How to know if betta fish is male or female? (8 signs)

In this post, we will learn how to determine the differences between a female and a male betta fish. 

How to know if betta fish is male or female? (8 signs)

The gender of a betta fish is usually straightforward, however, it might be difficult to tell if it’s male or female. You can tell your betta’s gender by looking at the following traits. Be aware of the fact that immature fish may not show any signs of sexuality.

The best way to identify gender is to look at adult animals of the same species and color, and then compare several different traits to that attribute.

Male betta fish

When compared to other tropical fish, male bettas are tiny. The mature size of several other species is significantly larger. As a rule, you’ll see them on their own rather than in a group. Sadly, the hostility extends to another male of their species as well. Anything that is not eaten first by them is rapidly devoured by them as carnivores.

The fins of male bettas, which are the most prominent characteristic, are also a worry. For the most part, their primary function is to attract a partner and demonstrate their masculinity to other males. They can also be a problem.

Slow-swimming fish because they require a lot of energy to move. There is a greater chance that they may be nipped, which increases their risk of infection and sickness.


It is well known that male bettas can be hostile toward other male bettas. As a pet, that’s part of what makes it so appealing. There is a lot of huffing and puffing and movement in the exhibition they put on. If you weren’t familiar with their conduct, you’d assume it was unnecessarily dramatic.

Aside from the fact that this behavior is necessary for survival, it serves an evolutionary function. It’s a fight for your life or death. Male bettas hunt other smaller fish as predators.

All things considered, they’re just food. Even though he can’t swim very quickly, he’s a fierce hunter nonetheless. While you may keep him with other fish, it’s better not to place him in a tank with docile species, such as guppies or zebrafish. Keep it in a tiny tank by himself rather than with a bunch of different species.

Healthy and Well-Being

A male betta’s health and well-being are largely dependent on the tank’s setup. With no temperature control, you’ll find them in bowls that hold less than a quart of freshwater, which is common. This variable is influenced by the surrounding environment.

As it stands, this is arguably the worst conceivable scenario for these fish. The stability of both water temperature and chemical stability is a part of the problem. An animal accustomed to a constant temperature will suffer if the temperature fluctuates. The quality of the water is also a source of worry. In a tiny bowl, waste and its hazardous byproducts quickly collect. Instead, a big aquarium equipped with a heater and filtration system is perfect.

Per gallon of water, allow for an inch of fish. This may seem excessive, but it guarantees that the filter can handle the ammonia and nitrites released into the tank by the fish’s waste.

A hazardous bacterial environment can be created if the numbers are too high, displacing oxygen and causing your betta to die. Although it’s simple to remove the unclean water and replenish the bowl or aquarium, it’s not as simple as that.

It’s critical to keep in mind that fish are accustomed to a constant, predictable environment. In a lake, think of freshwater creatures. In the short term, the water chemistry isn’t going to change much. Stress and the danger of sickness are exacerbated by dramatic alterations in one’s environment. That is part of what makes an aquarium a superior alternative for your male betta or any tropical fish species.

Males, rather than females, are the ones that take responsibility for the breeding. It is common for them to make bubble nests to safeguard the eggs of the mother. The evolutionary theory supports this.

Female betta fish

It is common for female bettas to exhibit the same spectacular color patterns as their male counterparts, but without the lengthy fins and show of a battling fish.

Because of this, they are slightly smaller in size. As a result, the females can move around the tank more quickly than the males, who have a lot more muscle mass.

Sexual dimorphism refers to the differences between the sexes. The so-called egg spot, which may be found slightly beneath the ventral fins of female bettas, is another way to identify them as females.

The fins are the most important feature to check for when trying to determine the gender of your fish. The beards of both sexes may be found on their gills. It is a part of the show that they put on for the other members of their species to use this function.


Female bettas may coexist with males under some circumstances. In an aquarium with other fish, they are at their finest. Keep two people together, and you’re going to get into problems. They will behave like males, but without the fins to draw attention to themselves. The struggle for female domination is common. As a result, food and survival are frequently linked.

The condition of their fins is also a problem. They can grow to be rather lengthy, making them a tempting prey item for predators. Female bettas should be housed with fish that are less aggressive.

Health and Well-Being

The same criteria for the aquarium setup for male bettas apply to females, as well. For best water quality, they necessitate a regulated environment with frequent maintenance. In a  fish tank, you should prevent unexpected temperature or chemical fluctuations.

Stable conditions may be maintained by using a filter and heater. One of the most important characteristics is that bettas have a distinct feature. They’re able to take in oxygen from the water’s surface and exhale it.

When it comes to water quality, they have an advantage since they are more tolerant of poor conditions. We, on the other hand, recommend a correct arrangement for the fish’s well-being.

Characteristics that distinguish male and female Betta fish  (8 signs)


Even though males tend to have more vibrant colors than females, it is not always possible to tell a person’s gender just by looking at their skin tone. In general, males have more vivid colors than females, but females can also be quite colorful.

Vertical stripes

Female bettas have vertical stripes on their bodies when they are ready to mate, however, males don’t display this trait.

The shape of the Body

Female bettas tend to be somewhat smaller and wider-bodied than males. Males tend to have more extended bodies that are somewhat flatter, side-to-side.


It is not uncommon for male bettas to develop fins that are three or four times longer than those of their female counterparts. Although the males of some betta species display small caudal (tail) fins, the females of most species have larger caudal fins. They are notably longer and thicker in the males than in the women.

Egg spot

Mature females have an “egg spot” between the ventral and anal fins. The ovipositor is what’s utilized to lay the eggs, as the name implies. Males rarely show an egg spot.


The opercular membrane is the membrane that covers the gill plates of bettas. When the fish flares its gill plates, this membrane looks like a “beard.” The beard of the male is significantly longer and thicker, and it can be seen even when he is not flaring. 

When bettas are agitated, the sexes’ differences become more noticeable. Males display a large beard, while females have a much smaller, less pronounced beard. When flaring, females may also adopt a head-down posture, which males do not.


In comparison to male bettas, females aren’t nearly as violent, but it doesn’t mean they won’t attack other fish. When there are just two women and one of them is a bully, it may be quite distressing.

Therefore, maintaining more than one is advised to have at least five females so that aggressive behavior may be spread out and not be focused on one person in the tank.

Bubble nests

In most cases, male bettas are the only ones to produce a bubble nest. This is a nest formed of saliva bubbles that the fish makes on the surface of the water to protect the eggs during breeding.

In certain cases a female may use her breath to create an artificial bubble nest, thus this isn’t always the case. However, these are extremely unusual occurrences.

Although they don’t have a mate in the tank, males build bubble nests in preparation for breeding with a female.


In this post, we learned how to determine the differences between a female and a male betta fish. 

If you have any thoughts or doubts, feel free to drop us a comment below!

Frequently Asked Questions (FAQs): How to know if betta fish is male or female? 

How can I tell if my Betta fish is a male or female?

A betta fish’s gender may be determined in a few different ways. For the most part, male Betta fish are known for their long dorsal (top), ventral, and caudal fins. Usually 2-3 times or more their height. Since the fins are so long, they are more likely to fall.

Betta fish with shorter fins than their male counterparts are known as “female Bettas.”The answer to this question is yes, as long as there is only one of each.

Can a male and female betta fish live together?

Due to mating season, you’ll need to keep an eye on your male and female bettas for the whole time they’re in your care. Aside from reproducing and selecting one of the several species that can coexist with bettas, we advise against it.

Are two female bettas compatible in captivity?

Is it possible for Betta fish to coexist with females? As a result, two female bettas can coexist peacefully in the same aquarium. Betta females may even develop a “pecking order” with other species of fish and get along with them.

Is it possible to have two bettas living together?

If both bettas are female, you can keep them together. A fight to the death is almost certain to ensue if two guys are kept together.


How to Tell Male vs Female Betta Fish Gender? (9 Signs)

Male vs Female Betta Fish: Appearance & Behavior Differences

Male vs Female Betta Fish: Visual & Behavioral Differences

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