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Thread: Koi Male or female

  1. #1
    Join Date
    Nov 2018

    Koi Male or female

    What's the easiest way to tell the sex of a koi

  2. #2
    Daihonmei MikeM's Avatar
    Join Date
    Dec 2003
    Orlando, Florida
    There is no easy way when the fish are young. Even the most experienced breeders guess wrong with tosai. With older, well-fed koi, it is usually obvious because the females will be bigger around from carrying eggs, and the males will be more slender. However, a lot of folks have experienced the surprise of a fat male they thought was female, and a slender female they thought was male. I have bumped up a couple of threads that list various traits to look for. You can be pretty sure a koi is male if there is roughness on the gill plate, but smooth gill plates do not mean the koi is female. It could be a male that matures slowly. By 3 years, it is usually clear cut, but there are always some exceptions.

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