Abstract
Acute toxicity of lead and zinc salts (Pb(NO3)2 and ZnCl2) and their bioaccumulation patterns in juveniles of Clarias gariepinus was investigated. ZnCl2 with a 96hr LC50 value of 15.301mg/l was found to be more toxic than Pb(NO3)2 with a 96hr LC50 value of 51.516mg/l. ZnCl2 was bio-accumulated at a faster rate in the gills and flesh of the fish than Pb(NO3)2 . The amount of ZnCl2 and Pb(NO3)2 bio-accumulated reduced as the experiment proceeded. Higher levels of ZnCl2 were recorded in the gills than in the flesh of the juvenile fishes. Essential heavy metals can be more toxic to aquatic organisms than non essential heavy metals when the former is present in high enough concentrations. Water chemistry, speciation and bio-availability of heavy metals in surrounding media are major factors that determine rate of accumulation in aquatic organisms.
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