The Banska River is inhabited by a large number of fish species, including the Mullet, Danube Bleak, the Carassius and the Common Nase.
The fish is endangered, because various competitors were introduced into the lake during the Soviet period, including common whitefish (Coregonus lavaretus) from Lake Ladoga, goldfish (Carassius auratus) and narrow-clawed crayfish (Astacus leptodactylus); and because of lake level change.