1, water temperature and water quality problems. The water temperature is generally constant, so there is no problem. This kind of fish has the function of self-purification. As long as it is not particularly mixed, the problem is not big. Generally, it is enough to change the backwater once every three months. Ordinary fish don't need light and heat.
2, environmental factors, the most basic thing is the problem of water, sometimes because of the sudden change of weather, the temperature drops, then the water temperature suddenly drops, which easily leads to fish can not stand it. At the same time, there is water quality, which means that everyone should remember to change the water in time.
3, biological factors, generally speaking, fish are attached to various bacteria or algae when they are bought back, and some biological factors harmful to fish can easily lead to fish death.
4, the problem of the fish itself, like age. Just like people, when fish reach a certain age, their resistance will decline, so they are more likely to get sick, which requires more care from their friends.
5, man-made, such as fish hypoxia caused by power failure in the fish tank, or accidental injury to fish when changing water, leading to bacterial invasion, are often encountered.
Prevention and treatment of fish-related diseases;
1, fin rot
The fin is damaged and discolored, and there is a foreign body in the rotten place, or the transparent fin leaves are white and the white gradually expands; In severe cases, the fins are incomplete or unable to stretch. This disease is very popular in summer. Tropical fins are thin and easy to be bruised and broken. You can choose treatment methods such as salt and antibiotics.
2. Cotton mouth disease
Also known as rotten mouth. White cotton-wool hyphae grow around the mouth of sick fish, which is also called white mouth disease. Fish that eat algae by touching the box wall with their mouths are prone to this disease and infection. Sick fish can't eat, swim slowly and feebly, and die. Timely treatment is necessary. Soak the sick fish with penicillin or chlortetracycline solution, or with 10ppm oxytetracycline solution. Aquariums, fishing nets and tools are soaked in 0. 1% formaldehyde solution for disinfection.
3. Flea disease in anchorage
Also known as echinococcosis; The head of the iron anchor worm drills into the skin and muscles of the fish, and the worm hangs on the fish like a short needle. When the worm is pulled out, an iron anchor-like head can be seen. The affected part is red and swollen with erythema and necrosis, which is easy to be invaded by germs. Sick fish are impatient, lose appetite and lose weight.
4. Oral filariasis
Oral filariasis is parasitic on skin and gills, and there are 1 layer of milky white mucus on gills and body surfaces. Cloudy, so it is also called Baiyun disease. The cheeks are red and the skin is red, swollen and dull. Sick fish have difficulty breathing, swim slowly, lose weight gradually and often die in large numbers.
References:
Baidu encyclopedia-fish