Cobia is a large saltwater fish valued in cooking for its firm, white flesh and mild, faintly sweet flavor; it's also sold as black kingfish or lemonfish. Found in warm coastal waters worldwide, it's especially associated with the Gulf of Mexico and the U.S. Atlantic and Gulf coasts, where it's grilled, baked, seared, or served raw as sashimi. Its moderate fat content gives it a richer, more buttery texture than most white fish. Cobia is increasingly farmed, which has made a once-rare catch more widely available to home cooks and restaurants.