Koi Sexing

On younger Koi it’s difficult to tell the sex of Koi, but it more easier when they get older.
Females Kois tend to have rounder bodies and rounder pectoral fins and their fins tend to be somewhat smaller. Males Kois are sleeker, with more pointed pectoral fins, and their fins tend to be larger. Some people say that the colors of males Koi are more brilliant. Older males Koi have a sand paper like raspiness on the gill plates, and some claim you can also feel a roughness if you lick your tongue across the front of the pectoral fin. The easiest way is when there is a particularly aggressive male Koi chasing the females Koi, with the proverbial nose up the butt, you look for other males Koi chasing the same now identified females Koi.

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