A Consideration of Fishless Karsts
The following karst areas have no known troglobitic fishes:
Has 1 aquatic troglobite in 1300 caves (area 43000km2) (Hobbs 2012). Hobbs (2012) reports that this region is arid and this probably explains the very small number of aquatic troglobites and the absence of fishes.
The Dinaric karst, Slovenia and Croatia
The Nullarbor plane, Australia