Bulgaria
Checklist of Endemic Freshwater Fish Species
This list of freshwater fish species found exclusively in Bulgaria 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
Alburnus mandrensis
(Cypriniformes Leuciscidae) Mandras Bleak
Cottus haemusi
(Perciformes Cottidae) Vit Sculpin