Koi Fish Facts, Feeding, and Care
Koi Fish are beautiful but not the easiest to care for in an aquarium.
Koi fish are related to the Goldfish which is one of the most popular aquarium fish there is for a lot of reasons. The top two being they are very hardy and will pretty much eat anything.
Koi fish are very hardy and omnivores. They really don’t have much requirements for water besides it needing to be freshwater, relatively cool, and the pH of the water needs to be kept between 7.0-9.0. They can survive extreme ranges in water temperature. Since Koi fish are primarily used in outdoor ponds it is known that they can survive in frozen water. They do like a lot of shade so they can stay cool throughout the year. Once again like any Goldfish they will tear apart plants so be prepared for that.
Like any other goldfish the Koi produces a lot of waste and need to be in water that has good filtration.
At maturity ( 3 to 4 years) they can grow up to 3 feet in length. Their body is torpedo shaped. Their colors are brilliant and range greatly.
There are many stories of Koi fish having very long life spans. One famous example is that of a Koi living 226 years based of an examination of one of their scales. A real expectation for lifespan is about 40 to 50 years. Either way Koi fish can be a real investment of time so do not take them on unless you are willing to commit. Koi fish can also be very expensive to purchase. The price is based on coloration, size, and availability.
Koi fish are not aggressive and can be kept with other Goldfish and non-aggressive cold water freshwater fish.
Once again because of their size and waste production they really aren’t the best for an aquarium and better suited for ponds. If you do decide to keep Koi fish in an aquarium you will need a serious filtration system and good aeration.
Here is a great video that I ran across by someone that does keep them in an aquarium. It hals has a lot of tips on how to feed and care for Koi fish. There are some fun facts included.