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Maximum size : 10 cm

Spotfin Betta - Betta macrostoma : Complete Fish Profile & Care Guide

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The Spotfin Betta (Betta macrostoma) is a highly coveted and rare variation of the popular Betta fish. Unlike their more ornate captive-bred counterparts, these fish possess a distinctive appearance and personality that sets them apart. What makes the Spotfin Betta unique is their mouthbrooding behaviour, which is quite different from the bubble-nesting tendencies of other Betta varieties. Additionally, their peaceful demeanour makes them an ideal addition to any aquarium, but it's best to keep them in pairs or small groups in larger tanks. However, it's important to note that they can become territorial with other tank mates and should only be kept with their own species. Regarding their physical appearance, the Spotfin Betta boasts an elongated, torpedo-shaped body with short, round dorsal and tail fins. While the male is more vibrant and colourful, with a multicoloured dorsal fin and tail that resembles a Chinese brocaded fan, the female displays the familiar two horizontal bands commonly seen in Betta Splendens. In addition, their wider mouths make them a fascinating addition to any community aquarium, as they can even serve as a snack for other fish. Overall, the Spotfin Betta is a unique fish that captivates any aquarist's attention. Their distinct physical features and peaceful demeanour make them a rare and highly sought-after addition to any aquarium.

Spotfin Betta Photos

Sexual Dimorphism

Distinguishing between the genders of Spotfin Bettas is a relatively easy task. Male specimens tend to exhibit more prominent physical characteristics, such as a broader head shape, longer fins, and more vibrant and eye-catching colours. Additionally, males are generally larger than their female counterparts.

Quick Facts

Scientific NameBetta macrostoma
Year Described1910
Other NamesBrunei Beauty
OriginsMalaysia Indonesia
Max Size10 cm
Aquarium LevelMiddle - Top
DifficultyIntermediate - Advanced
Best kept asPairs
Lifespan3 - 5 years

Water Parameters

Water TypeFreshwater
PH4.5 - 6.5
GH2 - 10
TDS0 - 90
68 - 79
20 - 26.1

Natural Habitat

The Spotfin Betta is an enchanting fish species that inhabit the lush waterways of Borneo Island, where it can only be found in the northern tip of the Malaysian state of Sarawak and Brunei Darussala. These fish thrive in shallow, slow-moving, and shaded pools along the streams and rivers, where the substrate is composed of clay. However, they are also known to occupy quiet pools alongside the main joining of fast-flowing, clear waterfalls. The mesmerizing sight of these fish swimming in the tranquil waters is a delight for any aquarist.


Moving a pair of Spotfin Bettas to a separate breeding tank is a critical step towards successful breeding. Gradually increasing the water temperature by a few degrees and reducing the water level by a few inches while maintaining a 10% water change every couple of days encourages breeding behaviour. During spawning, males display a unique behaviour of wrapping themselves around the female several times, and as she lays eggs, the male fertilizes them. This activity can last up to five hours. After spawning, the female and male collect the eggs from the aquarium floor. Then, the male mouth broods the fertilized eggs until they hatch, which takes around 30 to 35 days. However, some people report a much shorter incubation time, between 12 and 17 days. It is crucial not to disturb the male while mouthbrooding, and the female should be left in the tank. Feeding or disturbing the male during this time can cause him to swallow the eggs. Once the fry hatch, typically between 10 to 20 of them, the female can be removed from the tank, and the male can be removed after two weeks. The fry will be large enough to accept motile foods like artemia nauplii and microworm immediately. Feeding small amounts of different foods daily helps increase the fry's growth rate, but overfeeding should be avoided as the babies can develop intestinal problems quickly. Additionally, performing small daily water changes prevents organic waste accumulation, ensuring a healthy environment for the fry's growth.

Diet & feeding

The dietary requirements of the Spotfin Betta are relatively simple. Once they recognize high-quality dried products as edible, they will typically accept them with ease. However, offering small live or frozen foods such as bloodworms, artemia, and daphnia regularly can significantly contribute to optimal condition and colour development. While occasional earthworms can be fed to more prominent individuals, it is vital to avoid overfeeding, as these Bettas are susceptible to obesity.

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