Koi health is very important if you want to appreciate your fish for a long time. Koi fish are known to live for decades even though the usual life span is 20 to 30 years. Koi are hardy and tough; but, they can get sick. Their longevity depends largely on genetics and living conditions.

The modern koi are tough but they have lost much of the toughness of their ancestor, the magoi carp. They can flourish in the poorest water conditions and stay unaffected by the existence of parasites. This is because of the inbreeding process that started long ago when nishikigoi was first being developed. Breeders have had to pair koi with parents and siblings to obtain the perfect body shape, intense colors and beautiful patterns that make the present koi so admirable.

Nevertheless, the koi of today hardly ever get sick and if they get sick or perish, you can find the underlying cause to water quality problems. Similar threats to koi health are parasites, ulcer disease, predators, medicine overdose, leaping out of the water, virus infections, toxic pesticides, and tumor.

Water Quality

Poor water quality is the leading cause of koi death. You will need to watch out for the pH, ammonia, nitrite, nitrate as well as oxygen levels in your pond. Even small alterations in their levels can negatively affect koi health. PH pertains to the acid and alkaline levels of your water. Koi need a pH of 7.0 through 9.0. Ammonia is produced by your koi in the form of waste. It can be removed effectively by using biological filter system that makes use of the nitrification cycle.

Bacteria will transform ammonia to nitrites. Even so, nitrites are still toxic to the koi and must also be converted by other bacteria into nitrates that are relatively harmless to the koi. Nitrates, in turn, are consumed by the plants and algae in the pond. You already know how oxygen is needed to support life. As your koi grow larger, they will require more dissolved oxygen. To ensure that there is a lot of oxygen in the pond water set up a waterfall, jets or air pump, or place air stones to add oxygen into the water.

Parasites, Ulcer Disease and Bacterial Infections

If the koi fish perish or exhibit irregular behavior regardless of the good quality of your water, you could expect the reason to be either parasites or bacterial infections. Parasites like anchor worms and fish lice can be destructive to your fish. The initial signs are red or white pimples that rapidly change into sores. The ulcer can get into the muscles of the fish so you have to discover the disease while still in its early stages.

You will need to keep you koi clear of parasites. Keep the affected fish in salted water and supply with medicated food. You can swab the sores using betadine to help them recover. Talk to a veterinarian on how best to cure your koi.

Quarantine

You will have to quarantine any new fish for three weeks before introducing them to the pond. Throughout this period, you will have to treat the fish for parasites. If you lack a different quarantine tank, be sure to purchase your koi only from trustworthy dealers that guarantee their fish to be parasite-free. Also carefully choose the plants for addition to the pond which also needs to be parasite-free.

Overcrowding

If you continue having koi health troubles (such as stunted growth or perhaps erratic behavior) despite that your water is of top quality and you bought only parasite-free fish, you may want to evaluate your koi population. Your fish may be suffering from stress due to overcrowding.

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