How do you tell your male and female guppy fry apart?

Question

I have guppys and theyve been having babies, probably in total we have about 60 or 70 fry.
Well im not sure quite when I should start telling them apart based on male and female
How many weeks old can you tell?

Answer 1

I apologize for all the lesser quality answers you've gotten so far. In so far as telling if you have males or females in fry, I think it's very hard to tell. I've got about six fry going now, and hadn't been able to tell really well if I had males or females. I have been able to identify two females so far, but when they were extremely young, like in thier first couple weeks, there were no markings I could see to tell. I'm up to about 6 weeks with them now and I can clearly see the darker gravid spots on a couple. That's the only thing I can think to do. Look for rounder darker bellies to tell you you have females, and if the tails get bigger and more colorful, I'd say thats a good chance you have males. Granted, eye sight is not my greatest sense of my senses either, and I happen to find looking for little things like that difficult for me. That's the only guidence I can give.

JV

Answer 2

Male Guppy Fry

Answer 3

There is no way you can tell the fry apart at one week. They can however breed at a quite young age (6 weeks maybe), but not until the males develop some colour and their modified ventral fin. So what you need to do to prevent breeding is to keep observing them, and remove the ones that start looking like males as they develop. That way the only fish in the tank are either immature, or females, and none can get preggo. The 2nd tank will then house only fish you are sure are males. Ian

Answer 4

well males have a gonopodium. the males anal fin is long and narrow where as the females are bigger and wider. so u can tell tell the sex when they are tiny but the bigger they are the easer it is to see. i can normaly tell by day 3-4 but i often mistake a few males for females untill they get to about 2 weeks. i find it helps to put them in a pot and hold it up to the light to get a better view.

also incase u dont konw yet the parients will normaly eat them so if u havent allready put them in a diffrent tank or hope u got loads of plants.

oh and also females arnt allways dull and brown i have females with blues,reds,yellow with black spots, coulered tales. the adult males are smaller and there tails do look nicer.

good luck.

Answer 5

Jon V is exactly right, you can't tell until about 6 weeks in most cases. The main thing to look out for is the males starting to develop a gonopodium.

MM

Answer 6

when I look at them from the top of the aquarium , some fry are darker and some lighter color. I will separate them and see how they turn out to be male or female. otherwise , wait to see the colors as they grow bigger

Answer 7

the males are more colorful...the females are always the ugly brown or grey ones...and the females should have a little black spot on their stomachs when they are pregnant

Answer 8

don't fry them baby fish

get a catfish instead maybe

the male ones get colors on them I think

Answer 9

unless you kill 'em and use a microscope it's impossible until they are older

Answer 10

ask a doc