IF I am correct, they have 2 fillets, but are usually butchered into 4. I believe they do this for size as well as the odd shape of the fillets. They kind of look like comment bubbles. Often times, people will sell "john dory" but will sub it for porgy or some other fish. But the only thing I KNOW for a fact, is that it's some good chit!!!! The 3rd best flavor fish I've ever had!!!
the fish fillets naturally seperate into 3 each side and then you cut them apart along these seams, generally the top 2 are only served, subject to where you work of course. Obviuosly we are talikng about the larger fish here otherwise carry on as normal