If fish steaks are large, cut into 6 serving pieces. In shallow glass or plastic dish or resealable food-storage plastic bag, mix remaining ingredients except lime wedges. Add fish; turn to coat. Cover dish or seal bag and refrigerate, turning fish once, at least 1 hour but no longer than 24 hours.
Heat coals or gas grill for direct heat. Remove fish from marinade; reserve marinade. Cover and grill fish about 4 inches from medium heat 11 to 15 minutes, brushing 2 or 3 times with marinade and turning once, until fish flakes easily with fork. Discard any remaining marinade. Serve fish with lime wedges.