1. Mix 3 tablespoons of coconut milk and 3 tablespoons of lime juice in a shallow dish. Add fish. Cover and marinate at room temperature for 15 minutes.
2. Mix remaining 1 tablespoon coconut milk, remaining 3 tablespoons juice, mango, and next 5 ingredients (through chile) in a bowl. Add 1/4 teaspoon salt. Mix well.
3. Remove fish from the marinade, and discard the marinade. Sprinkle fish with remaining 1/4 teaspoon salt and pepper. Heat a grill pan over medium-high heat. Spray the pan with the non-sticking cooking spray. Cook the fish 4 minutes on each side (should become flaky). Serve with mango salsa.
Avocado slices are a great addition to this delicious meal.