sexing guppies

[newfishies]

i purchased some young guppies almost a month ago, and i thought i had separted all the females from the males, but tonight, i thought that a few of the fins looked like something halfway between male and female. they are about an inch long...is this possible, or are their fins just curled up a little? thanks for the help!!

 

[Tempestuousfury]

They change their sex a few months after birth, as well.

Some even change genders later on, but are infertile.

 

[ferrikins]

They change their sex a few months after birth, as well.

Some even change genders later on, but are infertile.

from what I read there not enothe evidence to supggest any fish can reverce, they are just late develipors.

 

[kitty falol]

The guppies' sex is determined at birth, but many male guppies are late developers. I've got one little guppy that had a proper gonopodioum at 5 weeks, while I had some much bigger and older guppies that didn't develop full gonopodiums until 2 or 3 months old.

I think I read something about their rate of developments depending on the ratio of male:females already in the tank, but I can't remember the science behind it.

 

[Shark_Lover]

I've heard that in some other fish....hmmmm...forgot what it was

 

[guppler]

I've heard wierd stuff about guppies changing sex too. Once i was at a store and a lady was instructing the guy to catch her one that she insisted was a female being chased around in the boy tank that was in process of a sex change. I don't remember if it was at the same time, but i heard a suggestion that they might switch genders if there were not enough of the other gender in their environment.
I'm not sure what to think about some of that stuff, but I have had some late bloomers and strange fish. i think Lumpy was the one that totally looked like a female other that the gonopodium, and i thought Hook and Twiggy were girls for months before i changed my mind, but probably not quite as long as Lumpy. He even had the other guppies fooled, but sometimes those boys pick on anybody big or fat. I don't know if their late development had anything to do with the fact that all the above fishes had birth defects, or if I just payed more attention to them because they were easier to recognize. Come to think of it , 2 or 3 of my snakeskins looked a little girly (relatively small rounded tails on relatively large rounded bodies). Maybe that's one reason why they didn't reproduce.

 

[newfishies]

they are definitely becoming males...their colors have darkened/brightened and they definitely have gonopodiums. i wonder if it has to do with the sex ratio, or if they were just lat bloomers...hmmmmm....i thought there were 15-18 female fry (hard to count them all) but now i think i have about 5 males and 10 females...