Цікава стаття про лікування коропових — Лечение карпов кои (англ)

A few words about treating Koi and Goldfish in a pond environment…
Koi & goldfish treatments do not work in cold water! Cold water = 65°F or lower. It is best to have a way to isolate and treat the fish away from the pond. The bacteria and other pathogens that attack your Koi and Goldfish love the cooler water. To speed the healing process, it is best to heat them up! 80° to 82°F works very well. The only reason to heat the fish up any higher, is if they have contacted a viral infection. KHV, SVC and Dropsy, can be cured with heat only. 86°F+ for a one week heat treatment is required to kill a virus.

EASE UP ON THE SALT! Are you having an Ammonia or Nitrite problem in your pond? A very high salt level such as 0.03% in your main pond will destroy your beneficial bacteria. Salt is very antiseptic and kills bacteria. Even your good bacteria! You should never ever do this. High salt levels are meant for a bath in a hospital tank or as a dip. A normal salt level for your main pond should be 0.01% or lower.

Notice something about our product section on this site? We do not carry injectables. Why? they are not needed. People do more damage sticking needles into their fish than our medications could possibly do. Adding an antibiotic to the Koi or Goldfish feed is much safer and it really works. Fish are low in vascularity so the injections do not work the same for a fish as they do for dogs, cats and humans. F.Y.I.

And last but not least: Never ever remove your Koi or Goldfish from the pond and wrestle it around trying to put antibiotic ointment on it or a Betadine/Iodine type product. These things will wash off of the fish anyway and are for a temporary sterilization only (surgery). You will do more harm to the fish by stressing it out this way. An example of this would be if you had a cut on your hand, applied these products and then went swimming.

Open sores on your fish? This is one of two things, either Aeromonas bacteria, or Pseudomonas bacteria. How can you tell the difference? You can’t. These two pathogens create open sores on the fish that look identical in appearance. If you cannot make a slide from a scraping on the fish, then you will have to treat them with one or two different antibiotics. Aeromonas bacteria is the most widespread during spring and summer. We suggest using Oxytetracycline hydrochloride for this treatment. If you use this antibiotic for 7 days and no improvement is seen, try switching them over to Neomycin. Neomycin sulfate and Kanamycin sulfate are used to treat Pseudomonas bacteria.

Open sores go away and come back again? If this is the case, it sounds like your fish has come into contact with a virus, either SVC or KHV. The reason that the sores are coming back is, the antibiotics are working in a bacterial-static manner. Meaning that, they are working for the secondary infections on the fish, but not on the virus. You must isolate these fish if possible and heat them up to 86°F — 88°F for one week. Slowly cool them down to around 80°F and treat any secondary infections they may have at this point.