Due to rapid industrialization and uncontrolled urbanization around many cities and coastal areas, an alarming level of pollutants has contaminated these aquatic environments. Out of these pollutants, heavy metals are major concern because of their multipurpose usage, toxicity, resistance to degradation and their tendency to bio-accumulate. Metals contamination was choose in the present study since they are the most complex of today’s contamination issues. Our understanding of trace metals science is growing quickly, but important aspect of metal behavior is not yet fully known. The book has integrating geochemistry, biology, ecology and toxicology. It shows identifying opportunities for more effective risk management in the future.