Black Mustard Betta Fish


Black Mustard Betta Fish are a stunning variety of Betta fish that are highly sought after for their striking black and yellow coloration. They are known for their long flowing fins and graceful movements, making them a popular addition to any aquarium. Originating in Southeast Asia, these fish are a member of the Osphronemidae family and are scientifically known as Betta splendens.

While Black Mustard Betta Fish may appear delicate, with proper care and attention, they can live for up to four years in captivity. In this blog, we will dive deeper into the fascinating world of Black Mustard Betta Fish, discussing their ideal tank conditions, nutrition, breeding, and much more. Whether you are a seasoned Betta fish enthusiast or just starting out, this guide will provide you with everything you need to know about caring for Black Mustard Betta Fish.

Key Information: Black Mustard Betta Fish

Topic Information
Lifespan 2-4 years
Temperature 78-82°F
Min Size 2.5 gallons
Max Size 3 inches
Species Betta splendens
Family Osphronemidae
Scientific Name Betta splendens
Origin Southeast Asia
Diet & Nutrition Pellets, flakes, frozen/live food
Breeding Bubble nest builders, egg layers
Tank Mates Small, peaceful fish
Tank Size 5-10 gallons
Average Price $10-30

History and Origin of Black Mustard Betta Fish

Betta fish originated in Southeast Asia, specifically in the Mekong Basin, where they were first used for fighting. The first Betta fish were brought to Europe in the 19th century, where they quickly became popular as ornamental fish. Since then, Betta fish have been selectively bred to produce a wide range of colors, patterns, and fin types. The Black Mustard Betta Fish is a relatively new variety, which was first bred in Thailand. It is a result of selective breeding between black and yellow Betta fish, which has resulted in a fish with a striking black and yellow coloration.

Black Mustard Betta Fish Characteristics

Black Mustard Betta Fish have a unique black and yellow coloration, which gives them a striking appearance. Their fins are long and flowing, which is typical of most Betta fish varieties. They can grow up to 3 inches in length and have a lifespan of 2-3 years. Unlike other Betta fish varieties, Black Mustard Betta Fish do not change color as they age.

Keeping Black Mustard Betta Fish

Keeping Black Mustard Betta Fish requires a bit of effort and attention, but it is well worth it. Here are some tips to keep your Black Mustard Betta Fish healthy and happy:

Setting up an Aquarium

Black Mustard Betta Fish can be kept in a tank as small as 5 gallons, but a 10-gallon tank is recommended. The tank should have a filter and a heater to maintain the water temperature between 76-82°F. The tank should also have a lid, as Betta fish are known to jump out of their tanks.

Water Conditions Black Mustard Betta

Fish require clean water to thrive. The pH of the water should be between 6.5-7.5, and the water hardness should be between 2-10 dGH. Betta fish prefer slightly acidic water, so adding some driftwood or Indian almond leaves to the tank can help lower the pH. The water in the tank should be changed at least once a week, and the filter should be cleaned once a month.

Diet and Feeding

Black Mustard Betta Fish are carnivorous and require a high-protein diet. They can be fed with Betta-specific pellets or flakes, but they should also be given live or frozen food such as bloodworms or brine shrimp. Overfeeding Betta fish can lead to health problems, so it’s important to only feed them once or twice a day and remove any uneaten food.

Tank Mates

Black Mustard Betta Fish are aggressive towards other fish and should be kept alone in their tank. They can be kept with snails or shrimp, but only if the shrimp are not small enough to fit in the Betta’s mouth.

Common Health Problems

Black Mustard Betta Fish are prone to several health problems such as fin rot, ich, and velvet disease. These diseases are usually caused by poor water quality, so it’s important to maintain clean water in the tank. If you notice any signs of illness, such as lethargy, loss of appetite, or discolored fins, consult a veterinarian or a fish expert.

Breeding Black Mustard Betta Fish

Breeding Black Mustard Betta Fish requires a separate setup for the breeding process. The breeding tank should be at least 10 gallons and have a heater and filter. The water should be kept at a temperature of 80-82°F and the pH should be between 6.5-7.5.

Mating Process

The mating process starts by introducing the male and female Betta fish into the breeding tank. The male will begin to build a bubble nest using his saliva and air. Once the nest is complete, the male will start to court the female by flaring his fins and swimming in a circular motion. Once the female is ready to mate, she will show vertical stripes on her body. The male will embrace the female and fertilize her eggs as she releases them.

Care of the Eggs

After mating, the female should be removed from the tank as the male will tend to the eggs. The eggs will hatch in 24-48 hours, and the fry will start to swim freely after 3-4 days. The male should be removed from the tank once the fry are free-swimming, as he may eat them.

Raising the Fry

The fry should be fed with infusoria or newly hatched brine shrimp for the first week, after which they can be fed with finely crushed flakes or pellets. The water in the breeding tank should be changed frequently, and any uneaten food should be removed. After 6-8 weeks, the fry will start to develop their distinctive black and yellow coloration.

Can Black Mustard Betta Fish change color?

One common question that Betta fish owners have is whether or not their fish can change color. While it is not common for Betta fish to change color completely, they can experience some slight color changes throughout their lives. Black Mustard Betta Fish are no exception to this, and they may experience changes in their yellow and black coloration. For example, stress or illness can cause a Black Mustard Betta Fish to appear paler, while a healthy fish will display more vibrant colors. Additionally, some fish may develop more intense coloration over time as they mature. However, it is important to note that drastic color changes can be a sign of illness or poor water conditions, so it is essential to monitor your fish closely and ensure they are living in a healthy environment.

Can Black Mustard Betta Fish survive in a tank without a heater?

Black Mustard Betta Fish, like all Betta fish, are tropical fish and require a specific temperature range to thrive. They are typically kept in aquariums with temperatures ranging from 78-82°F. Without proper temperature regulation, Betta fish can experience a range of health issues and may even perish. While it is possible for Betta fish to survive in colder water, this is not recommended as it can lead to a weakened immune system, lethargy, and other complications. Therefore, it is crucial to provide your Black Mustard Betta Fish with a suitable aquarium heater to maintain a consistent temperature range. It is also important to use a thermometer to monitor the water temperature regularly and ensure that it remains within the desired range. By providing your Black Mustard Betta Fish with a healthy and stable environment, you can help them live a long and happy life.

How long does it take for Black Mustard Betta Fish to mature?

Black Mustard Betta Fish, like other Betta fish, go through several stages of development before reaching maturity. Typically, Betta fish reach sexual maturity between 4 and 6 months of age. At this stage, they will begin to exhibit the characteristic behaviors of a mature Betta fish, such as building bubble nests and displaying their vibrant colors to attract a mate. However, while they may be sexually mature at this age, they will continue to grow and develop for several more months. In fact, it can take up to a year for a Betta fish to reach their full size and display their most vibrant colors. Proper nutrition and a healthy living environment can help ensure that your Black Mustard Betta Fish reaches maturity at a healthy rate and displays their most beautiful colors.

What are the ideal tank mates for Black Mustard Betta Fish?

When it comes to selecting tank mates for Black Mustard Betta Fish, it’s important to keep in mind that they are territorial fish and may become aggressive towards other fish, especially those with similar body shapes and coloring. It’s generally best to keep Black Mustard Betta Fish in a tank by themselves, or with a few carefully chosen compatible species. Some good options for tank mates include small, peaceful fish such as Corydoras catfish, neon tetras, or guppies. It’s important to select fish that are of a similar size and temperament to your Black Mustard Betta Fish, and to avoid species that may nip at their long, flowing fins. Additionally, it’s essential to ensure that your tank is large enough to accommodate multiple fish comfortably, and that there are plenty of hiding places and swimming spaces to reduce the likelihood of territorial disputes. With careful planning and monitoring, it’s possible to create a peaceful and vibrant community tank that includes your beloved Black Mustard Betta Fish.


In conclusion, Black Mustard Betta Fish are a stunning and unique addition to any aquarium. Their vibrant black and yellow coloring, long flowing fins, and graceful movements make them a highly sought after species among fish enthusiasts. As with any fish, it’s important to provide them with a healthy and stable living environment to ensure that they thrive. This includes maintaining the appropriate temperature range, feeding them a varied and balanced diet, and keeping the water clean and well-oxygenated. While Black Mustard Betta Fish are known for their territorial behavior, with careful planning, it’s possible to create a peaceful and thriving community tank. Whether you’re a seasoned Betta fish owner or just starting out, Black Mustard Betta Fish can provide endless joy and fascination, and with the tips and information provided in this guide, you can ensure that your fish will live a long and healthy life.


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