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How can you tell if a koi fish is a boy or girl?

Asked: Brunda Scoot, Last Updated:

There are two main indicators of sex in koi. The easiest way to tell is from fin shape and color. Male koi have smaller, more pointed fins that are opaque and generally colorful. Female koi, on the other hand, have larger, rounded fins that are partly or completely translucent or even transparent.

FAQ

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