bassbonediva

Hey all. I have five or six juvenile guppies that I need to start culling so I can start swapping my tanks around and have room for everyone (working on tearing down a 46gal bowfront to make way for a 40gL which will house a betta sorority as well as several other community fish, which means my male guppies are going into one of my 10gal tanks). I only want to keep the males out of these juveniles. I currently have four males in the 46gal, but since the female bettas don't like the male guppies, they're getting a home of their own. My female guppies (except my deformed one) are all going to the LFS to be rehomed. Anyway, does anyone know how to sex juvenile guppies? They are about 3/4"-1" long right now and just starting to get the coloring on their tails. All of them have rounded tails (the females are regular fancies, the males are mostly delta tails with some regular fancy blood mixed in), but a couple of them are starting to get some spectacular coloring on their tails. All my females have yellow/black, black or yellow tails. Anyway, if anyone can help me, I'd appreciate it. No pics, sorry (don't have a camera and forgot to borrow my dad's).

dvc_r

By now you should be able to see the gravid spot on the females. It's hard to see, you need to look closely. Another way is to compare the anal fin, (males are more pointed). A little harder way is the distance between the anal fin and the pectoral fin are further apart on the male.

rt12

Its very hard to tell/be certin at this point. Wait about a month and you will be able to tell easily. Also Hardly any LFS will take a guppy before it has all of its coloring and is mature. But by then you will be able to tell obivously

platy ben

Look for the gravid spot, its pretty easy, in my experience, to tell from this size. The gravid spot, and you will also notice the typical male guppies mannerisms, flaring at females, following them around, etc..

bassbonediva

Thanks, guys. I'm thinking that at this point I have almost all females in the 10gal (among the juveniles) and the one juvenile that accidently got put in the 46gal and I never bothered to retrieve is a male. The one in the 46gal is starting to get more color on his body and the other males don't pay any attention to him (which they were all over even my deformed female when she was in there for a little while). I read that the females tend to only have color on their tails and the males have color all over (which is the case with my adults).