Although not universally true, it is a sad fact that we can attend a koi show in many parts of the world and come away thinking there are only three varieties of koi, Kohaku, Sanke and Showa, "the big three". The so-called "Go-Sanke" varieties have dominated the hobby for decades and will probably continue to do so, since excellent, particularly large, examples are accepted as being very difficult to produce, therefore worthy of the top awards they tend to attract.
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