Determination of the Lethal Concentration 50% (LC<sub>50</sub>) of Hexavalent Chromium in Nile Tilapia (Oreochromis niloticus)

The contamination of heavy metals in water is a worldwide issue which increasing day by due to the different types anthropogenic activities. These pose serious health risk on aquatic organisms. One such metal chromium. present study about determine 24h, 48h, 72h and 96 hours LC50 value hexavalent chromium for Nile Tilapia, Oreochromis niloticus. In study, 96h exposure Tilapia (Oreochromis niloticus) potassium dichromate (K2Cr2O7) was able measure lethal concentration 50 (LC50) niloticus). A kind computational graphical technique can be applied obtain an (median concentration) from response concentration-mortality data produced acute mortality experiment. No process should that does not evaluate both its 95% confidence limits. were statistically analyzed application SPSS software based Finney's Probit Analysis Method 72h, h values niloticus found 121.06mg/l, 108.30mg/l, 99.31mg/l, 93.49mg/l respectively. With increase metal, fish increased gradually. directly proportional exposed metals. results indicate revealed toxicity when this could release fact may outcome deleterious toxic effects influences environment.