identify treat (koi fish disease)Koi fish diseases and Treatment
identify treat (koi fish disease) Regular koi pond maintenance and water-quality checks help keep diseases away from fish, but illnesses still occur, even in the best-kept ponds.The first sign of a problem may be a fish floating at the surface, by which time it is probably too late for effective treatment. For this reason, it is vital to set up a routine for examining fish; feeding time provides an ideal opportunity to check their appearance and behavior.
identify treat (koi fish disease) Environmental problems
The health of pond fish is hugely influenced by environmental conditions. During spells of hot weather, for example, evaporation can significantly lower water levels, which has the effect of concentrating dissolved nitrogenous waste. At the same time, elevated temperatures drive oxygen out of the water; the combination of nitrate and oxygen stress can be fatal, especially for larger fish. Many of these problems can be avoided simply by topping off water levels regularly during the summer, and incorporating a pump and filter; these improve water quality, break down waste, and increase oxygen content by creating water movement. Overstocking a pond, especially if it is not well established, places great stress on its occupants, and fish may succumb to usually benign bacteria that are present naturally in the water. Overfeeding is another common environmental problem, especially in temperate areas in the spring and fall; uneaten food decomposes in the water, encouraging populations of pathogens.
Dealing with disease
Disease-causing bacteria, fungi, and parasites may be introduced into the koi pond whenever it is stocked with koi fish or plants. Undesirable organisms can also be brought in on the bodies of animals, especially wading birds, that move from Koi pond to koi pond.These can multiply and cause serious harm
Bloat, or dropsy, is a serious condition, often caused by a fungal or bacterial infection. Isolate affected fish as a precaution, but this does not normally prove highly infectious
Fin rot begins in the inter-fin ray membranes, but spreads down the fins until it reaches the body, when it can be fatal. In extreme cases, rotten parts of fins may need to be cut off under anesthesia.
Fish lice are crustacean parasites that feed on fish blood. They are obvious when attached to the body, but also live free in the water for up to two weeks.
before their presence is detected, and eliminating them can be very difficult. A table of the most common conditions seen in pond fish, as well as treatment strategies, follows on page 324.If your fish are affected, you are most likely to first notice changes in their behavior and feeding patterns; a sick fish may, for example, distance itself from others, or take refuge from a plant. If a disease is suspected, affected fish should immediately be removed from the koi pond and kept in isolation, preferably in a large aquarium (see above). Here you can inspect the body close-up and check for symptoms of disease or parasite infestation. Fish lice will be visible in this environment, and you should also be able to detect gill flukes much earlier than would be possible in a pond.Treatments can be carried out in the tank itself, or in smaller baths, and the fish’s progress can be readily monitored before reintroduction to the pond
If a fish is affected with a disease or parasite, check other fish to determine whether there is a general problem in the koi pond or the disease is an isolated instance. Look out, too, for secondary infections. Sometimes the entire pond needs treatment with commercial chemicals, but often it is sufficient to treat individual fish. Check all water-quality parameters before reintroducing the fish; minimizing environmental stress will help prevent recurrence of the condition. Certain diseases, such as the rapidly spreading koi herpesvirus (KHV), are untreatable, emphasizing the importance of isolating new fish before introducing them to a pond (see p.311), and seeking professional advice if many fish become ill.
Reference Encyclopedia of Aquarium and Pond Fish D Alderton DK, 2008