How Can You Tell if Your Goldfish Are Pregnant? Understanding the Breeding Process

Goldfish breeding - a separate breeding tank is necessary

Preparation for fry is important for their survival – separate breeding tank, filtration, food.

Goldfish Breeding Process – the facts

  • Goldfish are not livebearers, they lay eggs. This means they don’t produce live babies. Goldfish don’t get pregnant.
  • The goldfish breeding process can be complicated and owners who understand the process will better understand their goldfish.
  • You need to have a mix of male and female goldfish in order to produce babies.

Determining the sex of the goldfish can be difficult, but there are characteristics that can help distinguish the difference.

Male goldfish characteristics

  • Males are generally smaller
  • They have firmer stomachs than females
  • Pectoral fins of male goldfish are longer

Female goldfish characteristics

  • Pectoral fins of a female are shorter and rounder

Goldfish breeding signs

When female goldfish are ready for breeding, their stomachs will become rounder due to their stomach filling up with eggs. Some people believe this is how you can tell if your goldfish is pregnant.

Males develop white breeding tubercles on their gills during this same period.

The breeding process can be fascinating to watch and it may appear that the female goldfish could become pregnant in the process. However, the female actually lays eggs in clusters and the male swims over the eggs releasing sperm to provide fertilization.

goldfish breeding nursery

egg deposits should be removed from the tank and isolated from the other fish

Breeding tank and care for the goldfish fry

Carefully watch the goldfish for changes in behavior. If egg deposits are noticed, they should be removed from the tank and isolated from the other fish.The eggs will normally stick together and be easy to detect. If the eggs are left in the tank, other fish are likely to eat them.

The nursery tank – when babies are dropped by the female, they will fall through the slots in Slotted V-Trap, carried through the maternity connector and transfer tube and brought up into the nursery tank.

The nursery tank can then be lifted gently off the nursery platform and placed in a separate aquarium. Keep in mind the eggs need to be placed in a separate tank with a filtration system. A sponge or under gravel filtration system works best. This way when the eggs hatch, the fry cannot be sucked up into the filter.

Click here to buy under gravel filtration system.

After a short period of isolation, little fish will begin swimming in the new tank. If this happens, the breeding process was successful. It’s perfectly normal for only some of the fry to survive.

It’s best to feed the new fish powdered fry food or brine shrimp. Keep the tank clean and enjoy the view.

Preparation for the fry is important in terms of their needs for survival – separate tank, filtration, food. Once this is in place you can enjoy this fascinating lifecycle process of breeding goldfish.

This interesting video gives some great visuals on the process of goldfish breeding and shows the different stages fry hatching and growth.

Click here to buy an ‘aqua nursery’.

About Serena

My name is Serena Harris and I love learning about the different varieties of Goldfish. I also enjoy taking care of my goldfish and I look forward to sharing my experiences with you.
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