You remove the skin before cooking
The skin will be easier to remove if you cook the fish skin-side down first. Cooking loosens the binding layer of fat between the meat and the skin, making it easy to peel off. The tough proteins in the fish skin also make it easier to flip and move around the pan. “Salmon must have the skin left on during cooking to crisp up nicely,” says Tentori. (However, other types of fish that are often thick cuts, like snapper, may take too long to cook if the skin is left on. Ask your fish monger for advice about whether to leave skin on or off if you’re unsure).