Brunei
Checklist of Endemic Freshwater Fish Species
This list of freshwater fish species found exclusively in Brunei is based on the taxonomy used in Eschmeyer's Catalog of Fishes (2023). For further details on possible inaccuracies in the list see Sources & Caveats.
Fricke, R., Eschmeyer, W. N. & Van der Laan, R. (eds) 2023 Catalog of Fishes: Genera, Species, References. Version downloaded 9 February 2023 https://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatmain.asp
The current version can be accessed here
See also the 2018 article "Annotated checklist of freshwater fishes from Brunei Darussalam, Borneo" at (ResearchGate)
Gastromyzon cranbrooki (Balitoridae)
Gastromyzon venustus (Balitoridae)
Neogastromyzon brunei (Balitoridae)
Barbodes xouthos (Cyprinidae)
Neostethus geminus (Phallostethidae)
Ompok platyrhynchus (Siluridae)
Dermogenys bruneiensis (Zenarchopteridae)