What type of betta fish is black and yellow?

In this post, we will answer the question “What type of betta fish is black and yellow?”. We will also discuss the betta fish type’s main characteristics and requirements.

What type of betta fish is black and yellow?

Mustard gas is the name given to the variety of betta fish that is black and yellow and is quite difficult to come across. Appreciated by many aquarists, this betta variant attracts attention because of its brilliant and eye-catching hues.

What is a mustard gas betta?

The mustard gas betta is a very beautiful variation of the betta fish species. These fish are bi-hued or, in some cases, multi-coloured bettas, with distinct coloured ends and bodies on their bodies and fins. 

The body of the fish is often dark in colour, and it is usually blue or green in hue. A variety’s name comes from the colour of the flowing fins, which is often orange or yellow and spreads forth from the body in cloud-like waves, hence the name. 

Because the fin colour is similar to chocolate, the variety is sometimes wrongly called fish as chocolate. The chocolate variety of the betta, on the other hand, has a brown body. The mustard gas betta is also known as the paradise betta in certain circles, although this is simply another name for the same kind of betta.

What is the size of a mustard gas betta fish?

Bettas of this species can grow to be roughly three inches in length at the most, though many are much smaller. Bettas of this species can be found in a variety of colours. The rate at which your fish grows is determined by its genetic composition and lineage.

What about lifespan?

Betta fish may be anticipated to live for three to five years on average, however, they can live for much longer periods in exceptional situations. Your pet’s longevity will be influenced to some part by how effectively you take care of his tank and the quality of the food you feed him, among other factors.

Mustard gas origins

The first appearance of this betta was in 1999 when a breeder from the United States named Jude Al brought the fish to the sport. The production of Al’s “pure” betta took him 13 years, according to him. The majority of these fish are currently created by cross-breeding or through imitation of other species. 

This species is mostly bred in Southeast Asia, and most betta aficionados agree that the present supply has been significantly depleted compared to the original fish population.

Are mustard gas bettas rare?

One of the most unique things you may discover is a mustard gas betta that is directly derived from those that were first bred around 20 years ago. The majority of the fish you see these days are hybrids created by crossing a male mustard gas betta with a female of another species to produce offspring. 

Many of the fish sold as mustard gas bettas are just bi-coloured fish with tail colours and tones that are similar to those of the genuine mustard gas fish. 

Indeed, it’s a good thing that enthusiasts started out-crossing this betta species since it means we now get to see this uncommon fish in a variety of beautiful hues, which is a rare and beautiful sight.


Unlike the male of any other betta fish species, the mustard gas betta is fiercely territorial and exceedingly violent toward other males of the same species. When housed alongside fin nippers, which would make a feast of the betta’s fins, this species does not fare as well as it might. 

Bettas are quite energetic swimmers, and they spend a lot of their time monitoring the waters around their home patch. In addition to being beautiful centrepiece specimens, these fish may coexist peacefully in a tank with a few tiny, friendly buddies who do not annoy the betta. Corydoras catfish, for example, are excellent tank mates since they live at the bottom of the tank.

Tank requirements

Betta fish are not very picky when it comes to their needs in terms of upkeep. Although you do not need to supply your fish with a large enough tank, you should avoid using bowls or vases since they are not suited for betta fish. As a result, you should invest in a tank that is suitable for your betta, such as the ones illustrated in this article. 

Bettas are surface feeders as well as labyrinth breathers, which means that they must come to the surface of the water to breathe regularly. In addition, mustard gas betta fish have luxuriant, flowing hefty ends that are difficult to catch. It is therefore advisable for these creatures to swim in a shallow tank to avoid exerting excessive effort in getting to the water’s top. 

During the dry season, wild bettas can leap when they need to migrate between different water bodies to survive. Domesticated bettas are also capable of jumping, which necessitates the use of an aquarium with a cover slide or lid.

Water parameters

Bettas are tropical fish that require water temperatures ranging from 72° to 82° Fahrenheit to survive. In addition, the water temperature must remain steady, because bettas are extremely sensitive to temperature changes. A heater and an aquarium thermometer will be required so that you can keep track of the temperature of the water in your aquarium. 

The pH of the water should be between 6.0 and 7.5, and the hardness of the water should be between 2 and 12 dKH.


Your betta fish’s health is dependent on having clean water. As a result, you must install a high-performance filtration system in your pet’s tank. 

You’ll also need to perform partial water changes once a week and vacuum the substrate with an aquarium vacuum to keep your aquarium in good condition.

Diet and nutrition

The natural diet of bettas is composed mostly of meaty protein in the form of insects and insect larvae, with a tiny quantity of plant matter as a supplement. Bettas are categorised as omnivores in the scientific community. 

The most important thing to remember about feeding your betta is that it should have a base diet of betta pellets and tropical flake supplemented with frozen or live bloodworms, daphnia, brine shrimp, and other meaty proteins. In an ideal situation, you should feed your fish twice daily, providing only what the betta would consume in a matter of minutes. 

Include one day every week where you don’t feed your fish at all in your weekly schedule as well. It is on this fasting day that your fish’s digestive system can handle the food in its stomach without getting overburdened and clogged. Adding a fasting day to your betta fish’s weekly feeding schedule will help to minimise constipation and bloating, which are typical concerns with this species. 

Where can I get a mustard gas betta fish?

Mustard gas betta fish are incredibly popular, but they are also in short supply. Consequently, this kind of fish is fairly difficult to come across. 

Betta breeders that specialise in the production of these unusual fish are the greatest sources for purchasing them. Try searching on Pinterest, other social media pages, breeder’s blogs, and online auctions, however, you’ll have to deal with the trouble of international shipping if you want to find a dog in another country. 

It is possible to obtain mustard gas bettas for sale at fish stores from time to time, albeit they are frequently faked and not the real articles. That being said, if you are only concerned with the appearance of the fish, breeding and genetics may not be a top priority for you.


In this post, we answered the question “What type of betta fish is black and yellow?”. We also discussed the betta fish type’s main characteristics and requirements.

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

Frequently Asked Questions (FAQs): What type of betta fish is black and yellow?

What is the most difficult to come by betta colour? 

It’s so uncommon that, like pure black bettas, many collectors aren’t even aware that they exist, let alone have seen one. When albino bettas are recorded or put up for sale, keen observers nearly always accurately identify them as transparent, cellophane, or white bettas, depending on their colouration.

Is it possible to find a black mustard Betta? 

Are mustard gas bettas an unusual occurrence? I’ll put it this way: yep! One of the most unique things you may discover is a mustard gas betta that is directly derived from those that were first bred around 20 years ago. The majority of the fish you see these days have been produced from a single male mustard gas betta and a female of another species, according to the fish industry. 

What does the world’s most endangered betta fish look like? 

The fantail kind of Betta is the most difficult to come by. This fish has two caudal fins that are side by side but fused at a little point at the top, giving it the appearance of a fantail goldfish, which is a close relative of this species. This kind is so uncommon that it is difficult to discover any information about them, let alone a place to purchase them. 

What is causing my yellow betta fish to become completely black? 

Stress, old age, accidents, and disease are all possible causes of colour loss in your betta. It is also possible for Bettas to lose colour on their own, especially if they carry the marble gene. As long as there are no other indicators of sickness in your betta, you shouldn’t be too concerned about their colouration changing.


Types of Betta Fish: Complete Guide on Color and Pattern Variations – https://modestfish.com/types-of-betta-fish/.

Young, T., & Bone, J. (2021). A better life for betta fish. Every Child, 27(2), 8-10.