My Molly fish has a swollen belly and is isolated. Pregnant or ill?

Question

A female(?) Molly fish with swollen belly, isolated from the other fish in the tank. Had for approximately 17 days. Pet's info: Fish | Unknown - Fish

Andrea M. Brodie, DVM · Accepted Answer

Hard to say from your description whether she is pregnant or ill. You can tell male from female Mollies by looking in the area of the anus. A male Molly has a so-called gonopodium. The gestation period of a molly fish is about 60 days. Female mollies can store sperm for months and may fertilize eggs as often as every 30 days, even without a male in the tank. Mollies may release 10 to 60 live babies at a time. Here is an illustration of sexing Mollies (and other live bearers)(credit: Mwahahahaa) http://photobucket.com/gallery/user/Mwahahahaa/media/bWVkaWFJZDoyMDk0MTEzNw==/?ref=

My Molly fish has a swollen belly and is isolated. Pregnant or ill?

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