This book focuses on the challenges people face in managing agricultural crops, aquaculture, fisheries and related ecosystems in areas of coastal zones in the tropics of Asia, Africa, Australia and South America. Challenges arise from conflicts in the use of natural resources among different stakeholders. Through many case studies, the book discusses the nature of these conflicts and identifies what is known and not known about how to manage them. Case studies include: * trade-offs between enhancing agricultural production and maintenance of rural livelihoods and aquatic biodiversity.* lessons learnt from the conversion of mangrove forests to shrimp farms.