Tropical Fish Keeping - Aquarium fish care and resources

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rhessling 02-22-2011 05:06 PM

sex change
i have i mollie about # inches that i bought at a lfs and she is now a he i know for suer it was a she when i bought it ass i have watched the change take place her or his gondulm is not fully formed its growing does any one have any ideas why this happned i have two males in a55 with it and one female wich is why i bought this one

Knifegill 02-22-2011 10:22 PM

I'd love to answer your question but I have to ask:

why u typ lyk dis?

I had a female molly develop a gonopodium as well. 'He' is apparently sterile but still mates with a large female anyway, just no fry. Don't know why it happens, but it does.

tanker 02-23-2011 04:18 AM

I have platies and I read that when they are young they might appear to be female and develop their male characteristics when they are older. It's probably the same for mollies, based on what you are describing.

Christople 02-24-2011 12:38 PM

that is so bizzare

froggle1 03-03-2011 05:10 PM

I've heard of other types of fish changing genders. Kind of gross to think about, eh?

Andarial 03-03-2011 05:12 PM

It's not gross in my opinion it's just the way they are

Christople 03-03-2011 07:22 PM

if not gross weird

pringleman1 03-04-2011 04:59 AM

it is the case of when they are young fry they all look to be female and when they get bigger and older then some develop into the male gonopodium thingy.
Its either that or my female platy gave birth to about 40 female fry 4 weeks ago.

Lupin 03-04-2011 05:24 AM

Sounds like a late bloomer to

Amethyst123 03-07-2011 05:40 PM

It's totally normal sexual development, not a sex change
This happens with platys, mollies, guppies, and so far as I know all livebearers. It is NOT a sex change, and the males are not infertile, at least not for that reason. Any given fish may be infertile, of course, but not for that reason. In fact, some male platys, known as "early maturing males," are clearly male at around 1/2" and they ARE often infertile. Some are fertile, but they usually remain smaller, and are less likely to mate than their larger, later developing competitors.

These fish are all born looking female. Sometime later, usually at least 6 weeks to two months, the anal fins of the males start to differentiate. What actually happens is that the middle of the fin starts to grow longer, and over the next week or two, the elongated part becomes longer, the top part contracts, and you end up with a male gonopodium.

As for the "infertile" male someone mentioned: My guess is that you've probably had fry that you never saw. All livebearers will eat their fry, and the fry of other livebearers, unless separated soon after birth, or provided with LOTS of hiding places the adults can't reach.

If you want to keep the babies, separate the mother when she looks ready to burst and has developed a distinctly darker area behind her belly. Her sides may also appear lighter than normal, due to skin stretching. You can use a breeder net in the same tank, but I would recommend a seperate tank, because then the young will also have room to grow out some. Once you see babies, put her back in the main tank. Don't put the babies back in until they are at least 1/2 to 3/4 inch long, or longer if you have fish bigger than the parents in the tank. Remember, however, that livebearers are quite prolific. Platys can have 20 to 40 fry every month; guppies can have up to 100 every 3 to 4 weeks. So think about your overall capacity for fish, and/or ways to give away or sell them before deciding to let your fry grow up. You'll be overrun otherwise.

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