Occurrence of native and non-native crayfish species in Hungary in the last 20 years.

The known distribution of Orconectes limosus spread further to Eastern Hungary in the last five years.

The area occupied by Astacus leptodactylus shifted from the main rivers Danube and Tisza to their tributaries, because of the strong expansion of O. limosus.

Pacifastacus leniusculus threatens the native Astacus astacus population in Western Hungary.