Fishermen in the Great Lakes are concerned that a growing population of cormorants will harm the perch fishery. In this ecology problem, students are asked to evaluate the problem and propose possible actions. The challenge is to determine if the fishermen should be concerned with the presence of the fish-eating birds and back with evidence. A materials list, teacher background information, safety practices, references, assessment, and outcomes are provided. This book selection includes the Table of Contents, Preface, Catalog of Problems, Acknowledgments, About the Authors, References, and Index.