Koi:

Koi are ornamental varieties of the common carp.  The word “Koi” literally means “carp” in Japanese.  However, Koi can also mean “affection” or “love” and so the Koi is a symbol of love and friendship in Japan and all throughout the world.  Koi can have many different colors, patterns, and scalation.  Most colors are white, black, red, yellow, orange, and blue.  Koi are genetically selected carp for their coloration.  The carp that produced different colors out of a batch of fry were used to produce another generation, and over time, the fish produced brighter and brighter colors.  This is why if Koi are allowed to reproduce naturally they will become all grey-colored after a few generations. 

In order to keep Koi in Ohio, it is recommended that a pond be at least 4 feet deep.  This will help the fish to survive the cold winter.  The Koi are most active when the water temperature is between 59 and 77 degrees.  During the winter when the water temperature is low, you do not need to feed your Koi.  The digestive tract of the fish will slow down so much that if they are fed, food will just sit in their stomach and may cause them to become ill.  It is also recommended that Koi are only raised in ponds that have a liner or in watergardens.  If stocked in an earthen pond, the Koi will constantly stir up the mud on the bottom of the pond causing the water to always be turbid.  This will deter swimming and other activities. 

AQUA DOC carries several different types of Koi that you can add to your own backyard pond.