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When asked to imagine koi fish, most people would remember the vividly-colored ones – the red, orange, yellow and even the white ones. These colors are more eye-catching and certainly have become definitive of what koi fish look like. Only few people would imagine the black koi, and those who do would usually be koi owners who have developed a deeper appreciation of koi over time, and have grown to understand the significance of the black koi. Black koi have a more subtle allure, a mystery that surrounds them, and those who are curious enough to dig deeper will discover their rich significance.