The Battleground: United States
The Fight: The escolar, a member of the mackerel family, has fatty, sweet, firm, white flesh and healthy stocks. U.S. seafood companies started marketing it to restaurants aggressively in recent years, and it popped up on menus under the aliases "white tuna" and "butterfish." But humans cannot digest the wax esters that make escolar so tasty, giving some eaters serious gastrointestinal problems. Food bloggers and journalists in Hawaii -- where most of the fish is caught and sold -- led a campaign to ban it, and lawmakers introduced a bill to do so this year.