It is a precious freshwater fish that lives in the Danube River basin and its tributaries. Belonging to the Salmonidae family, it is known for its enormous size and unique ecological habits. The body is slender, with a silver gray color and dark markings that help camouflage in rocks and sediments in rivers. The head is large and has sharp teeth, adapted to the predatory habits of fish and other aquatic animals as the main food. It is an important member of the Danube River Basin ecosystem and plays a crucial role in maintaining ecological balance. Currently listed as an endangered species. It is a natural heritage of the Danube River Basin and a focus of attention for fishing enthusiasts and nature conservationists.