How to Identify Male and Female Livebearers by Pondguru
Nov 8, 2026
This video shows how to tell the difference between male and female guppies, mollies, platy, swordtails, endlers and other common tropical fish.
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Thanks for watching
Hello I'm Richard from Tyne Valley Aquatics
and in this video I'm going to show you the
differences between male
and females in the more commonly available live bearers.
There's hundreds of species of live bearers
that are available but the more common ones
are quite easy to distinguish between male and female.
Here's the differences.
Fin underneath the fish, that one there,
is the main way to tell the difference between
male and female live bearers.
We'll start with a really easy live bearer
to tell the difference which is
black chin live bearer.
You notice that fin underneath, the anal fin, on the males
it's elongated. It's actually called a gonopodium.
On the females it's a totally
different shape. That colorless fish there is a female.
Notice how it's anal
fin is like a wedge shape, thick triangular shape.
There's one at the back.
There's two females at the back, two males at the front.
Fin underneath, totally
Totally different on male and female.
Here we've got some male guppies,
notice the fin underneath the body, long and thin,
different from the females.
On the guppies the males are generally the much more pretty fish,
have a hell of a lot more colour on than the females.
There's a couple of female guppies,
notice the fin underneath, not much colour on them,
nowhere near as much as the males. With endlers
or microplaties, species of live bearers,
the males are the bonny ones, they are absolutely tiny,
Compared to the females, see the males pursuing the female there?
There's a few different types of endlers in this tank,
but only one type of female.
With swordtails, you can tell the difference by the fins underneath.
There's a female there, big wedge-shaped fin.
But also, the males develop a sword on the lower part of the tail.
Hence the name, swordtails.
These are a strange one, because females can actually turn into males.
If they feel there's not enough males in the group,
some of them will turn into males.
Colouration on sword tails is pretty much the same between male
and females, so the fins is the best way to tell.
With platys, because the males and females are pretty much
the same colour, you go by the anal fin again, simple way to tell.
And the same is true with mollies, anal fin, totally different on males
and females, see the white one in the middle of the screen there,
that's a male, elongated fin underneath it, find a female,
there that black one there, female, triangular wedge shaped fin.
Moving on to something slightly more exotic. These are called
Limia nigra fasciata. They're sort of live bearer
because the males and females color-wise
are pretty much the same. You just go by
the anal fin again. There you go, that's a male.
There's a female. Female's body's a bit fuller as well.
That one's obviously got young inside it. And actually the body
is also another way to tell the difference
between male and female. Where's that female? There she is.
The body is much
Broader, much fuller, fatter than the males,
not always the case, but on guppies, especially
towards the anal fin, you tend to get a black patch,
same with swordtails, platys, mollies,
and that's actually the young development inside the fish.
There you go, there's a guppy there,
black one that's freaking out, it's got a black
patch just underneath its belly towards its anal fin,
that's actually the young inside
the fish.
These are female venus guppies, which is like a sort of endler.
Tell by the colour, largely colourless. They're females.
The fin underneath is wedge shaped and they've got black patches
towards the back end of their bellies. That's the young inside them.
In fact, there's a few of the young have
looked like they've popped out there
towards the back of the tank.
That's it. Basically, pretty easy to tell
with a lot of the common live bearers.
The fin underneath the fish, the colour on many of the species.
And also the black patch towards
the back end of the belly on the females.
Fairly easy, once you know those tips.
Thanks for watching. Catch you next time.

