While definitions by the world’s leading experts vary slightly, all agree that sustainable seafood is any fish or shellfish that comes from a healthy stock population—meaning the species is not endangered or overfished—and is harvested with minimal impact to the environment or other aquatic species. Both wild-caught and responsibly farmed fish can be sustainable. For more information on sustainable seafood, and how you can make sure the seafood you eat is sustainable, check out our Sustainable Seafood Guide.