Knipowitschia radovici, the Norin goby, is a species of goby endemic to Croatia where it only occurs in the drainage basin of the Neretva River where adults inhabit the deepest parts of the rivers (down to 5.5 metres (18 ft)) in the strongest current (juveniles are found in shallower waters). This species can reach a length of 2.8 centimetres (1.1 in) SL.