This textbook consists of eleven chapters covering different topics of fishery. The interpretation of subject matter in each chapter of this book has been made carefully and systematically by the author giving much emphasis on the requirement at the tertiary level fishery in the Tropics. The language of the textbook is simple and clear; making it possible for self-study with minimal assistance. The book is a comprehensive one and will meet the growing needs of fishery students and teachers in the Tropics.