Detailed Guide on How Long Are Betta Fish Pregnant 2022

How Long Are Betta Fish Pregnant

Do you have a betta fish with you? If yes then you might be wondering for how long are betta fish pregnant?

There’s many different types of fish in the world, and if you have a fish tank at home, it is important that you are knowledgeable about all things fish. The first thing to keep in mind is that not all fish species can coexist peacefully. The fundamental characteristics of fish behavior, in fact, will be heavily influenced by the species.

Is your fish expecting a child? If that’s the case, how long do fish stay pregnant? Continue reading this blog to learn everything there is to know about fish pregnancy, such as fish incubation period and how to tell if your fish is about to give birth.

Also Read : Detailed Guide on How To Make Female Betta Produce Eggs

How are female betta fertilised?

The female Betta doesn’t quite give birth to live offspring, as we all know. Her eggs, like those of other marine species, are laid and instantly fertilised by the male Betta. The female Betta fish is not a caring mother, and the male Betta fish is solely responsible for the rearing of her offspring. A female Betta fish is classified as a spawning fish’ (her eggs are laid and afterwards fertilised by the male), which means she will never again be pregnant. In saying that, a Betta fish does carry her eggs for a brief period and seems to be bloated, just like other species that give birth to live babies. The term ‘gravid’ refers to a Betta fish that is simply holding eggs. When a Betta fish is pregnant, several people often refer to it as “being pregnant.”

Betta Fish Conditioning Before Breeding:

Before attempting to repopulate your Betta fish, it is critical to condition them. A healthy fish is much more likely to lay eggs that will hatch and become fertilised. You must always maintain a clean and comfortable environment for your Betta fish, but if you plan on reproducing them, now is the time to show them extra special love and care.

Provide nutrient-rich diets to your Bettas to help them plan for the breeding process. Bloodworms, brine shrimp, and earthworms are examples of live foods. When incorporating your female Betta to your male Betta, use a hurricane glass or a tank divider. This assists in understanding their interactions and predicting how the breeding process will proceed. Betta fish are unpredictable when it comes to breeding, thus safeguards should be taken whenever feasible.

What is the best way for fish to reproduce?

Fish can reproduce in one of two ways, depending on whether fertilisation occurs within or outside of the body. Fish can become pregnant in a variety of ways, including:

  • External fertilisation is used in oviparous fish, which implies that the female lays her eggs first, and the male fertilises them outside of the body. Based on the species, the eggs may be accumulated on the tank/bottom, ocean’s float, adhere to rocks or algae, seek shelter in nests, or be carried on the body.
  • Internal fertilisation occurs in viviparous fish, which means the male fertilises the eggs inside the female’s body. The fry are born fully formed.
  • Ovoviparous fish use a different method of internal fertilisation. The female will retain the eggs within her body after mating, in which the baby fish (fry) will grow. Either the eggs will emerge in the body or they will be ejected first.

In the case of internal fertilisation, we’re talking about fish pregnancy. However, when it comes to fish giving birth in aquariums, it’s crucial to be clear about which species of fish we’re talking about, as fish pregnancy varies greatly depending on the species. Betta fish are oviparous fish. The fertilisation occurs outside of the body. Hence the method is different for breeding.

What are the signs that female betta are pregnant?

Female Bettas, like male Bettas, display symptoms of being reproductive, although the signs are very different.

Stripes: Seeing if stripes have appeared on your female Bettas skin is the greatest way to tell if she’s able to breed. Vertical stripes are usually white or a lighter variant of the fish’s primary colour. Remember that longitudinal black lines are a sign of a problem, and you may need to make some changes in your Bettas tank to start making them happier. Streaks will appear in clusters of 5 or 6 at a time.

Does every betta show stripes?

No, not all female Betta will stripe, but you can easily inspire them to stripe by keeping them close to the male Betta. Please be extremely careful by putting your female Betta in a small box or bag at the very top of the aquarium . You can also buy an aquarium with a separator, but I would not recommend keeping the Bettas together for long periods of time because it can stress them out.

Is there anything else that indicates the Female Betta is ready?

The ovipositor is a white dot/tube found on the female betta’s abdomen. When she is ready to reproduce, the ovipositor will become apparent.

How to know if betta fish are fertile?

There are a few distinct signs and symptoms that indicate whether or not your Betta fish is ready to lay eggs. A fertile Betta fish will have white vertical stripes on her body while she is laying eggs, but a male who is able to mate would create bubble nests in his tank. If your male Betta has built a bubble nest, now is the moment to put the female into the tank. If the female Betta thinks the nest is perfect, she’ll let the male release the eggs out of her ovipositor. Lastly, If the female Betta isn’t satisfied with the male’s efforts, she’ll let him know by demolishing the bubble nest.

You may detect a round white spot on the tummy of your female Betta fish if she is already carrying her eggs. This patch is known as an ovipositor, and it is an egg-laying organ found among her ventral fins. Her eggs will be released from the ovipositor shortly. A pregnant Betta’s belly will show up full and bulging on the bottom. It is critical to distinguish between a pregnant Betta and a constipated Betta.

Any unused eggs in a female Betta fish’s aquarium will be ejected if she does not mate with a male Betta fish. If this happens, your Betta fish may appear less swollen. Betta fry will not hatch if the eggs are not fertilised.

You can presume your Betta fish is carrying eggs if she is swollen, has white stripes, and a visible white dot (ovipositor). It’s vital to keep in mind that just because your female is carrying eggs doesn’t mean she’ll give birth to fry. Both the male and female Bettas must be able to breed, and even if they are, Bettas are often picky about who they mate with.

How to know if the mating process was successful?

If you’ve put the female in the male’s tank, you’re probably wondering how to know if the mating was successful.

You might be able to see tiny particles in the male’s bubble nest if the mating process was successful. If these streaks continue to expand in magnitude, there’s a good chance you’ll be accommodating tiny fry into the fish tank before you know it. When you think the mating procedure is through, remove the female Betta right away. The male develops a strong attachment to the bubble nest and will not hesitate to defend it against intruders.

How long does it take betta to carry eggs?

In around 3 days, the baby betta fish will emerge. Male betta fish will monitor and stay under the bubble nest while the eggs hatch, capturing any that fall out. The babies are called “fry” once they break and are very small. Neither parent will look after the babies; they will fend for themselves as they grow. The male betta will only take care of them when they are eggs. He will eat any rotten egg to save the rest.

Important Information About Betta Fish Breeding:

  • Betta fish females do not give birth to live young.
  • When a male Betta is ready to breed, he will construct a bubble nest.
  • Betta’s eggs are extracted by the male Betta.
  • The male Betta fish in the bubble nest looks after the offspring.
  • Betta mating can be a complex and time-consuming process.


After all of this, it’s easy to mistake a fertile Betta for a pregnant Betta, but don’t panic; if your female Betta is willing to place her eggs, it’s fine to just let her do so without a male present. It simply implies that the eggs will “fry” rather than hatch.

It’s crucial to note that a Betta cannot become pregnant.

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