Aeromonosis (rubella) in fish appears as a result of infection from newly acquired individuals and uninfected aquarium equipment. The causative agent of the disease is Baterium Aeromonas punktata. Aeromonosis most often affects barbs and guppies. The bacterium enters the body of the fish through damaged skin and gills of the fish. The incubation period is from three to eight days, depending on the temperature of the water. If the water temperature is below 20 degrees, then the disease becomes chronic.
Symptoms of aeromonosis.
In some parts of the body of the fish, inflammations appear in the form of red spots. Aeromoniasis (rubella) can also manifest itself in the form of ulcers, eyebrows, raising scales, abdominal dropsy, and destruction of the anal fin. Fish become weak, practically do not respond to external stimuli, and stay near the surface of the water. The chronic form of this disease lasts from one to two months. With timely treatment, the fish recover, acquire immunity from this disease, but become the spread of the infection.
Treatment of aeromonosis.
Fishes with raised scales and abdominal dropsy should be destroyed, and healthy-looking individuals should be treated in the following ways:
1) 500 IU of bicillin-5 per 100 liters of water daily for a week. The drug is introduced into water overnight, as it decomposes under light. It should be noted that bicillin-5 has a bad effect on some plant species.
2) 200−250 mg of sulfonomethoxin per 1 liter of water.
3) 30-50 mg of erythrocycline per 1 liter of water.
4) 30-50 mg of kanamycin per 1 liter of water.
1) 300 mg of chloramphenicol per 1 liter of water. Excerpt fish for about 12 hours.
2) 800 mg of synthomycin per 1 liter of water. Exposure is 12 hours.
3) 100 mg of methylene blue per 1 liter of water. Exposure is 4-6 hours.
Description of the disease
Aeromonosis is an infectious disease of fish of the carp family. Also called rubella, hemorrhagic septicemia, infectious dropsy.
The disease is caused by bacteria Aeromonas hydrophila. Disease is widespread in Europe, Asia, South America - in those countries where they are engaged in carp farming.
Contaminated fish can be identified. by inflammation and hemorrhage on the skin, buccal eye, general dropsy and redness of the whole body, flaky scales.
Pathogen the infection is tolerated sick fish and their corpses, fish carrying the specified bacteria.
There can be several ways to transmit the disease: direct contact of diseased fish with healthy, indirect contact, in which water and feed with infection, fishing equipment, implements, dishes, waterfowl, blood-sucking parasites (e.g. leeches), uncontrolled transport of fish from fish farms that are unsuccessful become a source of infection diseases of aeromonosis.
Control Measures and Prevention
In cases of detection of carp aeromonosis in fisheries or natural bodies of water there is a need for quarantine measures. In contaminated water bodies, flying or a complex method is used.
For flying, breeding and fishing is completely stopped:
- in the autumn season, water bodies are drained, fish are caught, while conditionally healthy fish are sold for trade, not in contact with farms that are healthy from aeromonosis,
- operation of fish ponds ceases for a year, during which time they are cleaned of sludge, disinfected, frozen and dried,
- fishing gear, overalls are disinfected by boiling or formalin,
- after all the procedures, healthy fish are launched into the reservoirs.
With the integrated method, the following activities:
- breeding ponds,
- workers are attached to dysfunctional reservoirs, carps are treated, ponds are disinfected,
- favorable conditions for fish are being established.
Also treatment and prevention is carried out using various antibiotics, nitrofuran drugs, sulfonamides and methylene blue. The food is mixed with biomycin, chloramphenicol, synthomycin, feed antibiotics, furazolidone, furtin, nifulin, furadonin and methylene blue. Fish are fed with standard granular medical foodor drugs are added to the dough-like food.
Duration treatment is a week: the first five days the fish is given medicinal food in usual doses, then two days - the usual food. The course is repeated twice or thrice during the summer. Fish treated antibiotics and furazolidone, implemented in three weeks after the end of therapeutic measures.
The main preventive measure is to protect safe fisheries from entering pathogens of aeromonosis. For this, transportation of fish for rearing is subject to strict veterinary control. Planting stock imported to farms is placed in ponds separately from local fish, producers and the repair team are quarantined for at least a month, while the average daily water temperature should be above 12 degrees. If the water temperature is lower, quarantine period lengthens.
Is sick carp dangerous for humans?
Aeromonosis does not pose a danger to humans and carnivores. Infected fish that has not lost its marketable appearance and meets the nutritional qualities and requirements, allowed for human consumption without any restrictions.
Fish, which has an unsightly appearance, is fed by farm animals, poultry, fur animals, after boiling it or processing it into fish meal.
Carp aeromonosis, although expressed in unpleasant external symptoms of a sick carp, however not so scaryas it might seem at first glance. Disease treatable, it can be prevented using preventive measures, and most importantly, it not dangerous to humans even if he happens to eat sick fish.