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Assessment of composition and diversity of Benthic Micro-invertebrate fauna of Otamiri River, Imo State was conducted between the months of June and August, 2015. Water samples were collected(fortnightly) from four sampling stations established along the river channel for 3 months.Physico-chemical parameters analyses were done using conventional field and standard laboratory techniques. Hydrogen ion concentration mean value of 5.106ppm was obtained. Dissolved Oxygen recorded a mean value of 4.608ppm, Alkalinity recorded a mean value of 103.917ppm, while Carbon (IV) Oxide recorded a mean value of 12.488ppm. Chloride recorded a mean value of 56.292ppm, Hardness recorded a mean value of 81.583ppm, and BOD recorded a mean value of 0. All these parameters differs significantly (p<0.05). Four taxa of benthic microinvertebrate in two phyla: Mollusca and Arthropoda were identified. Gastropod (Melanoidestuberculata) an indicator of organically polluted water had highest percentage abundance of (53.4%) and highest diversity (Shanon-Wiener’s index (H) =2.4%) while Gabiellaafricana had lowest percentage abundance of (6.9%) with diversity (Shanon-Wiener’s index (H) =0.900). Meanwhile, Sybiocladisspp was found to be most evenly distributed with equitability(J=0.979) while Gabiellaafricana constituted the least evenness (J=0.819). Keyword: physico-chemical parameters, Benthic macro-invertebrate and Otamiri river

An Assessment of Benthic Macro-invertebrate Fauna in Middle Course of Otamiri River, Imo State, South-Eastern Nigeria, Nigeria.