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<p>The freshwater Stinging catfish locally known as Shingi (Heteropneustes fossilis) is exposed to various concentrations of analytical grade FeSO<sub>4</sub>.7H2O. The LC<sub>50</sub> values for Fe<sup>2+</sup> were found to be 109, 68 and 45 mg/l at 24, 48 and 72 hrs, respectively indicating that the toxicity increased with time. Gills appear to be the first target organ for iron toxicity followed by the liver and muscle. Moisture contents in fish tissue increased due to release of thedoi:10.3329/bpj.v18i2.24319 fatcat:pkih5xb2bbbkpbayb73hy4u4p4