How To Tell If A Goldfish Is Pregnant

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Goldfish are known for their friendliness and quick wit, but did you know that they can reproduce? When the time comes to lay fertilized eggs or give birth live young there is no second-guessing your fish’s decision.

Goldfish are known for being an unusual breed of fish that does not have live babies. Instead, their young grow into adulthood after birth and start swimming around with the others as soon they’re born.

Goldfish eggs will remain outside of the gold ceiling until they hatch. When baby fish become free-swimmers, it’s time for them to explore their new world. But how to tell if a goldfish is pregnant?

How To Tell If A Goldfish Is Pregnant

How To Tell If A Goldfish Is Pregnant

Goldfish can be tricky to breed, so it’s important to know how to tell if a goldfish is pregnant.

The most common way to tell if a goldfish is pregnant is by looking for eggs in the female’s vent. The vent is located between the anal fin and the tail, and it should be slightly swollen during pregnancy. 

You may also notice that the female’s belly is swollen and that she is eating less than usual.

If you are not sure if your goldfish is pregnant, you can take her to a vet for an ultrasound. This will give you a definitive answer as to whether or not your fish is carrying eggs.

How to Determine if Your Goldfish Is Pregnant

Goldfish are a type of fish that can live for long periods without needing care, but they’re also known as rapid breeders. If you notice your goldfish has been getting taller and perkier than usual or she’s pregnant before too much time passes then there may be an egg growing inside her! Here I’ll tell you 5 things you can observe to know how to tell if a goldfish is pregnant:

Your Goldfish’s Belly Looks Rounder Than Usual

When a goldfish is pregnant, its belly will start to swell as the eggs develop. This can make the fish look noticeably rounder than normal.

Your Goldfish Is Eating More Than Usual

Pregnant goldfish tend to have increased appetites as their bodies need extra nutrients to support the developing eggs.

Your Goldfish Is Hiding More Than Usual

Pregnant goldfish may start to spend more time hiding away, as they instinctively know they are more vulnerable and need to protect themselves.

Your Goldfish’s Fins Look Different

The fins of a pregnant goldfish may look slightly different than usual due to the increased blood flow and hormones.

You See Eggs In Your Goldfish’s Tank

If you notice any small, round eggs in your goldfish’s tank, this is a sure sign that your fish is pregnant! These eggs will hatch within a few days, so be prepared for lots of new baby goldfish soon.

When Viewed From Above, The Belly Is Lopsided

From beneath, it’s easy to see that this fish has one side of her body more inflated than the other. It may be due to an egg yolk filling up one half or simply just being fat-so there are many factors at play here.

If you think your goldfish may be pregnant, it is important to provide them with extra care and attention. Make sure to give them plenty of food and hiding places, and keep an eye on the eggs so they don’t get eaten by other fish in the tank. With a little bit of love and care, your goldfish will be able to safely raise her babies.

Summarizing the most important points on how to tell if a goldfish is pregnant, there are a few key things to look for:

  • First, you’ll want to check for a gravid spot, which is a dark patch on the underside of the fish near the vent. 
  • Next, you may notice that the female’s belly is swollen and her scales are standing out more than usual. 
  • Finally, the female may be chasing other fish more aggressively than normal. If you notice any of these signs, it’s a good idea to take your goldfish to the vet for a confirmatory ultrasound.

Myths Regarding Goldfish Pregnancy

  • One of the most common myths about how to tell if a goldfish is pregnant is that goldfish lay their eggs in the water and then leave them there to fend for themselves. This is not true.
  • In nature, female goldfish will actually incubate their eggs in their mouths until they are ready to hatch. The female will then release the fry into the water, where they will be cared for by the parents.
  • When a fish sits at the bottom and doesn’t move for a while, it’s because they’re pregnant, it’s not a safe way how to tell if a goldfish is pregnant.
  • The pregnant females stay close to shore in order not to be eaten by predators that swim up from below while nurturing their unborn young with nutrients stored away just before giving birth.
  • Female goldfish are known for showing “nesting behavior” when they’re ready to give birth. They build an egg-filled nest out of anything on hand, including toilet paper rolls.
  • Another common myth is that goldfish pregnancy is very dangerous for the mother. This is also not true! In fact, goldfish pregnancy is actually quite safe for the mother, provided she is in good health and has access to plenty of clean water.
  • Finally, some people believe that goldfish pregnancy is only possible if the fish are kept in an aquarium. This is also not true! Goldfish can successfully reproduce in both ponds and aquariums. However, it is important to note that goldfish reproduction is much more successful in ponds due to the presence of other fish species that can help care for the fry.

Is it Possible for a Goldfish to Be Pregnant?

Yes, a goldfish can really be pregnant! This is because goldfish are oviparous, meaning that they lay eggs.

When the female goldfish is ready to lay her eggs, she will release them into the water where they will be fertilized by the male goldfish. The eggs will then hatch and the baby goldfish, called fry, will be born. So, if you see a goldfish with eggs in her belly, she is definitely pregnant.


Now that you know how to tell if a goldfish is pregnant, you can provide the extra care and attention she needs during this exciting time. Just remember to keep an eye on the eggs so they don’t get eaten by other fish in the tank, and be prepared for lots of new baby goldfish soon.

Thankfish for reading!

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