koi question

[Gladys]

Hi! I have a koi pond but I can't tell which are males and which are female. How can you tell the sex of a Koi. I have one koi that has been getting a fat belly. Does that mean that it might be a breeder? Thanks for your response.
Gladys:

[dancethenparty]

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that will help with sexing. it depends, they could jhust be overfed or bloated as well. how about a pic?