Heat 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.