The spotfin betta or Brunei beauty (''Betta macrostoma'') is a species of

labyrinth fish The Anabantoidei are a suborder of anabantiform ray-finned freshwater fish distinguished by their possession of a lung-like labyrinth organ, which enables them to breathe air. The fish in the Anabantoidei suborder are known as anabantoids or ...

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

to the island of

Borneo Borneo (; id, Kalimantan) is the third-largest island in the world and the largest in Asia. At the geographic centre of Maritime Southeast Asia, in relation to major Indonesian islands, it is located north of Java, west of Sulawesi, and eas ...

. It generally inhabits pools of very slow-moving water along rivers and streams in very shallow waters of or less. This species grows to a length of in the wild, and is occasionally found in the

aquarium An aquarium (plural: ''aquariums'' or ''aquaria'') is a vivarium of any size having at least one transparent side in which aquatic plants or animals are kept and displayed. Fishkeepers use aquaria to keep fish, invertebrates, amphibians, aq ...

trade; in captivity this species regularly reaches 4 inches in length.

References

Fauna of Brunei Betta Taxa named by Charles Tate Regan Fish described in 1910 Taxonomy articles created by Polbot Freshwater fish of Borneo {{Anabantiformes-stub