How to Breed Betta Fish

Breeding Betta fish, also known as Siamese fighting fish or Betta (Betta splendens), is a highly rewarding and fascinating hobby. However, it’s essential to approach it seriously. If you have enough free time, financial stability, knowledge, and the dedication required for Betta breeding, it could turn out to be an incredibly valuable experience.

Learn as much as you can. When attempting to breed any animal, understanding the species in detail is crucial. Study how to care for and breed Betta fish. There are numerous excellent resources, both online and in books, dedicated to Betta fish. Over 600 eggs can be laid in a single breeding, meaning you'll need to care for more than 500 Betta fish when they hatch! You must know what you hope to achieve from this hands-on experience.

• Are you interested in genetics, breeding to showcase to others, or supplying to aquarium stores?
• Or do you simply love Betta fish and want to take your hobby to the next level?
• Breeding Betta fish to impress friends or supply to stores is a large-scale business that requires a significant investment in time, space, and money. Given the high start-up and operational costs, making a profit from Betta breeding can be challenging, so this shouldn’t be your primary goal initially.

Set up the fish tanks. Before bringing your breeding pair of Betta fish home, it’s important to prepare. Set up two tanks and make sure to run the water cycle in both tanks before introducing any fish.

Find a breeding pair of Betta fish. Betta fish breed most effectively when they are young. Therefore, your best chances of success are if you purchase your breeding pair from a reputable breeder, either online or locally. If you find a local breeder, they can be an invaluable source of information. Ensure that the male and female are of similar size, and consider purchasing two pairs in case one doesn’t work out.

• Most Betta fish in stores are too old to breed and have unclear genetic backgrounds, but this is a cheaper option to start breeding, and there are typically more readily available than specialized breeding stock.
• If you choose to breed fish purchased from a pet store, keep in mind that you may not find homes or buyers for the offspring, as most pet stores won’t purchase them. Since you’re unaware of the genetic origin of the Betta pair, you may end up with sickly fry, which no one wants.

Allow the fish to settle into their tanks. It’s best to let the Betta fish live in their tanks for a few months before starting the breeding process so they can acclimate to the water environment. Remember, male Betta fish are most fertile when they are under 14 months old. Plan the breeding for when you have an extended period of free time without interruptions.

• Once the male and female are introduced to each other, you’ll need to dedicate at least a few hours each day for two months or more to care for the pair and their fry. Ensure you don't have any holidays, business trips, or important events on the horizon.

Set up the breeding tank. The breeding tank should have a volume of about 19-38 liters and be equipped with a removable divider, hiding spots, an adjustable filter (e.g., a sponge filter with a valve for adjusting), and a heater set to 27°C. Avoid adding gravel or other substrates to the breeding tank, as eggs can get lost if they fall to the bottom. Fill the tank with only about 13-15 cm of water, and place it in a quiet area free from distractions, such as near other fish tanks, vibrant surroundings, or areas with frequent human activity.

Begin feeding live food when you're ready for breeding. Brine shrimp larvae or grindal worms are the best options, but insects such as crickets, cockroaches, and other bugs (chopped up) are also acceptable. Raising these foods yourself is a good idea or purchasing from pet stores or breeders to avoid contamination, dirt, and chemicals that wild insects may carry. If live food is unavailable, you can also try frozen live food.

Start raising food for the fry. Betta fry are extremely small and only eat live food, so you'll need a supply of very small live food for them once they hatch. Start preparing now to ensure you have a steady supply for the next few weeks when needed. Grindal worms are probably the best food, but some breeders prefer microworms or vinegar eels. Brine shrimp larvae are also good, but only in small amounts along with other food sources, as overfeeding can lead to swim bladder disorder.

Introduce the pair to each other. Once the live food feeding is stable and the breeding pair has been eating for a week or two, you’re ready to introduce the Betta pair. Move the male and female tanks close so they can clearly see each other but keep them separated. You can place their tanks side by side, or place them in the divided sections of the breeding tank. Allowing them to recognize each other is crucial before placing them together in the same tank to reduce the risk of severe injuries.

• Some breeders place the male in the undivided breeding tank and use a clear plastic cup or oil lamp cover to prevent the male from attacking the female. When using this method, the female should only be introduced for a few hours a day, as she’s confined to too small a space. Let them observe each other for several days to get acquainted.
• Other breeders continue to separate the pair for a few days before allowing them to see each other for a few more days, then proceed with the next steps.

Observe the fish's behavior. Watch the Betta pair to see if they seem to be attracted to each other. The male will swim in circles, flare his fins, and puff up his gill covers, often displaying himself. The female will show vertical bars on her body and lower her head in submission. A little aggression is normal, but if they flare their gills and attack each other even with a divider, don't place them in the same tank. Instead, it’s better to separate them and try again later or try with another Betta pair. Occasionally, Betta fish fight, so it’s best to take some time to observe and wait for the right moment.

Remove the divider. Once the male is ready to breed, he will build a large bubble nest within 2-3 days. When this happens, turn off the filter and introduce the female into the tank, but continue to closely monitor the pair. The male will likely bully the female, nipping at her fins and chasing her around the tank. This is perfectly fine as long as there is no serious harm. This initial period of acclimatization may last a few hours or days. Make sure the tank has plenty of hiding spots for the female to escape from harassment, and frequently check the pair to prevent serious injuries.

Let things happen naturally. The male will eventually coax the female to swim under his bubble nest, and they will embrace. It may take a few attempts for the eggs to appear. Afterward, the female will enter a 'motionless' state while tiny white eggs fall from her small white ovipositor. The male will swim down and collect the eggs, placing them one by one into the nest. Some females may assist once they recover, but others might eat the eggs, so be vigilant and separate the female if she starts eating the eggs. The pair may embrace a few more times, but gradually, the female will stop laying eggs.

Separate the female Betta. Once the female stops laying eggs, the male will continue to harass her, and she will try to hide. Gently scoop the female out and place her in a separate tank. Add Maroxy solution to the tank to help heal her fins. It's also a good idea to use Maroxy in the breeding tank to prevent fungal infections that could spoil the eggs.

Leave the male in the tank until the fry hatch and are swimming. This process takes about three days after fertilization. Some breeders may choose not to feed the male during this time to reduce the risk of him eating the eggs and fry. Other breeders may feed the male small amounts of food every two days. If you decide to feed the male, don’t worry if he doesn’t eat right away—just continue adding food and gently siphon away any uneaten portions with a dropper. Avoid using a filter to prevent disrupting the fry, but make sure the lights stay on day and night.

Wait for the fry to hatch. As the fry begin to hatch, they will attach to the bubble nest, and the male fish will continuously replace the broken bubbles. After a few days, the fry will be able to "swim freely," moving horizontally and daring to leave the nest. Before leaving the nest, the fry will feed on the remnants of the egg yolk, as they cannot yet feed on their own.

Remove the male fish from the tank, being very careful not to accidentally scoop up any fry. The male can return to his usual life and feeding routine. If the male appears worn out after the courtship, add a small amount of Maroxy solution to the tank to help heal his fins.

Feed the fry. As soon as you remove the male, start feeding the fry small amounts of live micro worms. Feed them twice a day, paying close attention to how much they eat. If there is leftover micro worm after the next feeding, skip that meal as the fry still have enough food. If you notice many dead worms, you're overfeeding; reduce the amount accordingly. The fry need live, tiny foods such as:

• Infusoria: Feed this during the first week of the fry's life;
• Micro worms: You'll need to purchase a batch initially, and they will reproduce on their own. They are suitable for fry from 3 to 40 days old;
• Artemia nauplii: This is easy to hatch and feed, but overfeeding can lead to swim bladder disease;

Allow the fry time to grow. Keep the temperature at 27°C and cover the tank to prevent wind and evaporation. Gradually increase the amount of food added to the tank. When the fry outgrow the tank, they will need to be moved to a larger one. Not all fry will survive in the first few weeks, but if a significant number are dying, there may be a problem. Check the temperature, water chemistry, and consider disinfecting the tank.

• When the fry are one week old, turn on the filter but limit the water flow with an adjustable valve to avoid disturbance.
• When the fry are two weeks old, begin partial water changes (10%) every few days to keep the tank clean and prevent contamination from leftover food. Use a siphon or drip tubing carefully to avoid harming the fry, and slowly add fresh water. You may start turning off the tank lights at night.
• In the following weeks, gradually increase the strength of the filter’s water flow, observing the fry carefully to ensure they are strong enough to swim against the current.

Transfer the fry to a larger tank. When the fry are two weeks old, move them to a larger tank with at least 75L capacity. Ensure the temperature and water conditions in the new tank are the same as in the original tank where the fry were raised. The fry are very delicate—just one mistake can cause them to die. If you are using a tank filled only halfway, with a 19L or 38L capacity, you can add more water and transfer them when they reach 4-5 weeks old.

Transition from live food for the fry. When the fry are about one month old, you can begin gradually switching them to frozen foods, followed by dry foods and small pellet feeds. Make sure the food is finely ground so the tiny mouths can eat it. Offer small portions, and slowly wean them off live food. Always remove any leftover food from the tank.

Separate the males. When the male fry start fighting (usually around 5-8 weeks old), it's time to separate them from the tank. Place them in separate tanks next to each other, as they may become lonely if isolated suddenly.

• Non-aggressive males can remain with females until they show signs of aggression.
• Some males may refuse to eat for the first couple of days; try offering live food to stimulate their appetite.
• Continue separating all aggressive males. Over the following days and weeks, consider isolating them using opaque dividers, as they will stress each other, puff out their gills, and attempt to attack the neighboring males.

Decide the future of the fry. If you plan to sell the fry, you'll need to reach out to potential buyers. Most fry will begin displaying adult characteristics around the 10th to 11th week, and you can start selecting the best fish for future breeding or taking photos to send to prospective buyers. If you're working on a breeding line, you'll want to select the best fry from each batch for breeding, and either sell or give away the rest. Otherwise, you might find yourself overwhelmed by a population of Betta fish you can't manage.

Distinguish male and female Betta fish when young. This requires time and experience; even experienced breeders sometimes mistakenly put two males together in a tank.

• Males have longer fins, but when young, their fins are still short.
• Males puff out their gills when they are together. Females typically don’t do this, but they can be just as aggressive as males.
• The female has an egg spot located under her abdomen; this is where the eggs will be released during spawning.
• The male builds a bubble nest; if you place a Betta in a jar and it blows a bubble nest, it's a male. However, some females can also create bubble nests, so make sure to examine them closely.

• Không bao giờ cho cá con ăn thức ăn viên có sẵn vì chúng quá lớn và cá con sẽ bỏ ăn. Cá con sẽ chết đói hoặc bị giết bởi vi khuẩn sinh ra bởi thức ăn thừa.
• Hãy cẩn thận không hút nhầm cá con khi thay nước, chúng rất nhỏ và có thể không bơi ngược dòng nước được.
• Luôn loại bỏ thức ăn thừa trong bể cá con, nếu không chúng sẽ phân hủy và gây nhiễm khuẩn toàn bộ bể cá.
• Một số người gây giống cá sẽ đặt vài thứ vào bể để cá đực dễ làm tổ hơn, ví dụ như một cái ly nhựa xốp, một lá rau diếp hoặc những vật có thể nổi được khác.
• Trước khi định gây giống bất kỳ loài vật gì, hãy chắc chắn là bạn có kế hoạch cho đàn con. Một cặp cá Xiêm có thể đẻ 500 cá con, vậy nên hãy đảm bảo là có chỗ để cho chúng sinh sống.
• Cá con chất lượng cao đến từ cặp đôi cá có chất lượng cao. Nếu bạn có ý định bán cá con, thì rất đáng để đầu tư tiền vào một cặp cá Xiêm tốt.
• Nghiên cứu và học hỏi thật nhiều trước khi bắt tay vào gây giống cho cá. Có rất nhiều nguồn thông tin hữu ích trên internet, hoặc bạn có thể nói chuyện với người gây giống cá ở địa phương hoặc một chuyên gia nuôi cá cảnh.
• Luôn dùng vợt có mắt lưới nhỏ để vớt cá Xiêm. Vợt thông thường có thể làm rách vây cá.
• Nếu bạn tạo ra một dòng cá di truyền độc đáo, ổn định, hãy đặt tên cho giống đó để nhận diện sau này.
• Bạn có thể phải đưa ra những quyết định khó khăn về những con cá sinh ra bị dị dạng. Nếu chúng phải chịu đau khổ, bạn có thể cân nhắc việc cho chúng chết một cách êm ái nhân đạo. Đừng bao giờ gây giống cho những con cá dị dạng như vẹo cột sống hoặc vây bị biến dạng.

• Gây giống cho cá Xiêm đòi hỏi đầu tư rất nhiều thời gian, công sức, và tiền bạc. Đây không phải là một sở thích mà bạn có thể xem nhẹ.
• Khả năng xảy ra biến cố là rất cao kể từ khi bạn giới thiệu cặp cá với nhau cho đến khi cá con trưởng thành. Hãy sẵn sàng đón nhận thất bại trước khi bạn nắm được mọi thứ.
• Luôn cẩn thận khi sử dụng hóa chất hoặc thuốc cho bể cá. Thuốc có thể cứu mạng nếu dùng đủ và giết cá nếu quá liều. Luôn đọc kỹ bao bì và hướng dẫn sử dụng cẩn thận và không bao giờ dùng quá liều khuyên dùng.
• Những người gây giống trách nhiệm luôn nghiên cứu kỹ lưỡng về gien và những đặc điểm của cá và bảo đảm họ có chỗ cho cá con sống trước khi tiến hành gây giống. Việc gây giống mà không nghĩ trước có thể dẫn đến cả đàn cá không như mong đợi.
• Không gây giống cá Xiêm mắt kim cương dù dưới bất kỳ hoàn cảnh gì. Đàn cá này sẽ bị mù bẩm sinh.

• Two aquariums for adult Betta fish
• A 38L aquarium with a lid and lighting for breeding purposes
• A partition or lamp cover for the aquarium
• A heater to maintain water temperature at 27 °C
• A filter with mild suction power
• A siphon tube with gentle suction
• A drip tube
• A hiding spot (e.g., plants, PVC pipes, etc.)
• A net for catching shrimp larvae
• Medications like Maroxy, BettaFix, Ampicillin, or other healing treatments
• Live food (bloodworms or shrimp larvae)
• Food for baby fish (daphnia or infusoria)
• Frozen or pelletized food
• A tank for male fry (50-100 fish)
• A larger tank for adult fish (110-190 liters)