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How To Tell The Sex Of Koi Fish? Difference Between Male and Female Koi

Many koi owners often wonder how to tell the sex or gender of koi fish. There are certains ways you can tell the difference between male and female koi. Koi sexing starts through observation. One of the best ways to tell the sex of koi fish is when they are feeding. You will have your best view of your koi at this time.

In order to tell the difference between male and female koi they first need to be old enough.

Here are the differences between male and female koi:

Koi Fish Sexing - How To Tell The Difference Between Male and Female Koi1. Male koi are slender and like a torpedo shape.

2. Female koi fish are usually fatter at the abdomen. When viewed from above you can see they are wider and rounder.

3. Male koi fish have breeding tubercles come breeding time. These are small white spots specifically on the gill plates. Don’t mistake these for ich.

4. The biggest way to tell the difference between male and female koi fish is come breeding time. When koi fish begin to spawn and lay eggs you will see the male chasing or courting the female. If you see a koi bumping the back end or side of a koi it’s a good chance that it’s a male.

Knowing the sex of koi fish is exciting as many pond owners can’t wait until they start to breed. Breeding koi fish is very neat to watch and new baby koi are always a bonus. Next time you look at your pond fish see if you can tell the difference between male and female koi.


1 Comment to How To Tell The Sex Of Koi Fish? Difference Between Male and Female Koi

  1. modge's Gravatar modge
    February 8, 2011 - 4:24 pm | Permalink

    oh thank you for this post,, now i can identify the sex of my kois…

1 Trackback to How To Tell The Sex Of Koi Fish? Difference Between Male and Female Koi

  1. max
    on November 14, 2014 at 2:44 pm

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