Koi have six types of color cells in their skin. Their cells can be red, yellow, black ... fish, the bigger the price tag. Today there are about 120 varieties. To compare, there are about 200 ...
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Koi Fish Are 'Living Jewels' of the Water Garden"The popular koi fish of today are actually ornamental varietals of domesticated carp," Hilstrom says. "Black carp originate from China and were first bred for red color mutations (noted around ...
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