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The elemental lead (Pb) occurs naturally in the environment as well as being produced by mining and manufacturing activities [1]. Lead and its compounds are serious pollutants of the aquatic environment. Moreover, several authors also agree that toxic and non-biode‐ gradable metals such as lead accumulate in many fish species, causing various diseases such as renal [2, 3], hepatic lesions [4], endocrine impairment [5] and effect of cell membrane lip‐ ids in cells of the central nervous system.

The Effect of Lead and Zeolite on Hematological and Some Biochemical Parameters in Nile Fish (Oreochromis niloticus)