While toxicity testing procedures and hazard assessment approaches have been published in past decades, many are wanting in detail for users to fully understand or reproduce successfully. Small-scale freshwater toxicity investigations (Volumes 1 and 2) responds to this need by providing comprehensive information on biological testing which is normally scattered and difficult to find. In Volume 2, 11 chapters on hazard assessment schemes are described in great detail by way of a homogeneous structure that all contributors had to follow. These comprehensive texts allow readers to know the different approaches/strategies, based on applying batteries of bioassays, that are being used internationally to assess the toxic potential of complex environmental media (e.g., effluents, sediments) impacted by chemical contamination stemming from human activities. Academia (students, professors), government (environmental managers, scientists, regulators) and consulting professionals (biologists, chemists, engineers) should find this volume of interest. For example, Volume 2 contents offer relevant knowledge on how to deal with (non)point source pollution issues exemplified by case studies taken from 'real world situations', thereby enabling the right decisions to be taken to ensure protection of aquatic environments. Both Volumes 1 and 2 of the book also feature a broad review on toxicity testing applications, as well as a complete glossary of scientific/technical terms employed by editors/contributors in their respective chapters. In short, all groups directly or indirectly involved with the protection and conservation of freshwater environments will find Volume 2 appealing, as will those who simply wish to become familiar with the field of aquatic hazard assessment based on the use of bioassays. 'Botheditors and contributors of these books have demonstrated outstanding talent in presenting a thorough review of toxicity testing applications and in detailing the theoretical and practical aspects of several small-scale procedures and hazard assessment schemes. These two companion volumes are an important contribution to the field of freshwater ecotoxicology. They will prove immensely useful for all professional scientists and students alike desirous of knowing and applying reliable tools and approaches to appraise the numerous adverse effects that anthropogenic sources of toxic pollutants can have on aquatic environments.' François Ramade, Emeritus Professor of Ecology, University of Paris-Sud, France. 'Blaise and Ferard have provided a comprehensive account of biotests for environmental toxicity and their use in hazard assessment of contamination which will be of great value to those concerned with the worldwide problem of environmental degradation. These two volumes will be of great value to assessment of the worldwide problem of environmental contamination.' Ian Falconer, Editor Environmental Toxicology, University of Adelaide, Australia.