Sexing a molly?

Wardonianfungus

Member
I have a beautiful creamsicle molly but but sure if it’s male or female
 

Disglerio

Member
I think male, that analfin looks pointy to me. But I am no expert.
 
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Wardonianfungus

Member
I think it’s male as well but I’m still not completely sure
 

emeraldking

Member
Definitely a male. It´s started to show the male characteristics. Look even at his dorsal which is changing into a larger dorsal. So, not just the analfin that´s changing into a gonopodium. The shaping of his gonopodium is not totally done yet if I look at these pics. No doubts...
 
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Wardonianfungus

Member
Okay so when I’m looking for a female, I don’t want the pointy analfin, and large sail?
 

e_watson09

Member
Well a couple things. In sailfin mollies yes the male generally (not always) has a much larger top fin. Any other type of molly that is not always the case.

Livebearers the most accurate way to tell is by their back fin under their tummies. Females will have a round "analfin" males will have a gonopodium which is a pointy fin. If you follow this link it should take you to a photo showing the difference. This is true for other type of livebearers as well (guppies, platy, molly, swordtails)
 
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Wardonianfungus

Member
Ok, thanks! Next time I go to my LFS, I’m getting another molly.
 

emeraldking

Member
Wardonianfungus said:
Okay so when I’m looking for a female, I don’t want the pointy analfin, and large sail?
For this type of molly... yes! Look for an adult female not a very young looking specimen. For even mollies can show the male or female characterics pretty late. Young males will still have the shape of a female. And I don't mean just the analfin but also the body shape. Depending on the kind of molly, the dorsal may grow out just like e_watson09 has already mentioned.
e_watson09 said:
Well a couple things. In sailfin mollies yes the male generally (not always) has a much larger top fin. Any other type of molly that is not always the case.

Livebearers the most accurate way to tell is by their back fin under their tummies. Females will have a round "analfin" males will have a gonopodium which is a pointy fin. If you follow this link it should take you to a photo showing the difference. This is true for other type of livebearers as well (guppies, platy, molly, swordtails)
What you're saying about the analfin only goes for juvenile (young adulthood) and adult ovoviviparous livebeares but not for viviparous livebearers. And the analfin of an ovoviviparous female livebearer is more edged in comparison to a viviaprous female livebearer (which is more round). Juvenile and adult males of ovoviviparous livebearers have a gonopodium but males of viviparous livebearers have an andropodium.
Here are some illustrations from my own website about livebearers:




Most people are familiar with ovoviviparous livebearers.

And mind that the shape of the gonopodium of several males of ovoviviparous livebearers does differ. Which enables or disables them to crossbreed with an ovoviviprous female livebearer of another kind. The genitals of both genders (regardless of what kind of ovoviviparous species) should be compatible in order to mate. Otherwise, an actual mating won't take place.
 
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Wardonianfungus

Member
emeraldking said:
For this type of molly... yes! Look for an adult female not a very young looking specimen. For even mollies can show the male or female characterics pretty late. Young males will still have the shape of a female. And I don't mean just the analfin but also the body shape. Depending on the kind of molly, the dorsal may grow out just like e_watson09 has already mentioned.

What you're saying about the analfin only goes for juvenile (young adulthood) and adult ovoviviparous livebeares but not for viviparous livebearers. And the analfin of an ovoviviparous female livebearer is more edged in comparison to a viviaprous female livebearer (which is more round). Juvenile and adult males of ovoviviparous livebearers have a gonopodium but males of viviparous livebearers have an andropodium.
Here are some illustrations from my own website about livebearers:




Most people are familiar with ovoviviparous livebearers.

And mind that the shape of the gonopodium of several males of ovoviviparous livebearers does differ. Which enables or disables them to crossbreed with an ovoviviprous female livebearer of another kind. The genitals of both genders (regardless of what kind of ovoviviparous species) should be compatible in order to mate. Otherwise, an actual mating won't take place.
Thanks. Without those pictures I wouldn’t have known what you were saying at all.
 
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Wardonianfungus

Member
Well now I’m hoping that it’s a girl because it looks pregnant
 

lazaruslewis

Member
100% male
 
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Wardonianfungus

Member
Yeah, it just pooped and looked normal again. I don’t know and can’t figure out why it was so fat, but it lasted about a day
 

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