This book is designed to fill the need for a single, comprehensive source of information concerning aquatic toxicology. It presents a definitive description of basic concepts and test methods employed in aquatic toxicology studies as well as examples of typical data and their interpretation. The 23 chapters are divided into five parts. The first part - Toxicity Testing - describes the basic concepts and methodologies used in aquatic toxicity testing. Sublethal Effects, the second part, presents information on sublethal effects testing and its utility in evaluating the less obvious effects of chemical exposure on aquatic organisms. The third part - Specific Chemical Effects - summarizes the available literature on the toxicity of generic types of chemicals (such as pesticides and metals) to aquatic organisms. Chemical Distribution/Fate, the fourth part, discusses the various factors that affect the distribution and fate of chemicals in the aquatic environment and thus influence the chemical concentrations to which aquatic organisms may be exposed. The concluding fifth part - Hazard Evaluation - discusses the manner in which environmental fate and biological effects data are integrated to provide an assessment of potential hazard posed by the use of discharge of chemicals in the aquatic environment.