how do i cook this fish recipe?!
It depends how big is the sea bass, in my own experience I cook it half an hour for each pound when it is tin foiled at 200c. But then again it depends also in your oven, if it is fan assisted you will have to lower 20c so it would be 180c. I wouldn't recommend to put the lettuce with the sea bass, lettuce in great proportion is water and it will dilute in the steam the fish will generate.
A good rule of thumb is ten minutes per inch. It works well with meat and fish. Your temperature has to be at least 350 for the rule to work.
If you put it in foil in a hot oven I would expect you to cook it for ten minutes per inch of thickness at the thickest point, plus a couple of minutes because the foil insulates the fish at first.
And you will want to let it rest for a couple of minutes before serving it.