Overview: The Use of Nondestructive Biomarkers in the Hazard Assessment of Vertebrate Populations (M.C. Fossi, C. Leonzio, and D. Peakall). Enzymatic Biomarkers: Blood Esterases as Indicators of Exposure to Organophosphorus and Carbamate Insecticides (H. Thompson and C. Walker). Clinical Biochemistry (A. Fairbrother). Metabolic Products as Biomarkers: Porphyrins as NondestructiveIndicators of Exposure to Environmental Pollutants (F. De Matteis and C.K. Lim). Genotoxic Responses: Genotoxic Responses in Blood (L.R. Shugart). Genotoxic Responses in Blood Detected by Cytogenetic and Cytometric Assays (J.W. Bickham). Hemoglobin Adducts (L.R. Shugart). Cellular Biomarkers: An Integrated Approach to Cellular Biomarkers in Fish (M. Moore, A. K hler, D.M. Lowe, and M.G. Simpson). Biomarkers in Eggs: Biomarkers in Egg Samples (D. Peakall). Biomarkers in Studies of Endangered Species: Marine Mammals: An Improved Whale Biopsy System Designed for Multidisciplinary Research (R.H. Lambertsen, C.S. Baker, M. Weinrich, and W.S. Modi). Assessment of Organochlorine Pollutants in Cetaceans by Means of Skin and Hypodermic Biopsies (A. Aguilar and A. Borrell). Remarks on Nondestructive Biomarkers: The Rational Basis for the Use of Biomarkers as Ecotoxicological Tools (M. Depledge). Nondestructive Biomarker Strategy: Perspectives and Applications (C. Leonzio and M.C. Fossi). The Future of Nondestructive Biomarkers (J. McCarthy). Index.