Channa punctatus, a freshwater fish, was exposed to zinc at three sub-lethal concentrations (10 mg/l, 15 mg/l, and 25 mg/l) over a period of 15 days. At intervals of 8, 10, and 15 days, the effects of this exposure were examined on the bio-accumulation of zinc. In fish from all treated groups, a statistically significant rise in zinc concentration was observed. After switching these fish to regular tap water for an additional two weeks, post-exposure recovery in the fish was seen. Even while the concentration of zinc remained much greater than controls until the end of the experiment, there was a slow removal of zinc. At LC50 for 24, 48, 72, and 96 hours no deaths were noted in the control experiments. When the metals' concentration and duration of exposure rose, the fish mortality went up considerably. Upon exposure of zinc on the fish specimens, the fish displayed behavioral changes during the lethal toxicity trial, including symptoms of fatigue, erratic swimming, jerky movements, restlessness, frequent surfacing, spinning, convulsions, and fin extensions.