The King Fish are true members of the tuna family. This King Fish (medium) is renowned for its pale pink flesh and sweet, rich flavor and its lack of too many bones. Whether a Weekend night dinner party, or afternoon barbie – King Fish is the go. Even though it's low in total fat, kingfish is a rich source of healthy omega-3 fatty acids. It's also packed with protein, vitamin B-12 and selenium. But be aware that it has high levels of mercury.