PLACE barbecue sauce, orange sections and jalapeño in blender container; cover. Blend on high speed 2 minutes or until smooth. Reserve 1/4 cup of the mixture. Pour remaining marinade over fish in resealable plastic bag. Refrigerate 20 minutes to marinate.
REMOVE fish; discard marinade. Grill over medium-high heat 4 minutes. Turn over; grill an additional 2 minutes or until fish flakes easily with fork. Remove from grill. Let stand 5 minutes.
COMBINE reserved marinade, green onions, orange juice and cilantro. Spoon onto middle of tortillas. Divide fish among tortillas, fold in half and serve.