To prepare the orange sauce, whisk together the fresh orange juice, orange zest, green curry paste, lime juice and olive oil. Add the chili pepper flakes and a dash of sea salt. Pour the sauce over the fish and let marinate for 15 – 20 minutes. Heat a well-seasoned grill or grill pan and spray with cooking spray. Grill the fish, basting with the orange sauce, 3 minutes on one side. Turn and grill for about 4 – 5 minutes on the other side, basting with orange sauce.