Yellowtail is often mistaken for a type of tuna. This delicate fish is a member of the jack family, which includes the pompano and amberjack fish. Yellowtail fish has a mild, sweet flavor with a firm texture. The majority of yellowtail fish are raised on fish farms in Japan and imported as frozen fillets. The Japanese call this fish hamachi and use it regularly in sushi. Its delicate flavor and firm texture make yellowtail perfect for grilling.