The reason why you should grill fish in foil is to keep the fish moist as well as prevent the fish from sticking to the grill and also ensure even cooking of the grilled fish.
Wrapping the fish in foil when grilling makes for a sealed environment which traps steam and heat in the fish and prevents the fish from drying out when grilled.
Using foil on your grilled fish also helps to distribute heat more evenly and ensures that the fish cooks through without it burning on the outside.
Grilling your fish in foil also allows you to add some herbs and aromatics which can help to perfectly season the grilled fish.
Grilling the fish in foil also makes for easier cleanup as well and prevents overcooking and burning of the fish.
Baking fish in foil also helps make for a tender and tasty fish every time.
I like to bake trout fish and Jalapenos together in foil and it allows the flavor and juices to stay in.
When grilling fish in foil, wrap the foil securely around the fish, but leave space for the fish to expand as it cooks.
Then grill the fish 5 minutes to 7 minutes on each side or until the fish flakes with a fork.