Preface.- Historical findings on presence of pollutans in water bodies in Latin America and their ecotoxicological impact.- Toxicity produced by an industrial effluent from Mexico on the common carp (Cyprinus carpio).- Pesticide contamination in Southern Brazil.- Embryotoxicity and teratogenicity induced by naproxen in Xenopus laevis, species of ecological interest in Mexico.- Differential responses of biochemical and behavioral parameters in the native gastropod Chilina gibbosa exposed subchronically to environmental concentrations of two insecticides used in argentina.- Oxidative stress induced by water from a hospital effluent of the city of Toluca, Mexico on Hyalella azteca.- Evaluation of the toxicity of municipal effluents from a locality in the State of Mexico using Hyalella azteca as a bioindicator.- Analysis of heavy metals present on air through the toxicity analysis in water by the gas washer method, using the organism Daphnia magna.- Ecotoxicological Studies of Metal Pollution in Sea Turtles of Latin America.- Evaluation of the toxicity of an industrial effluent before and after a treatment with Sn-modified TiO2 under UV irradiation through oxidative stress biomarkers.- Effects of river pollution on its biota: results from twenty years studies in the Suquía River Basin (Córdoba, Argentina).- Effects found and induced by the presence of metals in species of the economic and ecological importance of Mexican aquatic environments.- Environmental Pollution by Hydrocarbons in Colombia and its Impact on the Health of Aquatic Ecosystems.- Biomonitoring of diffuse contamination in the Subtropical Region of Brazil: Multibiomarker Assessment in neotropical freshwater fishes.- Genotoxicity biomarkers in fish erythrocytes and water quality parameters.- Health diagnosis of the fish Scomberomorus cavalla from Tecolutla, Ver. México.- Histopathological assessment of organisms in ecotoxicological studies from Mexico.- Histopathological analysis of the intestine from Mugil cephalus on environment reference sites.- Impacts caused by manganese in the aquatic environments of Brazil.- Genotoxic effect of amoxicillin on peripheral blood of common carp (Cyprinus carpio).- Final conclusions.- Index.