POUR 1/2 cup of the dressing over fish in shallow dish; cover. Refrigerate 30 min. to 1 hour to marinate. Drain fish; discard marinade.
PREHEAT greased grill to medium heat. Grill fish 5 to 6 min. on each side or until fish flakes easily with fork.
TOSS greens with remaining dressing; divide evenly among 4 serving plates. Top with fish.