re-heat the oven to 350°F. Meanwhile, in a saucepan, combine all of the sauce ingredients together and cook over a medium heat for 5 minutes.Turn the heat down low to keep warm.
Add the butter to a small bowl and heat in the microwave just until melted. Add the lime juice and mix together. Place the muskie fillets in baking dish and brush on the lime and butter mixture.
Bake the fish for 10 minutes, turn the fish over, then bake for an additional 10 minutes or until it easily flakes with a fork. Baste the fish every 3-5 minutes during cooking. When done, transfer the fish to serving plates and top with the tropical sauce.