Did you know that tuna are warm-blooded? Yeah, unlike most fish, tuna can regulate their body temperature. That makes them more like mammals in terms of metabolism. Shellfish, meanwhile, are cold-blooded and basically just filter seawater for a living. So if tuna were shellfish, it would be the one fish that could actually complain about the soup being cold.
Also, some tuna can swim up to 43 miles per hour. The fastest shellfish? A scallop can “swim” by clapping its shell, but it goes about a foot before sinking. Speed comparison: tuna wins by a nautical mile.
