Assessment of Heavy Metal Levels in False Upside-down Catfish (synodondis Nigrita) and Shadfly (mayfly Nymph) From Kiri Reservoir, Adamawa State

Assessment of Heavy metal levels in false upside-down Catfish (Synodondis nigrita) and Shadfly (Mayfly nymph) was conducted in Kiri Reservoir, Adamawa state, Nigeria. False upside-down Catfish (S. nigrita) and Shadfly (Mayfly nymph) was sampled bi-weekly in triplicate for six (6) months. Cu, Cd, Pb, Fe, and Zn was determined using Atomic Absorption Spectrophotometer (AAS) and the values obtained were expressed in milligram per kilogram. Data obtained were subjected to descriptive analysis to establish means, standard errors and one way analysis of variance (ANOVA) was used to determine the mean significant at 0.05 of heavy metals in false upside-down Catfish (S. nigrita) and Shadfly (Mayfly nymph). All the heavy metals investigated were detected in false upside-down Catfish (S. nigrita) and Shadfly (Mayfly nymph). The sampling sites from the reservoir with the highest concentration of heavy metals are as presented below: In false upside-down Catfish (Synodondis nigrita) Pb (0.0032±0.27amg/kg), Cr (0.0045±1.00amg/kg), Cd (0.0036±1.00amg/kg), Zn (12.84±1.00amg/kg), and Cu (2.73±0.83amg/kg) while in Shadfly (Mayfly nymph) Pb (0.0023±0.07amg/kg) Cr (0.0025±0.22amg/kg), Cd (0.0026±0.06amg/kg), Zn (3.33±1.00a mg/kg) and Cu (0.30±1.00amg/kg). Pb, Cr, Cd, Zn and Cu investigated were not above the recommended permissible limits by NIS (2007) in false upside-down Catfish (S. nigrita) and Shadfly (Mayfly nymph. From the findings therefore, Kiri reservoir fish and mayfly investigated are not polluted with these heavy metals mentioned.