| Summary: | The confirmed fishes of Nizhnevartovsk district waters (Russia, Western Siberia, Khanty–Mansi autonomous okrug (district)) comprise 24 species in 19 genera, 10families, 6 orders and 2classes found in Middle Ob River basin. There are also 5 species whose presence inNizhnevartovsk district waters needs confirmation by the described specimens. The most diverse order is theCypriniformes with 11 confirmed species (45.9%) followed by Salmoniformes with5species (20.8%), Perciformes (3 species, 12.5%), Petromyzoniformes (2 species, 8.3%), Acipenseriformes (2species, 8.3%) and Gadiiformes with 1species (4.2%). Of the 5 introduced species (including three require confirmation), the freshwater bream Abramis brama (Linnaeus, 1758) and the pike–perch Sander lucioperca (Linnaeus, 1758) naturalized and are constantly found.
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