Horny Guppy

The sword mollie cross has a beggining of a sword and the body is "thicker" and black and white. The guppy cross is fairly small and is 'thicker' and black and white.

Can u get a pic of your frieds cross!!!!

Thier is no know images of a cross and I've never heard of the crossing befor.
 
The sword/molly cross died from a nitrite spike and she just got the tank levels down to normal. I will see about the guppy/molly cross. Actually I will buy it from here, after all I gave it to her in the first place or I will give her a swordtail.
 
Guppy or molly with either platy or swordtail is impossible. It's like trying to breed a dog with a cat.

Now guppy with molly is possible but the offspring are fragile and, as far as I am aware, sterile. This is somewhat analogous to crossing a horse with a donkey and producing a mule.

Platy with swordtail happens all the time, on the other hand and the offspring are just as healthy as the parents. In keeping with the theme, this would be analogous to crossing a wolf with a coyote. ;)

Looking at the genus two species belong to is a good guideline for predicting whether they will be able to hybridize or not. However, it isn't a sure guide. Both platies and swords are in the genus Xiphophorus and both mollies and guppies are in the genus Poceilia. But, clearly, the ease with which these fish hybridize and their genetic compatibility is not comparable.

Genera are assigned by people and only really indicate how closely related the species are. While it's true that more closely related species are also more likely to cross and produce viable offspring, the fact that the genus is such a subjective thing means the relationships can sometimes be incorrect or you may be dealing with a species that is 'only just' within the specified genus. The genus will also often change as the classification is revised.
For example, the banded gourami (Colisa fasciata) has also been placed in the genus Trichogaster.
Another example is the honey gourami which has been placed in the genus Trichogaster as well in the past (last time I checked it was in Colisa[/i though) and yet could hybridize (and obviously still can!) with a Colisa species - Colisa lalia.
 
Actually, I'll differ on whether or not a Guppy can cross-breed with a Platy. Our female Micky Mouse Platy within the last two weeks has given birth to two fry's of Pluppies (with a few more fries to be expected at this point). We have 5 Pluppies from the first fry, and 8 Pluppies from the second fry (which we just found and counted today). We know that they have to be Pluppies because we have only ever had female Platy's (for MONTHS) and the male Guppy (which has since died within the past 4 days).

The Pluppies from the first fry are all a bluish orange hue (as opposed to the bright orange of normal MM Platy's), and do not have the tell-tale MM marking on the tail. The tails are larger and more like a Guppy, and they have some black striping along the bodies, and with some black spots on the top of the heads of some. All of them have been growing like crazy, and most are over 1cm in length now (if not more). I'll attempt to get some pictures in the next few days.

The father (male Guppy) has a blue Guppy with black markings.

Feel free to contact me if you are curious, but these are DEFINITELY a Guppy/Platy cross.
 
I'm sorry their is know know cross of guppies and platies, where are u from?

Can u post photo's?

Also platies can store sperm for up to 6-8 months. and from many males, So even if the some show MM and other don't then this is not evidence of a cross.

The gonopodium structure of males is the primary way to well the genus of a fish. This is what's used to place packets of sperm on the genital opening of the female, if they do not match then a crossing is almost impossible.

Sadily the structure of platies and guppies are very different thus no chance of a cross.
 
UPDATE: may be getting the guppy/molly cross tommorow if my teacher agrees. Actually for more proof, the guppy I gave the fish to her( not old enough to breed, 2 months old) and I gave here a male breedable dalmation mollie. After a while the female became breedable and she breed with the molly. I saw the baby again today and it is black and white with orange( probably the one I am going to get) and it is a female! The mom is actually orange and blck and white( alot of orange)( dont know how I missed that). So I am going to breed either one with a male mollie and show pics of the babies( If I am able to get the cross in the begging). I know that this was a mouthfull, but I thought that this was worth posting.
Here is a link with a pic of a "muppy or golly"
http://www.guppies.com/forums/showthread.php?t=8122
 
That fish u linked to is a wild fish what has a very diverse colour range called Poecilia sphenops
They are related to guppies, and are the wild form on the of the common molly. Not the sail fin as this is a nother species called Poecilia latipinna.


 
As was said above, that's not a guppy/molly. But I don't think anyone's disputing that a muppy/golly is possible.

Anyway - platies and guppies absolutely CANNOT cross. That's it, period. lol As was said, these livebearers can store sperm for half a year! There is no reason to assume any fry produced in the absence of a male of the same species are hybrids!

Try raising some fry yourself and isolate the young fry before they have any chance to mate. Then try a hybrid cross (when you are absolutely certain the females have not stored any sperm) - I guarantee you will NOT get fry!
 
As was said above, that's not a guppy/molly. But I don't think anyone's disputing that a muppy/golly is possible.

Anyway - platies and guppies absolutely CANNOT cross. That's it, period. lol As was said, these livebearers can store sperm for half a year! There is no reason to assume any fry produced in the absence of a male of the same species are hybrids!

Try raising some fry yourself and isolate the young fry before they have any chance to mate. Then try a hybrid cross (when you are absolutely certain the females have not stored any sperm) - I guarantee you will NOT get fry!

On which fish? The molly/guppy or the swordtail/platy? My teacher said that she was to attached to them and didnt want them to go away. I aked the students and they said they want to keep them. If I evr get more mollies I will try to get a cross breed.
 
Are you asking which you should isolate? It doesn't matter - the point is to cross a guppy with a platy and prove it's possible. So you either isolate a female guppy fry or a female platy fry. Once it's large enough to mate, you put in a male of the other species. If they produce fry, there's your proof - they've hybridized. Only it's never going to happen and you need to isolate several fry as it's not possible to sex them when they are still very young. You'd have to pick out maybe 4-6 fry, put each in its own tank and then wait for them to mature. Then pick out one definite female, put her in a tank not containing any other livebearers and then introduce a male of the other species and see if you get anywhere.
 
With platy/guppy You can try, but i used to have 50 tanks and many livebearers, i know they will never cross from experance and talking to many livebearers hobbiests....

With molly/guppy then have a field day, would be fun my self but only have 6 tanks myself so no space.

But these are very rare, and the offspring are usually sterile.
 
My teachers molly cross bred with the female guppy/molly cross so it cant be sterile unless the fish fairy made a stop!
 

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