Skin inflammation and congestion
(1) Etiology: Most of the sick fish are old fish over one year old and koi fish. Late spring and early autumn are popular seasons, which can cause a large number of fish deaths. It is most popular when the water temperature is 20~30 degrees. When the temperature is below 20 degrees, several sick fish will still die. This temperature range is also the peak season for fish growth, so it is very harmful. When the temperature drops to about 10 degrees, fish diseases no longer occur, and this law can be used to control the temperature of sick fish.
(2) Symptoms: the skin is red, swollen and hyperemia, which is more common around the orbit, gill cover, abdomen and tail handle. Sometimes there will be congestion at the root of the fin, and in severe cases, the fin will break. The scales of diseased fish are usually intact and have not fallen off. Sick fish float on the water meter or sink at the bottom of the water, swimming slowly, being slow to respond and having poor appetite.
(3) treatment:
# Soak fish with 20 mg/kg furacilin or furazolidone. Soak for 20-30 minutes when the water temperature is below 20 degrees; When the temperature is 2 1~32 degrees, soak it for 10~ 15 minutes for prevention and early treatment.
When the concentration of # furacilin or furazolidone is 0.2~0.3MG/KG, it can be increased to 0.5~ 1.2MG/KG for prevention and early treatment.
# Soak the fish with erythromycin 2~2.5MG/KG at a water temperature below 34℃ for 30~50 minutes, once a day/kloc-0, for 3~5 consecutive days, until the condition improves.
# Inject streptomycin or kanamycin, and then inject 120000 ~ 150000 international units per kilogram of fish. Usually only 1 injection is given, and the patient can get the second injection on the fifth day when he is seriously ill.
# Take norfloxacin orally, and take 0.8~ 1.0G powder every 10KG fish once a day for 6 days.
# Dip and wash with Rivanol 20MG/KG, when the water temperature is 5~20 degrees, dip and wash 15~30 minutes; Soak at 2 1~32℃ for1~15 minutes. Used for early treatment, the effect is remarkable.
The concentration of # rivanol is 0.8~ 1.5MG/KG, which has special effects.
# Using the above treatment method and taking salt water bath at the same time, the effect is remarkable.
(4) Prevention:
# Reasonable intensive culture, keeping the dissolved oxygen in water at about 5 mg/L. ..
# Strengthen feeding management to keep the water fresh.
# Spray furacilin or furazolidone regularly to prevent diseases.
Erythroderma (hemorrhagic corruption)
(1) Etiology: Erythroderma is caused by Pseudomonas fluorescens. Fish are injured and prone to this disease. Spring and autumn are popular seasons, which will cause a large number of fish deaths. This disease is closely related to water quality, and it is easy to occur when dissolved oxygen is low and organic matter content is high.
(2) Symptoms: the skin of the diseased fish is partially or mostly red and swollen or congested, the dorsal fin, caudal fin and other fins are congested at the base, the fin ends are rotten, and the mouth and muscles are normal. Scales of diseased fish fall off (different from skin inflammation and congestion), especially on both sides and abdomen of fish.
(3) Prevention and treatment: same skin inflammation and congestion.
Vertical scale disease (loose scale, vertical scale)
(1) Etiology: Squamous disease is caused by Pseudomonas punctata, which mainly harms koi fish, a large individual fish. It is the popular season from late autumn to the following spring when the water temperature is low.
(2) Symptoms: The diseased fish has rough body surface, erect scales and loose spherical appearance. In severe cases, exophthalmos, shortness of breath, back somersault and even death. The scales are swollen with transparent or bloody exudates. If you put a little pressure on the scale, the liquid will come out of the scale. The sick fish sank to the bottom of the water or lost its balance, its abdomen swelled, and finally died of exhaustion.
(3) Treatment: Just like skin inflammation and congestion, it will be better to soak in salt water.
(4) Prevention:
# Prevent fish from getting hurt.
# Parent fish spawning pond should be aired in winter and disinfected with quicklime or bleaching powder.
# Add 5% crude chlortetracycline or oxytetracycline to the feed.
# Take vitamin E orally. The weight of fish per 10KG per day is 0.3~0.6G, and it is increased to 0.6 ~ 0.9G( 10 ~ 15 days) for long-term use as an adjuvant treatment.
Spotted subspecies
(1) Etiology: Printing disease is caused by Aeromonas punctata, which is mainly caused by improper operation, resulting in fish injury and infection. Late spring to autumn is the popular season, which mainly harms big fish over one year old.
(2) Symptoms: The lesions are often located above the body-side gluteal fin, on both sides near the anus, and rarely in the front of the body. At first, the skin became inflamed and erythema appeared. With the development of the disease, scales fall off, muscles rot, lesions are round or oval, and there are bleeding and redness, which seems to be marked with red marks. In severe cases, the muscles in the focus often rot through, and bones and internal organs can be seen. The sick fish lost weight, lost appetite, swam slowly, and eventually died of exhaustion.
(3) Prevention and treatment: The same skin inflammation and congestion, and the effect of applying potassium permanganate solution to the affected area is remarkable.