Zooplanktons and macro invertebrate's samples were collected weekly from three sampling stations at Gbedikere Lake, Bassa, Kogi State, Nigeria from July to September, 2008. Prior to sampling, Temperature of surface water, Secchi disc transparency, pH and dissolved oxygen concentration were evaluated. Zooplanktons were sampled using plankton net while macro vertebrates were sampled using a scoop net and hand picks. The result revealed that zooplankton was made up of Protozoa (43.30%), Rotifera (37.40%), Copepoda (17.0%) and Cladocera (2.30%) while macro invertebrates were presented by ten groups which include Coleoptera (2.44%), Diptera (48.85%), Ephemeroptera (2.59%), Hemiptera (9.59%), Odonata (29.07%), Trichoptera (0.91%), Plecoptera (0.30%), Arachnida (2.13%), Annelida (2.89%) and Nematoda (1.22%). ANOVA revealed significant differences (P<0.05) within stations in all the parameters studied except in zooplankton abundance (P>0.05) while all the parameters showed no significant differences (P>0.05) between stations except in dissolve oxygen concentration and temperature (P<0.05). The status of the lake could said to be eutrophic as indicated by the diversity of zooplankton and macroinvertebrates.
