Contamination of fish and aquatic environment is one of the most important contemporary problems that preoccupied many scientists over recent years. Fish is considered as one of the most foods susceptible to contamination from various sources either from natural environment or during hunting, transferring and handling. Therefore fish play an important role in transport of pollutants whether chemical pollutants such as heavy metals or microbial contaminants such as pathogenic bacteria which could cause serious risk to the health of consumers. This book provides valuable scientific information?s about contamination of fish and aquatic environment with heavy metals and microbiological pollutants. Also, this book provides information?s about sources of heavy metals, uptake, transport and accumulation of heavy metals in fish, toxicity of heavy metals, levels of heavy metals in fish as well as effect of technological methods (blanching, frying, roasting, baking and soaking in different solutions) on the reduction of some heavy metal levels. This book is useful to professionals in environmental pollution field also for workers in the field of food technology especially fish processing.