. Possess a wide variety of morphological and behavioral signs.
Gourami, macropods, swordtails, lyalius and many other famous aquarium fish.


Do not forget about plants and snails (they are part of the natural purification of water)


Without oxygen in our area - hardly any. Any water has to be heated, and so that warm water does not collect at the top of the aquarium, air blowing is required to mix the water. Therefore, in the winter, even in a fully overgrown aquarium, where there is enough oxygen, the macropods and cardinals have to switch on the compressor at the same time as the heater.

Elena Gabrielyan

It is undesirable to keep fish without a filter, since waste and food decomposing at the bottom will spoil the water and it will have to be changed frequently in a small aquarium, this will solve the problem using a filter, and labyrinth fish live without oxygen: Cockerels, Gourami, Lyalius

Alexander Komendantov

All fish are aerobic, no one can live without oxygen. Without aeration is another matter, the question of the volume of the aquarium. If a large aquarium - any. The labyrinth, lungfish, anabass, jumpers, and many catfish can live in a minimum amount without aeration — they are all able to breathe atmospheric air. If you put a heating pad on the bottom along the back wall - there will be no problems with water stratification.

Victor Melkozerov

Any. The main thing that there was no resettlement, the calculation of 3 l on the fish, guppies do not count, the labyrinth will take less. Flush live food, water will not need a clean filter. In the water or silver spoon or coin. Greetings from St. Petersburg.

There is a round aquarium is not big any fish there can be kept without oxygen


Only a few species can be found in such aquariums, for example, guppies, catfish corridors, cockerels, lyalius, neons. Depending on the displacement and the characteristics of the selected fish, you need to calculate their number. In an overpopulated aquarium, maintaining biological balance is extremely difficult. But to settle the small fish in small numbers is also not worth it.
It is problematic to choose and decorate equipment for fish care. With a small volume is very limited choice of species of fish, plants and jewelry. And in order to maintain a balance in such an aquarium, you will need certain knowledge and experience in aquarism. Just do not forget that the fish that live in round aquariums, are in a state of constant stress.The reason for this is the lens effect that occurs in round-shaped aquariums. Of course, this condition adversely affects the health and life expectancy of the inhabitants of the aquarium. Also a big misconception is that a small round aquarium is suitable for a goldfish, which actually needs a very large amount of water.
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WomanAdvice Magazine - Tips for All Occasions

How long does a fish live without oxygen?

Andrey a

It depends on how many fish you have and what size they are ... as an option - you pump up the camera from the car more, attach a spray hose to it - and go ahead !!! One minus - the air from the chamber will stink of rubber ... you can dream up on this subject ...

Olga Andreeva

I have an aquarium at home - 100 liters, although with vegetation - daily outages of electricity didn’t affect the fish at all. The three-day absence was experienced with the help of a bicycle pump - periodically (once every 3-4 hours) the air was pumped


In principle, you can do nothing, unless of course the electricity is turned off for a long time. I have no compressors (56 and 400 liters) in both aquariums, although there are plants and fish that withstand rather long outages. ice so that t does not rise too high. Good luck!


The cichlid family requires aeration, filtration and regular water changes in the aquarium. Once there were mechanical compressors. Try to find and periodically pump up manually. Maybe they have strong fish and everything will be fine.


Before my husband and I were married, he had neither a compressor nor any plants in a 160 l aquarium. There lived a clown Boca 15cm, 4 corridors and 6 neonok and not one year. It all depends on how densely aqua populated. But I think that the day will survive normally