Abstract
Some physico- chemical parameters were investigated alongside with the zooplankton of Adofi River between June and November 2009. The nutrient levels detected were significantly very high. Two taxonomic groups were identified; the rotifera and the Cladocera. The rotifers were the most occurring species (15) constituting about 98.7% of the total zooplankton species while the Cladocera recorded only two species with 1.3%. Of the phylum rotifera, the family Brachionidae recorded six species constituting 40% of the total number of species while the other three families Lecanidae, Proalidae and Trichocercidae had three species(20 %) each. Despite the equal species composition of the three families, the family Proalidae(39%) was almost of equal abundant composition with the family Brachionidae(39.4%} while the families Lecanidae and Trichocercidae contributed 12.9%, and 7.1% respectively. The two species of Cladocera recorded were Ceriodaphnia audragula contributing 1% abundance and Diaphanosoma leuchen having 0.5% abundance. No significant difference was found between the physico – chemical parameters. However, significant difference was found between the physico- chemical parameters and the zooplankton abundance (P<0.01).
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