Close your eyes. Think fish. Do you envision half a ton of laminated muscle rocketing through the sea as fast as you drive your automobile? Do you envision a peaceful warrior capable of killing you unintentionally with a whack of its tail? These giant tuna strain the concept of fish.
-- Carl Safina, Song for the Blue Ocean
When most of us think tuna, the image we conjure is more along the lines of a friendly looking tin of Starkist than a voracious top predator. But Atlantic bluefin -- not actually the tuna you'd likely find in a can, but the type that ends up as expensive sushi -- are just that. Because sushimongers' insatiable appetites for bluefin are wiping the fish out of oceans, some scientists hope that aquaculture can relieve the pressure from the wild stocks. Turns out, that's a hard thing to do.
Why? Well, think about it for a second: Would it ever sound like a good idea to farm tigers?