Bioaccumulation and carbohydrate levels in Tilapia zilli exposed to sublethal concentrations of lead and copper
Abstract
Tilapia zilli is a commonly cultured fresh water fish and of major economic importance in tropical and subtropical countries throughout the world, particularly in Africa where farms, stocks mixed- sex tilapia in production ponds. Evaluation of bio accumulation of sub lethal concentrations of copper and lead in T zilli for a 12-week exposure period was carried out. The elements were assayed using Shimadzu AA 6200 atomic absorption spectrophotometery and the results were given as μg/g dry wt.The bioaccumulation factors of lead and copper had higher significantly(P<0.05) treated values than there control. Effect of these metals on the quantitative carbohydrate levels in the plasma, muscle and liver were observed.The different concentrations of the various heavy metals significantly(p<0.05) causes corresponding decrease in the fish muscles and liver glycogen levels.
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