Why do fish get sick? What are the symptoms of fish sickness

<> fish is sick and calls for help.

To summarize the reasons, there are mainly the following: Environmental factors. The relationship between water temperature and fish is not only that the external water temperature changes drastically, and the fish are difficult to adapt and die, but more importantly, the water temperature change is related to the growth and decline of fish disease pathogens.

The amount of dissolved oxygen in the water is related to the growth and survival of fish, the dissolved oxygen in the water is low and gill rot disease is easy to occur, and the dissolved oxygen is as low as 1 milligram liter will flood the pond and die; When there is too much dissolved oxygen, small fry will get bubble disease. The adaptation range of freshwater farmed fish to pH is appropriate, and fish mortality will be caused by a pH below 5 or above. In addition, if the pH is between 5, not only does it not grow well, but it is also easy to be infected with powdering disease.

At pH, the gills secrete a lot of mucus, which hinders the breathing of the fish and causes the fish to suffocate and die. When the environment changes suddenly, the fish will become sick if they cannot adapt to the new environment for a while. The human factor.

If the stocking density is too large or the proportion is improper, it will cause insufficient bait, malnutrition and thin physique of the fish, and various fish diseases will occur and epidemic; Feeding bait is not fresh, uneven bait, sometimes more and sometimes less, full and hungry, or improper feeding time or too much bait, which is easy to cause enteritis in fish; Pond fertilization does not pay attention to the method, and the application of unfermented fertilizer causes bubble disease in fish fry; The transportation of fish or fishing, fingerlings and broodstock if the operation is rough and not carefully managed, often injures the fish body, which creates conditions for bacteria and molds or parasites to invade the fish body, and often infects the fish with diseases such as water mold and bacteria. Biological factors. Pathogenic organisms (microorganisms, parasites) parasitize on the surface and body of fish, absorb nutrients from fish, destroy fish tissues and organs, and affect fish life activities.

Fish diseases caused by microorganisms are called infectious fish diseases; Fish diseases caused by parasites are called parasitic fish diseases. Predators (aquatic insects, frogs, ferocious fish) directly harm and devour fish. Intrinsic factors.

The resistance of the fish itself to disease also varies depending on the species, age and individual nature of the fish. Stocked fingerlings that are not robust and have poor resistance to disease can lead to disease.

Because the quality of the water is not good.

Observe the water temperature first. See if the water temperature meets the water temperature requirements of the fish you are serving. Different species of fish have different water temperature requirements, so don't keep different fish species in the same tank.

If there is a change in the water temperature and the usual serving temperature, find out the reason, whether it is the weather or the failure of the heating system caused by a power outage, and adjust the water temperature to the appropriate temperature in time.

If the water is turbid, replace it as soon as possible. Use water that has been dried in advance, change a quarter of the water in the fish tank each time, and a quarter again the next day. If you really haven't prepared the dried water in advance, you can't directly exchange it with tap water, you can heat and boil the tap water to remove the chlorine in the water, cool it to a suitable water temperature, and then change it into the fish tank, and at the same time use an oxygen pump to add oxygen.

Reason:

First, the fish in the river are wild, and they are fed food every day to look for it, and they train themselves to be strong and ornamental fish during the period of searching for food and chasing food.

It's waiting for someone else to put food with your mouth open. That's why it's important to exercise.

The second is density, the fish in the river are wild because of the food chain.

The impact of Sun Blind is destined not to be too much, ornamental fish belong to farming, the density is very large, and the density is more than the germs will come naturally, and we resist the virus, try not to go to crowded places.

Precautions for fish farming:

1. Don't choose a creative cylinder, it looks good and is not easy to use.

2. Choose the size of the fish tank according to the actual situation, and most of the recommendations of others are only from your own point of view.

3. Disinfection is not necessary, but it is highly recommended, because once there is a problem, the novice will not be able to hold it.

4. The cultivation cycle is about 22 days, even if you use the so-called 15 days to cultivate the nitrification system, don't release the main fish too early. What novices lack is not new ways to play, but to eat the mainstream thoroughly.

5. Don't care too much about the turbidity of the water quality in the opening stage, and test the water quality regularly, as long as the water quality is okay.

1. Appearance symptoms

When a fish gets sick, it tends to show some unusual changes in appearance. For example, white spots, black spots, or red spots appear on the surface of the fish; ulcers or breakages on the surface of the fish; swelling or deformation of the surface of the fish; discoloration of the gills of fish, and so on. These changes may indicate that the fish is sick.

In addition, some diseases can cause fish to swim inflexibly and even be suspended in the water and unable to sink. Some aquatic animals, such as earthworms, daphnia, etc., may also not absorb bait at all.

2. Behavioral symptoms

When fish get sick, their behavior is also affected. Some diseases can cause diseased fish to swim slowly or exhibit abnormal swimming postures; Some fish even stop eating. If there are symptoms such as body surface desquamation and gill hemorrhage, it should be paid more attention.

Once the behavior of the fish is abnormal, it is recommended to observe it in time to determine whether the fish is sick and give ** in time.

3. Bait changes

Changes in bait in the water are often an important indicator of fish disease. If there are pathogenic bacteria or viruses in the water, the fish will be infected when eating, which will lead to abnormal changes and discomfort in the fish's body. If the bait is completely ignored or only partially eaten, it may also indicate that the fish is sick.

When other common symptoms are not obvious, whether the bait changes normally can be an important reference for judging whether the fish are sick.

4. Other symptoms

When the fish is sick, Qingchang may also have some other symptoms, such as abnormal excrement, abnormal breathing, and so on. These symptoms may indicate that the fish has been infected and that the disease is getting worse.

When judging whether the fish is sick, it is recommended to judge it in combination with a variety of symptoms and give ** as soon as possible.

Because the water quality is not good, Yu Cai is always sick.