But let's not leave tuna out of the picture ... and particularly special because of their small size. The same goes for fish ...

Bluefins attain their enormous size by gorging themselves almost constantly on smaller fish ... and other small organisms and have even been observed eating kelp. The largest tuna ever recorded ...

So, what's the difference? For starters, it's not the same fish. Canned tuna typically comes from albacore. They're small, grow fast, and are abundant for fishing. And they certainly don't weigh ...