As one of the few kinds in the ocean, the tuna is a warm-blooded fish. Making it comfortable in both warm tropic and ice-cold water, and also explains why it doesn’t just swim around the equator but also around countries like Iceland. What makes tuna different for most fish is the colour of the fish meat. It’s not white but more pink-ish, and contains loads of omega 3 fatty acids. Great for a healthy heart!