free from any of the overtones that often constrain professional fisheries meetings. The present volume is the result. This volume aims to be useful as an appraisal of the state of the art by a mixed collection of insiders and outsiders. Most interestingly, I think, it aims (especially in the four group reports) to identify some of the major areas of unresolved controversy and some of the major questions yet unanswered. I see the book as essentially a tentative statement - often by several dissonant voices - about directions in which we may be heading; the book is emphatically not a canonical utterance on how to do things. It is intended to stimulate, not to codify. Following the usual Dahlem Workshop format, the discussions were organized under four themes. Although crisp demarcation is not possible, the first two themes broadly deal with biological aspects of the dynamics of single populations and the dynamics of systems with many species. The later two themes take up questions of management under uncertainty and multispecies management. In all this, the word "fish" is interpreted broadly to include such taxonomically varied beasts as whales, shrimp, crabs, shellfish, and squid, along with fish in a strictly zoological sense.

Dynamics of Single Species Group Report.- Why Do Fish Populations Vary?.- The Availability and Information Content of Fisheries Data.- Dynamics and Evolution of Marine Populations with Pelagic Larval Dispersal.- Ecosystems Dynamics Group Report.- Observed Patterns in Multispecies Fisheries.- Some Approaches to Modeling Multispecies Systems.- The Response of Multispecies Systems to Perturbations.- Management under Uncertainty Group Report.- Kinds of Variability and Uncertainty Affecting Fisheries.- Managing Fisheries under Biological Uncertainty.- The Wider Dimensions of Management Uncertainty in World Fisheries.- Strategies for Multispecies Management Group Report.- Strategies for Multispecies Management: Objectives and Constraints.- Management Techniques for Multispecies Fisheries.- Epilogue.- Geographical Glossary.- Glossary of Technical Terms.- List of Participants with Fields of Research.- Author Index.