Spotfin Betta (Betta macrostoma) Fish Species Profile & Care Guide
The Spotfin Betta is one of the rarest and most expensive betta variations available and is somewhat less ornate in appearance than other captive-bred Bettas. They also have quite different personalities than many more popular varieties, such as Betta Splendens. These Bettas are mouthbrooders instead of the typical bubble nester.
The Spotfin Bettas are much more peaceful than their Betta relatives. However, males can still become somewhat territorial, these fish are best kept in pairs, but you can also house them in groups in larger aquariums. However, it would be best if you only kept them with their own species as they can become too territorial with other tankmates.
The Spotfin Betta has an elongated, torpedo-shaped body with short round dorsal and tail fins. The anal fin is only half as deep compared to betta splendens veil but the same length.
The male is more colourful. He is a brownish-tan colour, and his tail and dorsal fin are multicoloured and look similar to Chinese brocaded fans. The female has the two horizontal bands familiar to betta splendens owners. These Bettas mouths are wider than the usual Bettas as they are mouthbrooders and not bubble nesters.
|Scientific Name||Betta macrostoma|
|Other Names||Brunei Beauty|
|Aquarium Level||Middle - Top|
|Difficulty||Intermediate - Advanced|
|Best kept as||Pairs|
|Lifespan||3 - 5 years|
|Maximum Size||up to 10 cm|
|Temperature||68 - 79 ℉ (20 - 26.1 ℃)|
|PH||4.5 - 6.5|
|GH||2 - 10|
|TDS||0 - 90|
Origins of the Spotfin Betta
Spotfin Bettas are endemic to Borneo's island where it is known only from the northern tip of the Malaysian state of Sarawak and Brunei Darussala in Southeast Asia.
They inhabit the shaded very shallow slow-moving stagnant water in pools along streams and rivers with a clay substrate. You may also find them in waterfalls with fast-flowing clear water where they occupy small quiet pools alongside the river's main joining.
Other Bettas of interest
The Spotfin Betta will usually accept high quality dried products once they are recognised as edible. However, it would be best to offer them plenty of small live or frozen foods such as bloodworm, artemia, and daphnia regularly to guarantee optimal condition and colour development. You can provide large individuals with the occasional earthworm, but make sure you do not overfeed them as these Bettas seem particularly prone to obesity.
Sexing the Spotfin Betta
It is relatively straightforward to differentiate the males from female Spotfin Bettas. Males typically grow slightly larger, are more vibrantly coloured and have a broader head shape and more extended fins than that of the females.
Breeding the Spotfin Betta
When you notice a pair that seem interested in each other, you should move them into a separate breeding tank. You should then raise the temperature by a few degrees and decrease the water level by a few inches and perform 10 per cent water changes every couple of days; this will encourage them to spawn.
During spawning, males will wrap themselves around the female several times. As the female lays her eggs, the male will fertilise them. This spawning behaviour can last for around two to five hours.
After the spawning is complete, both the male and the female will collect the eggs from the aquarium floor. The female will then pass the eggs to the male, where he will hold them in his mouth until they are ready to hatch.
The incubation period usually takes between 30 and 35 days, although some people have stated a much shorter incubation time between 12 and 17.
While the male is mouthbrooding, you should not disturb the fish at all. You should leave the female in the tank, and you should not feed the male. Feeding or disturbing the male can cause him to swallow the eggs.
After about two weeks, you can remove the female, and once the fry hatch, the male can also be removed. Typically between 10 and 20 fry will hatch.
The fry will be big enough to accept motile foods such as artemia nauplii and microworm immediately. It would be best if you fed them small amounts of different foods daily as this will help increase the fry's growth rate; however, you should be very careful not to overfeed them as the babies can develop intestinal problems very quickly if overfed.
You should also perform small daily water changes to prevent organic waste accumulating.