Illegal, unreported and unregulated (IUU) fishing is a major threat to fisheries’ sustainability. It occurs in all types of fishing. It impacts fish stocks, vulnerable marine ecosystems, and the livelihoods of millions of people who depend on fishing for food and income. The damage caused by IUU fishing is serious, but we have the means to stop it. The FAO Agreement on Port State Measures (PSMA) is the world’s first-ever binding international instrument that targets IUU fishing.