How Do You Know When Your Tropical Fish Is Pregnant?

Are you expecting some young fish in your tank? Although many fish lay eggs, there are a few species of fish that give birth to young fish, also known as fry. Here are a few questions to ask yourself when determining whether or not your fish is pregnant.

Is your fish a live-bearer?

Live bearing fish are the only tropical fish that become pregnant (other species of fish are egg-bearing and lay eggs in the tank). These are a few of the most common live-bearing fish that people keep in their home aquarium:

  • Guppies

  • Mollies

  • Swordtails

  • Platies

What gender is your fish?

You will also need to identify the gender of your fish. Males generally have bright colors, and a long, narrow fin on their belly. Female fish, on the other hand, usually have a triangular or fan-shaped anal fin on the bottom of their body.

Does your fish have a pregnancy bulge?

As your female fish becomes pregnant, she will grow a bulge at the back of her abdomen. This typically appears over the course of 20-40 days.

Does your fish have a red or black spot?

Sometimes, when a female fish is pregnant, she will develop a “gravid spot” on the abdomen. This is typically black or red in color -and grows more pronounced over the course of the pregnancy.

If you are looking to add a few new tropical fish to your tank or you need pet supplies for your fry, stop by our Mineola pet store!

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