“…The inadequacies of physicochemical monitoring alone have necessitated the complementary use of biological monitoring (i.e., biomonitoring) tools and approaches (Arimoro, Ikomi, Nwadukwe, Eruotor, & Edegbene, ; Bonada et al, ; Serra, Graca, Doledec, & Feio, ). Biomonitoring tools/approaches widely used include single biotic indices (e.g., South African Scoring System version 5, Dickens & Graham, ) functional feeding group (FFG; e.g., Akamagwuna, Mensah, Nnadozie, & Oghenekaro, ; Baptista et al, ; Lakew & Moog, ; Ntislidou, Lazaridou, Tsiaoussi, & Bobori, ), multivariate approaches (e.g., Chowdhury, Gallardo, & Aldridge, ; Gieswein et al, ; Oliveira, Mugnai, Pereira, Souza, & Baptista, ), and multimetric indices (e.g., Bonada et al, ; Edegbene et al, ; Mereta et al, ; Monaghan & Soares, ). Of these approaches, the multimetric indices have been shown to perform extremely well particularly because they integrate information and data from multiple dimension of aquatic biota and the ecosystem as a whole (Bonada et al, ).…”