This document summarizes the International Seafood Sustainability Foundation (ISSF) and issues related to illegal, unreported, and unregulated (IUU) fishing. It discusses how ISSF works to address sustainability challenges in tuna fisheries through science, advocacy, and industry commitments. It also outlines the negative impacts of IUU fishing and describes two bills - the International Fisheries Stewardship and Enforcement Act and the Pirate Fishing Elimination Act - that aim to strengthen enforcement against foreign IUU fishing activities. The U.S. seafood industry supports both of these bills with minor modifications.