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Die fish in the aquarium

maintenance, care, compatibility

  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?

    1. Look at the number of fish in the tank. Recount them in the morning and in the hours of feeding. What is their condition, do they take food well? Are there fish that refuse food? Is it possible bloating in one of the fish? If you have not found any fish, check all the corners in the aquarium by lifting the lid. Inspect the plants, caverns and all the scenery. If after a few days the dead fish did not float to the surface, it may have suffered from a neighbor in the aquarium, and you can hardly find it. Sometimes the fish fall into an unprotected filter, and die there. In any case, keep searching until you find the visible reasons for the disappearance.

  • Fish that have died in an aquarium should be removed from it. Tropical species of fish quickly rot because of high water temperature. Under conditions of such an environment, bacteria multiply rapidly, water grows turbid, and an unpleasant odor appears, which can cause infection of other pets.
  • It is necessary to do inspection of the dead fish. You must understand why she died in an aquarium. Wear medical gloves. If the body is not completely decomposed, look at the condition of the fins, scales, and condition of the abdominal cavity. Perhaps there are wounds on the body or signs that she has suffered from unproductive neighbors. If the stomach is strongly swollen, eyes bulging, the scales are covered with bloom or stains – it means that the pet has suffered from illness or poisoning. After inspection, gloves should be discarded.

    Check the water parameters. Water is often the main cause of poor health. Take tests with indicators, and make the necessary measurements.

    The increased content of ammonia and nitrates in water, heavy metals leads to the fact that pets die quickly. If the aquarium has a decorative element made of iron, zinc, copper – this is another pointer.

    Some fish do not tolerate metal, and suddenly die.

    Watch a video on why water tests are needed and how to use them.

    After the test results, draw conclusions. The test will show two results – either you have everything in order in the aquarium, or the water is dirty and there is an overabundance of toxic substances in it.

    In the second case, you need to enable powerful filtering, and make a replacement of 25% of the aquarium water for clean and infused. Dramatically change the parameters of the water is not necessary, it can harm living fish.

  • But if the water is in proper condition, there may be a number of other reasons why the fish died. Sometimes aquarium pets die of hunger, overeating, illness, severe stress, bruises after attacking other fish, age. If the fish die suddenly, you need to do everything necessary to keep others alive. Contact your veterinarian if you do not find obvious causes of death of the pet.
  • Why do fish in aquarium suddenly start dying?

    No one wants to blame himself, so beginner breeders blame the disease. Unscrupulous sellers only reinforce their doubts, because they have a goal to sell expensive medicine and cash in on.

    However, do not rush for a panacea, carefully examine all possible causes of death.

    Blame the disease is possible only if the symptoms have been noted for a long time. The fish died away gradually, and not just died in an instant, for no apparent reason.

    Most often, the disease is brought to the aquarium with new residents or plants. Death may occur due to malfunction of the heating element in cold weather.

    Going to pet stores, you should be aware of what exactly you need medicine. Each of the drugs directed to a specific disease. Universal drugs do not exist!

    If possible, consult an experienced aquarist or ask a question on the forum, knowledgeable people will tell you what to do in this situation.

    Of course, the disease can not kill a healthy fish. Why do fish die in an aquarium?

    If the death occurred, then the immunity has already been undermined. Most likely, the first two errors occurred.

    Do not rush to launch new residents, no matter how beautiful they are.

    What to do to protect the aquarium:

    • Organize quarantine for new inhabitants;
    • Sanitize fish or plants.

    What to do if the disease started up in the aquarium:

    • Change one tenth of the water daily;
    • Increase the temperature;
    • Strengthen aeration;
    • Remove the carriers of the disease and those who are clearly infected.

    Remember which fish you ran at home last. Individuals brought from other countries can be carriers of rare diseases, to detect and classify which are sometimes not possible on their own.

    Before you go to the store for pets, think over to the smallest detail, can there be several species in one fish house? You should not rely on the competence of the seller, since the main goal for him is to realize as much of the goods as possible.

    A few fundamental rules:

    • Big fish always tend to eat small ones (even in the case of herbivorous species);
    • Many succumb to intraspecific aggression;
    • Some are able to stick to small neighbors, which ultimately leads to death;
    • The strong always eat the weak;
    • Buy only those fish whose peace-loving nature you are sure of.

    Unfortunately, it is impossible to establish why fish die. The death of a pet can happen even to experienced breeders.

    Be attentive to the fish, and you will definitely notice a change in behavior and in time eliminate the cause of anxiety. More often, fish die in an aquarium because of an oversight, and not according to other criteria.

    Unfortunately, sooner or later aquarium fish die. The most common cause is the wear and tear of the body, as a result – its old age. Life expectancy depends on many factors, but it has been proven that large fish live longer than small ones.

    As for guppies, they belong to small fish, which can grow 5-7 cm in length in an aquarium. Live relatively short: 3-5 years.

    Why are these fish dying in the aquarium?

    Causes of Poecilia reticulata death: water pollution

    Guppies (Poecilia reticulata, Guppy) suddenly die one after another? Then you need to do something to prevent the death of other fish.

    Sometimes razvodchiki go to specialty stores, buy funds or drugs, but nothing helps. If the cause is not found, it will be difficult to eliminate the effect. The main reason for the death of many fish in the home aquarium is poor housing conditions, namely, dirty, inadequate water.

    Poecilia reticulata is no exception.

    Recommended parameters for guppy content: temperature 22-26 ° C, pH 7.0-8.5 pH, hardness 10-18 °. With sharp changes in environmental conditions, the fish will start to hurt. Also, in the absence of weekly replacements of 20% of water with fresh and clean water, guppies will actually breathe their own waste.

    The lack of high-quality filtration and aeration will also negatively affect fish life.

    Watch the video with guppy content recommendations.

    Increased concentrations of ammonia, nitrates and nitrites lead to exhaustion of the fish. They can become poisoned with harmful substances suddenly, if the aquarist does not notice the smell of rot, turbidity of water. What should be done in this case?

    It is important to purify water from impurities with the help of special harmless substances that are sold in stores, or a filter. Completely replace the water should not, but only part of it.

    Another reason why the young guppies in the aquarium do not die in time is the unprepared water. Do not run fish into a tank with chlorine-rich water. She should insist 4 days before pouring into the container.

    You can use dechlorinator, which is sold in some pet stores.

    Pay attention to the state of the filter – on the sponge breeding good bacteria that fight against toxic substances and microbes. The main thing is to timely clean the filter filler and replace it if necessary.

    Disruption of biological balance can lead to a sharp deterioration in the health of fish.

    Over-feeding guppies can also cause them to die. Not eaten feed splits, forming ammonium vapors. If you put the fish on a fasting day, at least once a week, and remove leftover food, you can fix the problem.

    On the day of harvesting, make measurements of the level of nitrates and ammonium, the pH and hardness of water, the level of CO2 and oxygen. If the level of toxic substances is 2 ppm or more, you need to replace 50% of the water, but not immediately, but within a few days.

    Over time, the microflora will recover. You can not use antibiotics to combat ammonia, otherwise you can destroy all the good bacteria.

    Although guppies are considered hardy fish, but under the wrong conditions of the aquatic environment, they can get sick. Diseases are another reason why these fish die in the aquarium.

    The infection enters the water with poor-quality food, sick fish and infected plants, and then rapidly multiplies in dirty water. A terrible infectious disease of guppy is tuberculosis, or mycobacteriosis.

    Unfortunately, it is not treated: the fish must be destroyed, and the entire aquarium is strictly disinfected.

    The parasitic ciliate Trichodina Modesta can cause the disease trichodynia. Treatment of fish is possible with the help of methylene blue, trypaflavin, attorney salt and other medical preparations.

    Most often, fry and young fish die from the disease.

    Long-tailed guppies with veil fins can get the so-called “red scab”. This deformation is visible on the reddish coating on the tail, later its rays will flake off.

    In case of late treatment, the tail will be “eaten”. In this case, you need to do a mechanical trimming of the damaged part of the fin, and add chloramphenicol or salt to the water.


    Acclimatization and improper compatibility as a result of the death of fish

    If newly purchased fish suddenly die in an aquarium, they probably could not adapt to the conditions of their new environment. Water temperature, acidity and hardness of the new aquarium should be similar to those in which they lived before the purchase. Before you run the fish in a common tank, put them in a two-week quarantine.

    The difference in pH and dH by one unit can kill the fish. What should be done in order for guppies to transfer new conditions?

    Place the portable bag with the purchased fish in a new water, pin it to the glass with a pin. You can run a weak aeration aquarium. After 10-20 minutes you can add a little aquarium water to the bag.

    It is recommended to repeat the procedure every 15 minutes. After 1.5 hours, you can release the fish in the otsadnik.

    You can add anti-stress drugs and some feed to the water.

    See how to properly transplant fish in the aquarium.

    Sharp temperature changes in the aquarium should be avoided. Do not make too frequent water changes, and no more than 30% of the total volume of the tank.

    Siphon the soil in a timely manner, remove and process boiled water contaminated scenery.

    What else are killed aquarium guppies? Perhaps a few novice aqurahumists guess about such a problem as the wrong settlement.

    And, most surprisingly, other Guppy can be the cause of death. Unsuccessful settlement implies a close environment, incompatibility of characters, disproportion of the number of males and females in the aquarium.

    If all the males are killed in the kennel, it means that there are too many females on them, or there was a fight between the males in tight territory.


    Choose a spacious 50-liter tank for one fish to settle the guppy. On one male settle 1-3 females. Install reliable shelters, plant plants that would prevent conflict situations.

    Also settle Poecilia reticulate with small, peaceful fishes. Related viviparous fish are their best neighbors (swordtails, mollies and petilia).

    Do not settle the fish with aggressive, fast and predatory fish. It happens that guppies die of stress and physical exhaustion.

    Noticed that the fish jump out of the aquarium, and die right on the floor? Most likely, there is not enough aeration in the water, the fish have experienced a jitter, or the water quality is inadequate.

    To avoid such a problem, check the behavior of all the inhabitants of the nursery, make measurements of the state of the water.

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