While they are now found in Serbia, their distribution is limited compared to their natural range. They are mostly found in the northern parts of the country, specifically along the Danube River and its tributaries.
Here's a breakdown:
* Primary habitat: Danube River and its tributaries in northern Serbia.
* Other areas: They may be found in some smaller rivers and streams within the Danube basin, but their presence is less common.
* Absence: They are not found in the southern parts of Serbia, the mountains, or the Adriatic coast.
It's important to note that their introduction has been controversial, with some arguing that it has negative impacts on the local ecosystem. However, they are now a well-established part of the Serbian wildlife.