Instructions
Look near the anal vent of your fish. If there is a dark spot, it is pregnant; this spot is known as the gravid spot.
Assess the belly area. If it is rounder than usual and appears distended, the fish is probably carrying young.
Look at the back end and the belly of your fish. If they are squarish, it is pregnant and close to giving birth.
How to Know If Dalmatian Fish Are Pregnant
The Dalmatian molly has a marbled black-and-white body and is also known as a marbled molly or marbled sailfin molly. The molly is a freshwater fish that grows to 4 3/4 inches in length. The Dalmatian molly is a live bearer and needs a tank of at least 25 gallons if it is breeding. The female gives birth every 60 to 70 days to approximately 10 to 60 young that are a half inch long. There are a few signs you can look for to determine if your Dalmatian molly is pregnant.