DO-AHEAD TIP: Marinate fish for 30 minutes (see recipe).
Prepare marinade: In a small bowl, place all ingredients except fish; blend well.
Place fish in a large zipper-topped plastic bag and pour marinade over the top. Seal bag and refrigerate for 30 minutes.
At time of cooking, preheat grill to MEDIUM-HIGH; remove fillets from bag (discarding marinade and bag); grill for 5 minutes per side or until fish flakes easily when tested with a fork.