For identification of fish species the following literature was used:
Schmidt-Ries, H, 1943 Die Fische Griechenlands. Z. Fischereiwrss., 41:95–141
Ondrias, J.C., 1971 A list of fresh and sea water fishes of Greece. Hellen.Oceanol.Limnol., 10 23–96
Blanc, M. et al., 1971 European inland water fish. London, Fishing News (Books) Ltd., pag.var.
Fig. 1 DRAINAGE SYSTEM OF LAKE IOANNINA
