Intensive Systems 17 Vegetable-based Feeds 17 Policymakers Role in Global Fishing Sector 18 Fish Prices - A Long-Term Outlook 18 Production - Vertical Expansion 18 Production - Horizontal Expansion 18 Culture-based Fisheries 19 Growing Awareness of Sustainability Needs 19 Long-Term Trends in Aquaculture 19 Science-based Traditional Approach to Aquaculture 20 Issues Affecting Future Trade in Aquaculture and Related Products 20 Externalities 20 Food Security 20 Quality 20 Tariffs 20 The World Aquaculture Society 21 WAS' Mission 21 National Aquaculture Association 21 4.