What I do is go to the fish counter with the idea of buying some white fish. Then I'll choose the best fish out of hamour, sherri, and parrot fish. Essentially, all of these taste the same.

Often, if you go to the counter with the idea of getting hamour, you'll end up buying a fish that's not too great, but if you've got three options you're more likely to get a better fish.

Hope this helps.