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  1. #1

    Telling males from females

    Hey mates I知 having a bit of a tough time trying to figure out the sex of 2 fish.

    I checked their vents

    Stubble on face but the vent shape is female based on my readings.

    Stubble on face but vent shape is female based on my readings.

    Is it that the vents of both are the same but the overall shape is different?

    This is a confirmed female vent

    Any advice will be greatly appreciated.


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  2. #2
    Senior Member Rank = Grand Champion andikoi's Avatar
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    put a handbag in pond and play some tunes,and see which fish swim round it,theyre the females,or put a toilet in,the ones that go in pairs are all females,im gunna cop it off anne for this lol,hahahaha,,,,,,,andi

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  4. #3
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Quote Originally Posted by andikoi View Post
    put a handbag in pond and play some tunes,and see which fish swim round it,theyre the females,or put a toilet in,the ones that go in pairs are all females,im gunna cop it off anne for this lol,hahahaha,,,,,,,andi
    brilliant mate. crying with laughing

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  6. #4
    Very good Telling males from females


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  8. #5
    Extreme Koi Member Rank = Kyusai anne's Avatar
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    [QUOTE=freddyboy;313529]brilliant mate. crying with laughing

    ……...And me Fred...…. I nearly chocked on me cupppaaaaa…...you little Devil Andi....
    Hahahahahahahahahaha

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  10. #6
    so hard to tell when small even dealers will post things like un-sexed on fish for sale. the rule use to be if it has a hole or a O on the anal part its male if it is a Y or T shape is it female. as well as body shape as females tend to have a bigger body shape .

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  12. #7
    Senior Member Rank = Hassai Tom Koi's Avatar
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    Quote Originally Posted by skurban2 View Post
    Hey mates I’m having a bit of a tough time trying to figure out the sex of 2 fish.

    I checked their vents

    Stubble on face but the vent shape is female based on my readings.

    Stubble on face but vent shape is female based on my readings.

    Is it that the vents of both are the same but the overall shape is different?

    This is a confirmed female vent

    Any advice will be greatly appreciated.


    Sent from my iPhone using Tapatalk
    I reckon the top fish is female, just by going on body shape, but I'm assuming that their are the same age?
    Last edited by Tom Koi; 22-01-2020 at 11:05 PM.

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  14. #8
    Quote Originally Posted by Tom Koi View Post
    I reckon the top fish is female, just by going on body shape, but I'm assuming that their are the same age?
    Yes, both are around the same age. The smaller one is very hard to sex, it has a female body shape but at times the face seems rough just like a male.


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  16. #9
    Senior Member Rank = Hassai Tom Koi's Avatar
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    Quote Originally Posted by skurban2 View Post
    Yes, both are around the same age. The smaller one is very hard to sex, it has a female body shape but at times the face seems rough just like a male.


    Sent from my iPhone using Tapatalk
    Its a great question and I'd love to know the answer, I regularly watch youtube vids and I saw one, where a Japanese breeder was selecting very young Koi he was looking at their whatsits and putting them into separate bowls, so it seems like they can tell from a very early age, another video in by the Pond Digger or Pond Guru American video and he's at a dealer where the dealer is showing him how to sex them, they were older fish through, he's a big fella ginger hair and beard and tash.
    If I come across it later, I'll post link up.

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  18. #10

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  20. #11
    The females are the gobby ones


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  22. #12
    Senior Member Rank = Sansai samp09's Avatar
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    I always assume the rounder fatter fish are female, just from looking I am pretty confident my chagoi is female just by the shape of her and she's only 19cm. As for the Beni Kikokuryu I am not so sure

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  24. #13
    Senior Member Rank = Grand Champion Ajm's Avatar
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    I bought a 1 year old chagoi . Sorry don't the the terms. And the shop swore it was female toke it back to be scraped 6 months later and they said its a male or a super model female so I just look at shape now as you say big round female

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    Johnathan

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  26. #14
    I think I have it down now. The mature females are usually rounder with no rough touch feel along the face and from a side view their vents are convex. mature males are less rounded and more streamlined in shape they are rough to the touch around the face and when you look at them from a side view their vent is concave.


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  28. #15
    I will update here with some examples from my personal fish.


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