Prepare cedar planks or wraps according to package directions.
Drizzle oil over both sides of fish
In a small bowl, combine ground pepper, dill, garlic powder, paprika, kosher salt and Cajun seasoning.
Sprinkle seasoning on both sides of fish. Place fish skin-side down on the plank(s). Zest 1 lemon across the tops of fish and squeeze half the lemon over all of the fish. Use the other half for garnish, if desired.
Place planks or wraps on grill and cook for 12-15 minutes or until the fish is cooked through and flakes easily with a fork. Remove from grill and transfer fish to a serving plate removing skins before serving.
Garnish with additional lemon juice, fresh parsley.