Chondrostoma Knerii
Chondrostoma knerii, often known as the Kner's bitterling, is a freshwater fish species native to numerous Balkan river systems, including the Drava, Sava, and Danube rivers in Croatia.
Chondrostoma knerii is threatened in Croatia by habitat loss and fragmentation, pollution, and overfishing.
The IUCN Red List classifies the species as fragile, and conservation efforts are underway to safeguard and restore its numbers.