Diseases of pond fish. Aeromonosis (rubella)
Aeromonosis (German measles) is a disease that causes hemorrhagic inflammation of the skin, accompanied by ulceration, and visceral and abdominal dropsy.
Pathogen — Aeromonas punctate. This movable rod with a polar flagellum, is a facultative aerobe. Spores and capsules do not form it.
Ehpizootologicheskaja data. Sick aeromonosis carp, carp, silver and Golden crucian carp, tench, bream, roach, especially under the age of 2 years.
The disease is widely distributed in fish farms European countries, the USA, and also in the CIS and the Russian Federation. It usually occurs in the spring and summer (may—June). Fish kills there may be up to 25-90%.
The source of the pathogen are sick individuals, individuals-microporosity.
In the prosperous economy of the pathogen is recorded more frequently affected fish, birds, fish inventory, water flow, etc. Infection occurs through the skin, gills, digestive tract.
Symptoms. The incubation period of the disease lasts for 3 to 30 days. It flows through acute, subacute and chronic.
In the acute phase of fish on different parts of the skin appear patchy and your bleeding, inflamed fins, scales ushirosugata, razvivayusheysya dropsy and exophthalmia protruding the anus. The affected fish become lethargic, roll over to one side, stays at the water surface and after a few days dies.
Subacute and chronic course of the disease is accompanied by the formation in places hemorrhages foci of necrosis and ulcers, which heal slowly.
I had been ill fish produced relative immunity.
Control measures. Disadvantaged ponds impose quarantine and treat the fish chloramphenicol, furazolidone, feed antibiotics, which give with food. In addition, increase the flow of water. In the ponds make quicklime to raise the pH of water to 8.5. Cleanse them from the sick and dead fish. Gear and equipment are sterilized with a 2% formaldehyde solution or by boiling. After the autumn fishing on the pond bed and cleanse twice (fall and spring) is disinfected with quicklime (25 kg/ha) or chlorine (3-5 kg/ha) lime.
The most effective method of rehabilitation of ponds is their treatment at intensive.
Quarantine may be lifted after a year since the last case of the disease in fish. However, if not carried out the treatment at intensive ponds, following the quarantine imposed restrictions, according to which the water bodies during the year the export of fish for the purpose of breeding, cultivation and acclimatization is prohibited. In this period of prosperous farms susceptible fish are imported and kept for at least 3 months in previously disadvantaged ponds with local fish. If imported fish is not sick, ponds declare prosperous.
Prevention. Do not allow contamination of water bodies, regulate water flow, organize full feeding fish, imported fish seed are planted in the ponds separately from local fish producers and fish carantanorum repair within 30 days.