Distribution of non-indigenous fish species, Prussian carp Carassius gibelio (Bloch, 1782) in the Turkish freshwater systems.

The non-indigenous fish species, Prussian carp Carassius gibelio (Bloch, 1782), was first reported in the Thrace region of Turkey. The species is now established in at least 46 freshwater systems (lake, river, reservoir, lagoon and pond) of Turkey and the species' spread has been especially rapid between 1998 and 2006. Especially, this species show the rapid invasion of Carassius gibelio in Turkish freshwater systems from Thrace to Anatolia.