Sexing koi isnt an exact science per say all one needs to do is turn over a mature 10" koi to sex them.
When sexing koi there are a number of tell tales
1) A Female koi's fins are more rounded .
2) A Male koi's fins are more pointed.
3) A Females body is larger and more rounded
4) A male koi's body is far thinner
5) to sex a female :- When you look at the vent area you should be seeing that a female koi has a line running from head to tail which has another line running across the bottom...
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