home Article How many fish can live without oxygen

How many fish can live without oxygen

Labioses

Labioses are labyrinth fish measuring 7-10 cm. On the body there is a pattern of brownish-red and greenish-blue vertical stripes. In nature, lyabioses are found in Southeast Asia in slowly flowing rivers and lakes with dense vegetation.

Labiosa are considered the most peaceful of the labyrinth fish. They have no intraspecific aggression, so they can be kept in pairs or in large groups. This species tolerates temperatures from 22 to 28 ° C, therefore it can live in aquariums without heating. The pond is planted with plants (including floating species) and create a soft filtration without a strong current.

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Acanthophthalmus

Acantophthalmus are members of the loach family. They have an elongated serpentine body up to 12 cm long. The color is yellow-orange with wide vertical brown stripes. There are thorns under the eyes. In nature, acanthophthalmus are found in slowly flowing rivers and streams in Southeast Asia.

Acanthophthalmus are kept at a temperature of 24-28 ° C, pH 6-7.5 and dH 5-10 °. Due to intestinal respiration, these aquarium fish can live without oxygen, but they need clean water, so a filter must be in the aquarium. Acanthophthalmuses like to bury themselves in the substrate and hide under snags and other shelters.

Cockerels

Cockerels are also labyrinth. In nature, they inhabit stagnant bodies of water and rice fields in Southeast Asia. During the time of keeping the species in captivity, breeders have bred more than 70 breeds that differ in color and shape of fins.

The cockerel is suitable for those who want to keep aquarium fish in a round aquarium without a filter. Because of the pronounced territorial behavior and intraspecific aggression, male cockerels are kept strictly one by one. Males do not need a lot of swimming space, so they can be kept in a small aquarium; to keep the water clean, change it 2-3 times a week.

What fish can live without oxygen supply

Fish breathe through their gills. They are represented by the branchial arches, on which the gill petals are located. In the process of breathing, water passes through the gill slits located in the pharynx, washes the gill lobes, and the oxygen dissolved in it enters the blood. For the normal implementation of all internal processes, fish need to live in oxygen-rich water. In water with little oxygen, fish suffocate and quickly die.

However, in nature, water in many bodies of water is poor in oxygen. Fish species living in shallow water bodies, swamps, ditches, puddles, in the process of evolution have adapted to such conditions of existence. These fish have developed organs that allow them to use atmospheric oxygen for breathing.

Fish that are able to breathe atmospheric air and can live in oxygen-poor water include:

  • Labyrinth. These fish capture air with their mouths and direct it to a special labyrinth organ that communicates with the gill cavity. The labyrinth organ is formed by several thin bony plates covered with a mucous membrane, which is abundantly supplied with blood. Oxygen from the air enters the blood.
  • Species with intestinal respiration. These include loach and some catfish. These fish have bowel protrusions in the form of bags on the sides of the body. Fish capture atmospheric air through their mouths, which enters these bags. Oxygen from the air enters the bloodstream through the thin wall of the intestine.
  • Species that use the swim bladder for breathing. These include representatives of the multi-pen family. The swim bladder of these fish consists of 2 sections and communicates with the intestines. Air entrained in the mouth enters the swim bladder, where gas exchange takes place.

Lyalius

Lyaliusi are labyrinth fish that live in nature in slowly flowing streams, lakes overgrown with plants and in rice fields. The body size of lalius reaches 6-7.5 cm.On the sides there is a pattern in the form of vertical red and blue stripes.

They contain lalius in groups dominated by females. Lyalius can live without air in an aquarium, but filtration is desirable. Lyaliusi are rather shy, so it is recommended to plant the aquarium with plants to mimic the natural habitat. The species is sensitive to nitrogenous compounds in water and does not like temperatures below 24 ° С.

Common pinch

Common pinch is a fish of the loach family that lives in water bodies of Europe. It has an elongated body 7-15 cm long.The body color is light brown with several longitudinal rows of rounded dark brown small and large spots.

The pinch is kept at a temperature of 3-30 ° C, pH 6-8 and dH 4-20 °. These are peaceful fish that get along with any neighbors. Pinchfish lead a near-bottom lifestyle and like to bury themselves in the ground. Thanks to the intestinal respiration, these fish can be kept in the aquarium without a compressor. The reservoir should be covered with a lid, as when the atmospheric pressure changes, the pinches become anxious and may jump out of the water.

Gourami

Gourami are labyrinth fish. The body length of most species does not exceed 10 cm. The body is graceful, flattened laterally; the pelvic fins are filiform, transformed into the organs of touch. The color depends on the species and usually includes silvery, golden and brown shades.

In nature, gourami live in shallow water bodies and rice fields in Southeast Asia. They are adapted to life in turbid and oxygen-poor water, so these fish do not need oxygen in the aquarium. However, cover the aquarium with a coverslip to keep the air above the water warm. Cold air damages the labyrinth organ of the fish.

Macropods

Macropods are labyrinth fish 8-10 cm in size. In nature, they inhabit stagnant water bodies of Southeast Asia. Fish have large elongated fins; the sides have a pattern of blue and red vertical stripes.

Macropods are one of the most aggressive labyrinth fish. They are kept in groups of 1 male and several females. Macropods are unpretentious and hardy, they can be kept in an aquarium without a filter or heater. These fish can live without oxygen and tolerate temperatures from 15 to 26 ° C without harm to health. If kept without a filter, water changes must be carried out regularly.

Acanthophthalmus

This fish is rather difficult to care for. They prefer small aquariums. Shelters are needed. stones, driftwood, castles. These fish can jump out, so open aquariums are unacceptable. Breeding them is difficult even for professionals. In food, they can be content with microorganisms from the soil and waste of the rest of the aquarium population, however, they will be happy with live and frozen treats.

How many fish can be populated

It is difficult to answer this question unambiguously. Both the size of the aquarium itself and the size of the pets play an important role. The larger the fish, the more water should be consumed per individual. For example, for a fish 5 cm long, 2 liters of water is enough. If the fish is 8-10 cm, then about 5 liters are already required. For large individuals, the size of which is more than 12 cm, you need about 10 liters of water for each.

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However, there are many exceptions to this rule. If you have a low and wide aquarium, then the number of fish can be increased, since the water in it is better saturated with oxygen. If you plan to introduce any of the labyrinth fish species, then the population density can also be increased. But if you want to breed goldfish, then it will be more comfortable for them if there is more water for each individual, since they produce a lot of waste.

If the fish are inactive, then one pet requires less water than active, many moving fish.

Filtration and the presence of a compressor also affect the number of fish in the aquarium. If you have all the necessary equipment, then the number of fish can be increased, since the water in such an aquarium is purified and the air is saturated with oxygen.

The shape of the aquarium is important. Many people prefer round aquariums. Indeed, they are beautiful and fit well into the interior. However, it should be borne in mind that not all of them can be equipped with the necessary devices. For example, a small round aquarium, about 5 liters in size, made in the form of a glass, is not very suitable for permanent residence of fish. It is best used for temporary jigging.

In general, fish species such as catfish, cockerels, and lalius are best suited for round aquariums. The density of their settlement must be taken into account based on the characteristics of the fish. In addition, do not forget that the aquarium contains not only fish, but also soil and algae. Thus, it is necessary to subtract 10-15 percent from the volume of the aquarium, and only then calculate the number of individuals.

Schooling fish require more water and should be kept in large aquariums. Aggressive fish also require a lot of space.

When populating an aquarium, try to have inhabitants of all layers.

It is easy to determine them: if the mouth is turned upwards. the upper layer is located exactly. the middle one, looks down. the lower.

Considering all these recommendations, you can create a real ecosystem in your apartment, in which all its inhabitants will be comfortable.

Types of fish that live without oxygen

I would like to note that there is not a single living creature that can continue its life without air. However, among aquarium fish, there are representatives that can not breathe oxygen dissolved in aquarium water, but receive it from the atmospheric air. Macropods, loaches and labyrinths are able to grab air from the surface of the water and keep it in their body for some time.

Loaches can draw air into the intestines. One of the brightest representatives of such fish is the corridor catfish. These are small fish about 3–7 cm in size. On their backs there is a shell of bone plates. The most common color is olive gray. These are peaceful fish that get along well with other representatives. They like to hide in shelters, they often dig out the ground in which they look for food for themselves.

There are about 150 types of corridors. The most common are such as golden, speckled, panda, shterba, adolfi, leopard, venezuela.

The average life span of this species of catfish is 10-12 years.

Macropod and labyrinth fish species have a special gill arrangement, which also allows them to swallow air from the surface. Consider the most unpretentious and common representatives.

How long can they live without air

In the previous section, we found out that no living organism can exist without air.

If the inhabitants of your aquarium are representatives of the species discussed above, then you do not need to worry. They are adapted to living in water without aeration.

However, there are many fish that need oxygen in the water or they will not survive. Sometimes it can happen that the light is turned off, the devices in the aquarium do not work. A natural question arises. how much can such fish withstand without air.

There is no definite answer here. It all depends on the population of your aquarium, the presence of vegetation in it.

If the water norms for one fish are respected, the aquarium is not overpopulated, there are live plants in it, then we can say with confidence that the fish will definitely live for several hours.

Living algae produce oxygen, which, although to a lesser extent than special devices, saturates the water.

Lyalius

Small fish, about 7 cm in size. Shy, it is best to start in a flock of at least 3 fish. They can even live in a small aquarium with a volume of about 10 liters. However, for comfort, it is better to buy a larger container. They get along well where there are a lot of algae, vegetation, because they like to hide.

It is not recommended to place the aquarium in a noisy and brightly lit room, as these fish are afraid of loud sounds and harsh light. They are unpretentious in food.

Macropods

Hardy fish that can live even in a three-liter jar. They tolerate cold and tainted water. Macropods are pugnacious, do not like smaller neighbors. They are unpretentious in food, omnivorous. For the soil, it is better to use expanded clay, coarse sand.

It is not recommended to place narrow decorative elements in the aquarium, as the fish can get stuck and die.

The aquarium should have a lid that does not block the access to air. In addition, it would be ideal if the surface of the water is covered with algae.

What fish and how long can live without oxygen and a filter?

Many aspiring aquarists are looking to reduce their financial costs for setting up an aquarium. Indeed, equipping an aquarium with aeration and a filter requires a certain amount of money. In addition, these devices must be looked after, cleaned in time so that they do not fail. In this regard, many are faced with the question of whether there are fish that can live without oxygen.

Common pinch

This fish is called a home barometer because its restless behavior predicts the onset of bad weather. They are unpretentious, they can live in an aquarium from 10 liters. There are also no special requirements for the temperature, it can range from 3 to 30 degrees. The soil can be both large and small. Sharp aquarium decorations are not recommended.

In general, there are many fish that do not need to equip the aquarium with a filter and aeration for their life. Consider the size and nature of the pets, as well as the temperature of the water, the quality of the soil, and then the fish will comfortably coexist together.

Acanthophthalmus

A loach fish, outwardly similar to a mini-snake or a large yellow worm with a black stripe. The family is carp. The preferred temperature is about 25 ° C.

It uses atmospheric air as oxygen enrichment, which passes through the intestines. In addition, acanthophthalmos are able to absorb oxygen through the skin. To carry out skin respiration of this fish, there must be oxygen in the water.

But just a filter, the release of which is directed to the surface, is also suitable. Thanks to this filtration mechanism, the water will be enriched with oxygen.

Common pinch

Restless behavior will indicate impending bad weather. Unpretentious:

  • a reservoir with a volume of 10 liters is suitable for reproduction;
  • no sharp decorations;
  • use coarse and fine soil;
  • temperature range from 3 to 30 degrees;
  • food is standard. Suggest. plucking will show what you like.
  • harmless fish prefers the same neighbors.

Common pinch

The choice of unpretentious pets for breeding, especially in round aquariums without filtration, aeration is extensive. Beginners need to pay attention to the volume, water temperature, quality, quantity of feed. It is important to take into account the compatibility of future pets, to provide a safe access to atmospheric oxygen.

Fish that definitely need a filter and oxygen

There is confusion that barbs and goldfish can also live without a filter and oxygen, but this is not the case. For them, additional equipment is needed (filter, compressor)!

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Barbs are suitable for small tanks, especially dwarf.

But goldfish in small or round aquariums will live much less than the time given by nature, even with increased care.

With filter

Loach and tropical catfish are able to draw air into a special part of the intestine. The sacgill catfish and Clarius use the supragillary cavities for breathing. These amazing animals can live for a long time not only without oxygen, but also without water. In nature, they move in this way from one reservoir to another.

The most popular among aquarists are bottom catfish, for example, speckled catfish. Usually they serve as “orderlies” of household ponds, removing food debris. But, like bottom dwellers, they contribute to the raising of suspended matter from the bottom, muddy the water. In an aquarium densely populated with catfish, filtration is necessary.

Most fish use cutaneous respiration. For inhabitants of stagnant bodies of water with warm water, this figure can reach 80% against the usual 10–20%. Young growth is even less demanding for aeration. These are catfish, eels.

Fish that need a filter but can do without aeration include:

7 types of fish that can live without oxygen and a filter or with an open aquarium

In the article I will consider which types of aquarium fish to choose for breeding in a reservoir and which ones can live without a filter and compressor. I’ll tell you what allows labyrinths, macropods and loaches to live without additional oxygen supply, how they can survive with an open aquarium. I will list the most unpretentious, hardy representatives of the designated families.

I will consider the features of their disposition, behavior, diet. I’ll tell you who gourami, lalius, cockerels and others get along with. I will let you know which neighborhood is unacceptable.

The respiratory apparatus of the listed aquarium inhabitants is arranged in a special way. The intestines (loaches), the gill labyrinth (macropods, cockerels, etc.) are adapted to swallow air from the surface of the water, to hold it for a while.

Acanthophthalmus

Acanthophthalmus, a loach family, deserves a caregiving effort. Striped snake pets are distinguished by a peaceful disposition and a passion for solitude.

They know how to stand up for themselves. They have a sharp thorn under the eye. It is convenient for her to pave the way in sand, soft ground. An irreplaceable defensive weapon. Predators pierce the stomach, sometimes rip open the stomach, get out.

  • feel comfortable in small reservoirs;
  • it is necessary to provide shelters in the form of snags, stones, castles;
  • they do not need a special diet. microorganisms from the soil, waste from the rest of the population, are suitable. Indulge in live, frozen treats;
  • can jump out. a cover is required;
  • breeding is complex, subject to a professional;
  • get along with almost everyone.

Labioses

This representative of the labyrinth is often mistakenly referred to as gourami, calling them honey. But still, this fish is called labiosa of the genus Trichogaster (until 2017, the genus Colisa).

The similarity with gourami is very strong, both externally and in conditions of detention. But they usually grow larger, up to 9 cm.

The aquarium, which contains labiosa, must be equipped with a “cover”, that is, close the top to prevent them from jumping out of the “house”.

It is believed that the lid is also needed to maintain the microclimate above the water, so that the fish does not catch a cold while absorbing oxygen.

How to make up for a lack of oxygen

Quite often, a lack of oxygen occurs due to the treatment of phenotypes. When drugs and drugs for infection are introduced into the liquid, the temperature of the water rises, and the amount of air decreases. In this case, professionals advise novice aquarists to install an aerator and filter in the tank to make up for the lack of air. They will not only fill the water with oxygen, but also stabilize carbon dioxide, clean the aquarium of impurities, organic residues and harmful substances.

The second way to eliminate the lack of oxygen is to plant living vegetation. As many aquarists know, live mosses and ferns contribute to the saturation of the aquatic environment with air by absorbing carbon dioxide.

Fishes that survive without oxygen These Fish Do not Need extra Oxygen in Aquarium

Macropods

Macropods are labyrinth fish 8-10 cm in size. In nature, they inhabit stagnant water bodies of Southeast Asia. Fish have large elongated fins; the sides have a pattern of blue and red vertical stripes.

Macropods are one of the most aggressive labyrinth fish. They are kept in groups of 1 male and several females. Macropods are unpretentious and hardy, they can be kept in an aquarium without a filter or heater. These fish can live without oxygen and tolerate temperatures from 15 to 26 ° C without harm to health. If kept without a filter, water changes must be carried out regularly.

Catfish

Popular fish for aquarium lovers. There is an opinion that catfish do not need air, but this is not entirely true.

There are species that absorb oxygen from the atmosphere, there are catfish that do not need high oxygen enrichment. For example, speckled catfish have intestinal respiration, extracting oxygen from the atmospheric air.

Ancistrus, pterygoplichta, and other L-catfish require good oxygen enrichment, while tarakatums and otoncycluses can cost a small amount of h3O.

Catfish live in the lower layers of water bodies. Constantly cruising along the bottom and turning the soil, they raise the dregs from the bottom. A filter pump in an aquarium with catfish will provide not only filtration, but also enrichment of water with oxygen.

Aquarium fish species that do not require oxygen

The question of what fish can live without oxygen is incorrect. All living organisms need air. And aquarium fish will not survive without oxygen. And there are no species on the planet that can do without oxygen.

However, there are fish that are adapted to inhale atmospheric air in water with low O2 saturation. Such species, when living in nature, prefer stagnant reservoirs. Fish that do not need oxygen dissolved in the aquatic environment have specific respiratory organs. intestinal cavities or gill labyrinth.

Ordinary fish absorb oxygen molecules scattered in water, for this they use gills. The branchial slits located on both sides of the head have 4 or 5 paired arches. Water flows through the gills, supplying oxygen to the body, taking carbon dioxide.

But some species are endowed with a cunning respiratory system. Which fish do not need oxygen in the aquarium:

  • Adapted to draw air into the swim bladder (as polypterus is a representative of the ancient Mnogoperov family).
  • Possessing intestinal breathing (these are some catfish and loaches).
  • Having a branchial labyrinth. an organ that absorbs oxygen from the atmosphere (such as a ctenopoma).

Representatives of the latter group are called labyrinth fish. They live well without a compressor, but if the owner closes the aquarium with a lid, blocking the penetration of atmospheric air, they will die.

If you choose a tank without a filter and aeration, then cleaning and maintenance of it should be more thorough. The water is changed 2 or 3 times a month. Take 30% of the liquid, pour in clean and necessarily settled water for 2 days. It is impossible to use the liquid without settling, this will lead to the death of the fish. They also regularly clean the soil with a siphon, control the number of individuals so that there is no overcrowding.

Below is a list of what fish can live without oxygen and filter.

Types of fish that live without oxygen

I would like to note that there is not a single living creature that can continue its life without air. However, among aquarium fish, there are representatives that can not breathe oxygen dissolved in aquarium water, but receive it from the atmospheric air. Macropods, loaches and labyrinths are able to grab air from the surface of the water and keep it in their body for some time.

Loaches can draw air into the intestines. One of the brightest representatives of such fish is the corridor catfish. These are small fish about 3–7 cm in size. On their backs there is a shell of bone plates. The most common color is olive gray. These are peaceful fish that get along well with other representatives. They like to hide in shelters, they often dig out the ground in which they look for food for themselves.

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There are about 150 types of corridors. The most common are such as golden, speckled, panda, shterba, adolfi, leopard, venezuela.

Macropod and labyrinth fish species have a special gill arrangement, which also allows them to swallow air from the surface. Consider the most unpretentious and common representatives.

Fishes That Survive Without Oxygen, These Fishes Don’t Need Extra Oxygen In Aquarium

Gourami

Peaceful fish, about 5-12 cm in size. There are a lot of varieties: pearl gourami, moon, blue, kissing, grumbling, marble, gold, chocolate. The names of the species speak for themselves. these fish are varied in color.

They are very unpretentious in keeping, peaceful in relation to other inhabitants of the aquarium, playful fish. A good option for the beginner aquarist.

Of the general recommendations, I would like to highlight the following. The aquarium must be at least 50 cm long and at least 50 liters in volume. Fish need space for cover and play. They are unpretentious in food, eat different types of food, however, it is important not to overfeed them. They need floating plants to spawn.

Lyalius

Another representative of aquatic life that does not need additional aeration. This is a small, bright fish, with a labyrinth respiratory apparatus, belonging to the family of macropods.

Does not require special care, food and maintenance is not whimsical. If a filter is installed in the aquarium, Lalius will feel more comfortable.

The aquarium cover will prevent the inhabitants from jumping out of the aquarium. And if the lighting is built into the lid, then the plants will grow more actively, and therefore create an additional diet for the fish and a favorable microenvironment.

Labioses

This representative of the labyrinth is often mistakenly referred to as gourami, calling them honey. But still, this fish is called labiosa of the genus Trichogaster (until 2017, the genus Colisa).

The similarity with gourami is very strong, both externally and in conditions of detention. But they usually grow larger, up to 9 cm.

Labioses do not need an aerator, since they process the air with a labyrinth apparatus, extracting oxygen from the atmosphere. Given this feature, the fish often lives in the upper layers.

The aquarium, which contains labiosa, must be equipped with a “cover”, that is, close the top to prevent them from jumping out of the “house”.

It is believed that the lid is also needed to maintain the microclimate above the water, so that the fish does not catch a cold while absorbing oxygen.

With filter

Loach and tropical catfish are able to draw air into a special part of the intestine. The sacgill catfish and Clarius use the supragillary cavities for breathing. These amazing animals can live for a long time not only without oxygen, but also without water. In nature, they move in this way from one reservoir to another.

The most popular among aquarists are bottom catfish, for example, speckled catfish. Usually they serve as “orderlies” of household ponds, removing food debris. But, like bottom dwellers, they contribute to the raising of suspended matter from the bottom, muddy the water. In an aquarium densely populated with catfish, filtration is necessary.

Most fish use cutaneous respiration. For inhabitants of stagnant bodies of water with warm water, this figure can reach 80% against the usual 10–20%. Young growth is even less demanding for aeration. These are catfish, eels.

Fish that need a filter but can do without aeration include:

  • aquarium catfish;
  • acne;
  • loaches.

Lack of oxygen

No matter how unpretentious the fish that live without additional enrichment of water with oxygen, they can also suffer from a lack of it. Critical air in water for each type of underwater inhabitants is different.

  • rapid breathing, “protruding” gills;
  • fish swim from above and swallow air;
  • even bottom fish often swallow air above;
  • decreased activity of pets;
  • over time, the brightness of the color decreases, resistance to diseases, growth slows down.

The oxygen consumption of the fish in the aquarium increases after feeding, when the water temperature rises, at night, especially in the presence of dense vegetation. All aquatic plants absorb oxygen at night.

The most effective way to save fish suffering from oxygen deprivation is to install a compressor with an air stone. The air stream dissipates, then rises to the surface, stirring the water and saturating it with oxygen. In a small aquarium, the compressor may not be stationary, but temporary in order to preserve the decor. It is enough to connect it for 40 minutes a day (or if necessary) and clean it up until the next time. At the same time, you must not take tap water! She must be settled.

If temporary measures do not help, stationary equipment is required to supply oxygen to the aquarium. a compressor and a filter. The filter is needed to purify water from organic matter, the decomposition of which absorbs a significant part of oxygen. The power and type of filter depends on the volume of the tank. an external filter is required for a 500-liter one, and an internal one is enough for a 50-liter one.

What fish can live without aeration (oxygen)

Some fish, which do not need a high oxygen content in the water, are able to use atmospheric air for breathing, due to the presence of special organs or another method (gill labyrinth, intestinal or skin respiration).

Many fish will survive without an artificial supply of oxygen, but only with an open aquarium! Without access to air, fish with additional respiratory organs die. Therefore, the surface of the water should not be completely covered with plants.

There are aquarium fish that can do without oxygen.?

No matter how diverse the fish are, they cannot live without oxygen. This concept does not mean the lack of breathing, but the ability to live in water with low oxygen. In nature, these are stagnant waters of swampy areas, rice fields, and enclosed bodies of water. Similar conditions occur in small aquariums without filtration and aeration systems. Only unpretentious fish are suitable here.

The necessary conditions

Aquariums without filtration and aeration require more careful maintenance, including:

  • initially competent selection of pets, taking into account species characteristics (aggressiveness, size, living conditions);
  • regular cleaning with a siphon;
  • partial water change every 2-3 days;
  • tight control of the number of inhabitants to avoid overpopulation;
  • timely thinning of the aquarium flora to prevent overgrowing of the home reservoir;
  • close observation of the condition of pets for the timely detection of problems and diseases.

Without a filter

These are creeper or labyrinth fish, which during evolution have developed additional labyrinthine bony plates with folds of mucous membranes, thanks to which they are also able to use air for breathing in an aquarium without oxygen. Aeration is not necessary for these fish.!

  • cockerels (fighting fish, betta);
  • all gourami;
  • ctenopoma;
  • macropods (paradise fish);
  • swordsmen;
  • lalius and others.

Schooling fish require less volume per fish. Undemanding to the guppy’s habitat. A flock of 6 can be kept in 40 liters with multiple neighbors.

Once a week it is necessary to change the water and siphon the soil!

Fish that definitely need a filter and oxygen

There is confusion that barbs and goldfish can also live without a filter and oxygen, but this is not the case. For them, additional equipment is needed (filter, compressor)!

Barbs are suitable for small tanks, especially dwarf.

But goldfish in small or round aquariums will live much less than the time given by nature, even with increased care.

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