Sexing Fry

[Platymamma7277]

I have 7 platy/swordtail fry that are 12 weeks (3 months) old and they aren't showing any sign of gender. When should I be able to determine the sex? Thanks a ton

 

[gizzmo341]

at 3 months i could sex my fry platy how big are they?

 

[daizeUK]

The males should start developing a gonopodium at 4-7 months, some may be late developers.  They will probably be at least 2cm long before you can tell.

 

[Platymamma7277]

I'd say they're 1.5 to 3 cm they sizes vary a lot

 

[mrstwalker]

it could be that the males are releasing a hormone to prevent others to grow larger than them. do a 15% water change daily for them and see if that helps the development

 

[henningc]

In my experience feeding live baby brine shrimp and other live foods along with at least a 20L tank excelerates their development. I can always sex mine at 3 months.  I typically keep 6 or so large female Endlers with my sword fry as a ready source oflive food-Fry.

 

[Platymamma7277]

Thanks for the help

 

[lefty07603]

i thought i had all females until this week! these are pushing 7 months old! mine were late developers! Mine are like the kids who have a high voice until they are 16 but then change almost overnight! mine developed from almost no color to almost full color in 2 weeks! The gonopodiums just developed recently too! every fish is different

 

[Platymamma7277]

First confirmed male!! I'm a bit surprised because it is actually the bigest of them all