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Why die fish

maintenance, care, compatibility

Aquarium fish can die for various reasons. The most common are drastic changes in water parameters, disease, and body wear.

The detrimental level of oxygen in the water affects the health of the fish. In this case, the fish are at the surface of the water, and capture the air.

If the problem is not solved in time, the pets will die. Unfortunately, there are a number of reasons why domestic fish can die.

The level of oxygen in an aquatic environment depends on the temperature of the water (in warm water, a low concentration of dissolved oxygen), chemical indicators, a bacterial film on the surface of the water, outbreaks of ciliates and algae. To solve the problem will help water renewal, intensive aeration.

Fluctuations of the surface layer of water play a leading role in the gas exchange of a closed space.

  1. Water of inadequate quality (dirty, turbid, toxic). The likely cause of death is poisoning with nitrogenous compounds that are formed after the collapse of fish waste. Improper water purification leads to the fact that nitrites, nitrates and ammonium as toxic substances quickly spread in the water. The correct nitrogenous cycle is a guarantee of the health of all pets. But if the water is poisoned by nitrogenous compounds, it becomes turbid, the smell of rot will appear. The dissolved ammonia can be in a reservoir in high doses at a pH level of 7.5 and above. At lower pH levels, ammonium is not so toxic, but it can harm small fish. Fish die from poisoning with this substance.

Wrong conditions of the settlement of fish, too fast adaptation. Water in a pet store and in a home tank can vary in many ways. If the fish instantly settle into the water of a different pH level, hardness, temperature, with a difference of one unit and more, then they die within 24 hours or one week.

It is advisable to take water from the store aquarium in a portable package, and pour it into a separate container. It is necessary to add water from the main reservoir in portions, not more than 5% of the total volume, at intervals of 10 minutes.

Fish can be transplanted into the aquarium after the part of the aquarium water in the tank becomes higher than 60-75% of the total volume.

See how to properly transplant aquarium fish.

Gas embolism is a disease that can lead to the sudden death of a fish. On the eyes, the body can be seen capillaries, the body turns red, the fish swims from corner to corner, the body is covered with air bubbles, the scales are tousled.

The disease is the result of a sharp replacement of water (more than 50%), or the settlement of the pet in the water, recruited directly from the tap.

  • Illness is another reason why fish die. Often the symptoms of the disease are visible immediately by the behavior of the fish and its appearance. Diseases are the result of a weak immune system, stress, infection. Without solving problems with water, even drugs do not always eliminate the problem. Some treatments may not be suitable, and may lead to poor health. For example, salting water for medicinal purposes is impossible if the fish are poisoned by nitrates. Therefore, if you buy a new fish, leave it for a 2-4 week quarantine so that it probably does not bring the disease to the general aquarium. After quarantine, healthy fish can be launched to other fish.
  • What to do if you find a dead fish in the walls of the aquarium?

    Why fish die in an aquarium :: why fish aquarium die :: Other pets

    The causes of death of aquarium fish can be many. Ideally, the environment in the aquarium should be as close as possible to the natural habitat of the species of fish that you settled in it.

    If there are any deviations, it can lead to health problems and even the death of your pets.

    Question “Snowy turtles.” – 3 answers

    Aquarium fish should be provided with perfectly clean water, the aquarium itself should be well lit and filtered. And, of course, we must not forget about feeding and live plants.

    It would seem that to fulfill these requirements is quite simple, what can go wrong? Most often the fish die as a result of the following violations.


    The first reason – poor-quality water. If you do not clean your aquarium often enough, then the waste products of the fish disintegrate and poison the water with nitrogen compounds. During the day, the fish accumulate a huge amount of feces – up to a third of its weight.

    In addition, do not overfeed your pets, otherwise the uneaten food will begin to decompose. Unfortunately, many novice aquarists are poorly oriented in such matters and completely forget about timely cleaning. Nitrogen compounds, such as ammonium, nitrate and nitrite, make themselves felt unpleasant smell and muddy
    The second reason is the wrong adaptation of the purchased fish to new conditions. The problem is that the water in pet shops aquariums and the water in your home can vary dramatically in terms of pH, temperature, hardness.

    You can not just take and throw a newly acquired fish in your tank, it can experience shock. It is necessary to attach a bag with a new fish to the glass of the aquarium, install weak aeration and pour aquarium water into the bag every 10-15 minutes.

    After an hour and a half, the water from the package can be poured into the sink, and the fish run into the aquarium. In the aquarium for a better adaptation of new fish, it is desirable to add a special anti-stress drug


    The third reason is quite common – various diseases. But It is worth noting that the disease option should be considered only when the possibility of contamination or maladjustment is excluded.

    And here it is necessary to make a reservation that the fish get sick because of the reduced immunity caused by adverse conditions. If one fish has died, or the sea has begun, you need to consult with a specialist who is not interested in selling expensive drugs.

    For the prevention of disease, take care of the fish, and place the diseased and recently acquired imported animals into quarantine.
    Finally, you should list the adverse factors that may adversely affect the health of your fish, which can lead to death. These factors include tap water, a heater that broke down in winter, a lack of oxygen, and finally, aggression from other fish.

    It is very unpleasant when the fish begin to die in the aquarium. It would seem that everything was done correctly: clean water was poured, aquarium equipment was working, the fish received timely feed.

    Despite this, the animals die. Unfortunately, this situation occurs in newcomers of the aquarium business quite often, which is why it is necessary to arm yourself with knowledge of the causes of this phenomenon.

    Each novice aquarist should understand the following in advance: if conditions are created in the water house for its inhabitants that are as close as possible to their natural habitat, then they will not get sick, much less die.

    At the very least, the risk of death will be minimized.

    Practice shows that in the overwhelming majority of cases, the death of fish is caused not by any external diseases, but by errors in content, illiteracy and carelessness of their owners. There are various reasons for this unfortunate phenomenon or a whole combination of causes and factors that should be considered in detail.

    We are talking about nitrogen compounds, which include ammonia, ammonium, and other nitrates. These toxins will inevitably be present in the aquarium, as the fish every day leaves a lot of waste, which is constantly decomposed.

    Thus, the visual purity of water is often accompanied by the appearance of an unpleasant smell of rot, which indicates a high concentration of toxic nitrogen compounds.

    This smell is especially clearly felt if the aquarium is overcrowded and the system of biological water purification does not cope with the processing of toxins. As a result, the fish begins to gradually get poisoned and subsequently dies.

    This state of aquarium water is formed in the following cases:

    • in the new aquarium has not yet reached the ecological balance;
    • beneficial bacteria that process toxic nitrites into neutral nitrates are not yet at full capacity;
    • new fish have been added to a working balanced aqua system;
    • overpopulation of the aquarium;
    • biofilter failure;
    • improper maintenance and cleaning of the biofilter, resulting in the destruction of the colony of beneficial microorganisms.

    On this basis, certain measures are taken to prevent water poisoning. It can be either a substitution of part of its volume, or the installation of a new biofilter, or the relocation of extra fish.

    Even if a large fish is considered a herbivore, it can easily eat small animals that fit into its mouth. For many inhabitants of the domestic water reservoir, the degree of aggression repeatedly increases during the spawning period.

    There are aggressive fish because of their natural features, whose bites and bumps are very painful. All of these factors can also cause the death of aquarium pets.

    When buying a fish you should not rely entirely on the opinions of sellers. As a rule, for them the most important is the fact of sale.

    It is better to spend time and learn more about the compatibility of certain species even before going to the pet store. Thematic information on this subject on the Internet is quite enough.

    This is true, but in this case it is necessary to distinguish two main factors.

    First of all, The disease can occur as a result of all the reasons listed above. Any of them, if they do not kill the fish immediately, will contribute to a sharp decrease in immunity.

    It is on this basis that a disease can develop that can lead to death. If this happens, then pets should be treated by contacting specialists.

    Secondly, fish death can be caused by the development of infectious diseases. This is the worst scenario that could be in the process of maintaining the aquarium.

    Why do infectious diseases appear? As a rule, there are two main reasons: the launch into the aquarium of already infected fish or the appearance of parasites in the water house.

    Fungal diseases, peptic ulcer disease, lepidorthosis, tuberculosis and many other infections can cause not only the death of an individual, but also the pestilence.

    It is necessary to daily monitor the behavior of aquarium pets, carefully examine them, and in case of the slightest suspicion, move the diseased individual into quarantine and consult a specialist.

    Unfortunately, at least once the fish die in almost every aquarist. And the reasons may be completely different. It is important to carefully analyze the incident, identifying a specific cause, and try to prevent its recurrence.

    And if there is not enough knowledge and experience, there is the Internet and advice from experienced owners of ornamental fish.

    The death of pets is always a sad event for the owners, even for those who contain only fish. Especially when they start dying one after another.

    Let’s try to figure out why the fish die in the aquarium.

    The first and most common reason that fish die one by one is water quality. Perhaps it has not changed for a long time, and harmful microorganisms have developed there, or, conversely, before the change the water did not settle well or had a temperature much higher or lower than necessary.

    To eliminate this cause, you should immediately change the water in the aquarium.

    Feed quality may also affect the fact that the fish began to breathe. Food may be expired or unsuitable for the type of fish you are keeping.

    Another factor important for fish is lighting conditions. They should be optimal and as uniform as possible.

    Fish can begin to breathe even in a new aquarium. The reason may be that the stores often wash aquariums, to give them a more presentable appearance. And it is not known which ones detergents used for this.

    Therefore, if the fish began to die in the new aquarium, they should be immediately removed to another tank, and the aquarium should be thoroughly cleaned.

    The reason why fish aquarium die can be disease, listed in the aquarium. And she can get there in different ways.

    For example, with insufficiently purified water, but more often it penetrates with another, already infected fish. This can happen if you recently purchased and put a new pet in the aquarium.

    Particularly increases the risk if you want to keep ornamental fish and fry caught in local water bodies in one tank. To avoid contamination of fish from a new one, you need to put each fish you just bought before going to the aquarium in quarantine, a separate container for several days.

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