Preheat A Grill For High Heat. Squeeze The Juice From The Lime Wedges Over Fish Fillets, Then Season Them With Salt And Pepper. Grill Fish Fillets For About 5 Minutes On Each Side, Until Browned And Fish Can Be Flaked With A Fork. Remove To A Warm Serving Plate. Heat The Oil In A Skillet Over Medium Heat. Add The Garlic; Cook And Stir Just Until Fragrant, About 2 Minutes. Stir In The Butter, Remaining Lime Juice And Cilantro. Serve Fish With The Cilantro Butter Sauce.