“…A review of biological methods applied in the monitoring of rivers in European countries reveals that indices of macroinvertebrate communities are one of the most widely used tools in the biological assessment of rivers. The studies which enable biotic index definition deal mostly with the macrozoobenthic community structure over a long time period to determine the dynamics of physicochemical parameters and their influence on freshwater biota (Fleituch et al, 2002;Fleituch, 2003;Buffagni et al, 2004;Munné & Prat, 2004;Artemiadou & Lazaridou, 2005;Gabriels et al, 2005). In Belgium there is the Belgian Biotic Index (De Pauw & Vanhooren, 1983), in Denmark the Saprobity Index (Pantle & Buck, 1955), in France the Global Biotic Index or IBGN (AFNOR, 1992); in Germany the Saprobity Index (Knöpp, 1954;Pantle & Buck, 1955); in Ireland the Quality Rating System (Flanagan & Toner, 1972); in Italy the Extended Biotic Index (IBE) (Ghetti, 2001); in Luxembourg the Biotic Index (Verneaux & Tuffery, 1968); in the Netherland the Quality Index (K135) (Tolkamp & Gardeniers, 1988); in Spain the modified Biological Monitoring Working Party (B.M.W.P.)…”