are my mollies pregnant

Question
i have a 10 gallon tank i got my mollies yesterday. my dalmation molly has bean swiming a round the filter and heater a lot.and my golden molly has a big black spot at the end of her stomack. are they pregnant? and they are big.

Answer
Hi Daniel
Well, if they're females, they're most likely pregnant.  That's usually a given with livebearers :)  Belly will look big, sometimes you may see the gravid spot-really depends on the coloring of the fish.  To tell females from males, the bottom fin closest to the tail-if it's triangle shaped, it's a female.  If there's a tube shaped thing-called a gonopodium- that goes towards the tail, that's a male.

Good luck!

Christy