The FDA cares very little about most things in practice. So long as they've issued warnings (ass-covering), they'll let mislabelling and false advertising go on

The FDA cares very little about most things in practice. So long as they've issued warnings (ass-covering), they'll let mislabelling and false advertising go on willy nilly. They only get serious if people get sick. Using the wrong fish generally isn't going to make people sick.