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Thread: Sexing a Guppy

  1. #1
    Join Date
    Feb 2006
    Location
    Arlington, TX
    Posts
    32

    Sexing a Guppy

    How old do guppies usually need to be before I can tell what sex they are? Do I just figure it out by their tail or is there some other way? I think for the time being until I can get more tanks set up I am going to try and keep only the males but in a seperate tank since they are prettier since the tank would be in plain view in my house.
    80 Gal
    *5 Pseudo. "Acei"
    *5 Rusty's
    *7 Yellow Lab
    *7 Cyn. afra (Cobue)
    *2 Red Tail Sharks
    *1 Pleco

    29 Gal
    *1 Dojo Loach
    *2 Flame Dwarf Gouramis
    *6 Black Skirt Tetras
    *4 Zebra Danios
    *2 Albino Tiger Barbs

    10 Gal Hex
    *1 Male Fancy Guppies
    *2 Female Fancy Gupies
    *Fry
    *Cherry Fire Shrimp

    10 Gal
    *Guppy Fry

  2. #2
    Join Date
    Oct 2005
    Location
    British Columbia
    Posts
    434
    Some people say they can sex them when there a few days to a week old but i think the majority say about 3-4 weeks,I had a hard time doing it even when mine were just over a month.

    I have gotten better now!!!took some time.

    The females will have a visible dark spot (gravid spot) at the back of their belly,this is easier for me to find first.

    If you do a search on the forum for " sexing fry " you'll find lots of info and i think a few pics of what to look for.
    )) -::- -::-
    . ))
    ((.
    -::- ((.


    100 gallon - Gerbils
    1 55 gallon - Apistogramma & Cichlids
    1 55 gallon - Dwarf Kribs (i think,since they never grew )
    29 gallon - Breeding pair of Kribs and new babies
    20 gallon - Yellow Tiger Endler females and 1 male California Tiger Endler
    1 10 gallon - Mix of guppies and endlers
    2 tanks not in use as well

  3. #3
    Join Date
    Jul 2005
    Location
    Fernandina Beach, FL
    Posts
    480
    I can usually see a gravid spot around 1-2 weeks of age. I would suggest removing the ones you KNOW are female rather than removing the males. It's not as bad to get one female mixed in with the males as it would be to get one male mixed in with the females.
    When in doubt do a partial water change
    If she's been exposed to a male I give a 99% guarantee that she will have her babies within the next 35 days....next question?
    Link For fishless cycling!!!!http://www.guppies.com/forums/showthread.php?t=12053



  4. #4
    Join Date
    Jun 2004
    Location
    Arlington, TX
    Posts
    3,017
    Better to go by the gonopodium... that usually starts to form within 10-21 days. Sometimes IF you know who the parents are (and they are HB strain) and the male fry have good color at birth, you might be able to seperate m/f almost from the time she drops. Female fry at birth are usually colorless.

  5. #5
    Join Date
    Feb 2006
    Location
    Arlington, TX
    Posts
    32
    Hey Kimo, your in Arlington? I am too!

    Well all of mine look pretty much colorless, but they were also born on the 22nd and the 27th. I am getting a 10gal setup for fry only. I will try and figure out the sex thing in a couple more weeks. Thanks for your help everyone!
    80 Gal
    *5 Pseudo. "Acei"
    *5 Rusty's
    *7 Yellow Lab
    *7 Cyn. afra (Cobue)
    *2 Red Tail Sharks
    *1 Pleco

    29 Gal
    *1 Dojo Loach
    *2 Flame Dwarf Gouramis
    *6 Black Skirt Tetras
    *4 Zebra Danios
    *2 Albino Tiger Barbs

    10 Gal Hex
    *1 Male Fancy Guppies
    *2 Female Fancy Gupies
    *Fry
    *Cherry Fire Shrimp

    10 Gal
    *Guppy Fry

  6. #6
    Join Date
    May 2004
    Location
    Maine
    Posts
    26,347
    Blog Entries
    2
    I use a small clear glass and a magnifing glass
    At the age of 30-35 days the sexes can be distinguished by the development of larger body of the female and her gravid spot which males do not show. The male begins to show the developing gonopodium.
    Did you do your water change today
    "You have your way. I have my way. As for the right way, the correct way, and the only way, it does not exist." - Friedrich Nietzsche
    Don`t help others because others have helped you,help others because its the right thing to do!!!

    madmike140$gmail dot com

    Vice President Bostonguppyclub: MADMIKE

  7. #7

    Talking i do

    i can tell when they are first born but its hard cause they are so small

  8. #8

    you can tell by their fins

    The female has a trinanular bottom fin at the bottom of stomach and the males have a longer one doe not look like a triangle at all. With out picture hard to explain!
    Good luck!

  9. #9
    yeah thats how i figure it out

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