Betta macrostoma
Regan 1910

Betta macrostoma
Photo by Nonn Panitvong [3]

Keeping Betta macrostoma from an Aquarist View


Betta macrostoma can be housed in pairs, species tanks, and community tanks.  Pairs can be housed in a 20 gallon tank, groups should be housed in a 40 gallon tank or larger.  Pairs should be given cover such as caves and plants.  In a pair or species situation it is possible that fry could be discovered in the tanks.  For best results remove a brooding male.

Water Conditions

Not critical, macrostoma is very tolerant of water chemistry and thrives in almost any type of water as long as it is clean and well filtered.  They should be kept at cool to mid 70s F.


Macrostoma males are more intensely colored then females.  Males in breeding color are brilliant black and orange to red.  Females tend to have two lateral bands while the male does not. Females ovaries might be visible via spotlighting.

Betta macrostoma Male
Photo by Nonn Panitvong [3]

Betta macrostoma female
Photo by Atison Phumchoosri [4]


Macrostoma is a paternal mouthbrooder and the male incubates from 12 to 17 days with 14 days being very consistent.  Incubation time can vary with water temperature.  Females normally initiate spawning.  Soft water with pH below 6 will induce spawning.

Similar Species Similar species would be unimaculata complex members.

Articles on Betta macrstoma

Articles on related species

Betta unimaculata. Philippe Chevoleau.  Communauté Internationale pour les Labyrinthidés [internet]. France; c.9 August 2002.

I’ve Got a New Mouthbrooding Betta – Now What? Michael Hellweg. 2003.

Working with wild Bettas Gerald Griffin.  Flare! 2006

Original Citation Regan, C. T. 1910. [84]
References Baensch, H.A. and R. Riehl, 1985. [24] Robins, C.R., R.M. Bailey, C.E. Bond, J.R. Brooker, E.A. Lachner, R.N. Lea and W.B. Scott, 1991. [88] Kottelat, M., A.J. Whitten, S.N. Kartikasari and S. Wirjoatmodjo, 1993. [58] Baillie, J. and B. Groombridge (eds.), 1996. [28] Hilton-Taylor, C., 2000. [48]
Type Locality Sarawak state, Borneo, East Malaysia
Holotype BMNH 1898.11.2.2
Where Found Countries: Brunei Darsm
Known Occurences: Brunei Darsm: Labi: Wasah Mendaram, Off Labi Road (4 N 114 E )
Brunei Darsm: Nr. Labi, Waterfall Pool In Rain Forest (4 N 114 E)
Brunei Darsm: Sungai Mendaram (TS-84-IV-20 Brunei)]
Miscellaneous Information
Max. Size:
pH range: 6.5 – 7.5
dH range: 10.0
Temperature range: 24 – 26°C
Reproduction: Mouthbrooder
Status: This species is on the IUCN Red List as Vulnerable (D2).

Copyright ©2004-2018 International Betta Congress Inc. All rights reserved.
The IBC & IBC-about-betta-splendens/smp Logo used on these pages are the registered property of the IBC Inc. and can not be used without permission.
For questions in regards to this website, contact the about-betta-splendens/smp Chairperson
Last update:06/11/2018