Sushi salvation: Startup sees future of fish farms in giant Kevlar spheres

That luscious ahi tuna roll you chowed down on at your local sushi joint? It's the same as eating an endangered Siberian tiger. Well, not quite. But scientists are increasingly worried that ahi, the blood-red belle of the raw-fish ball, is being quickly fished to extinction courtesy of the never-ending quest for superior sushi.

But now, a small startup in Hawaii has an ambitious goal to save the ahi. Its secret weapon? A giant, self-powered, Kevlar-coated ball that could prove a perfect way to raise tuna in captivity and supply discerning fish fiends with their piscine fix without further depleting wild stocks.