The word "Koi" simply means carp in Japanese. The colorful varieties of Koi carp available today are a strain which was first bred 160 years ago in Japan from a naturally occurring mutation. Learn more about the History of Koi and their Ancestry in our Gallery. 
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The Black carp or "Magoi" are one of the main carp strains that developed the Koi we see today. They are very similar to the common carp and basically differ in color and some body conformation. 
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