2Place shrimp and fish in shallow glass or plastic dish or heavy-duty resealable plastic food-storage bag. Add 1/4 cup of the vinaigrette; turn shrimp and fish to coat. Cover dish or seal bag; refrigerate 30 minutes. Reserve remaining vinaigrette.
3Heat gas or charcoal grill. Remove shrimp and fish from marinade; reserve marinade and set shrimp aside. Place fish and fennel on grill over medium heat. Cover grill; cook 5 minutes. Brush fish and fennel with marinade; add shrimp. Cover grill; cook 5 minutes, turning and brushing fish, fennel and shrimp with marinade 2 or 3 times, until shrimp are pink, fish flakes easily with fork and fennel is tender. Discard any remaining marinade.
4Arrange salad greens on serving platter. Cut fish into bite-size pieces. Arrange fish, fennel, shrimp and remaining salad ingredients on greens. Serve with reserved vinaigrette.