In a food processor, blend the pecans, garlic powder and lime zest until well ground and blended. Transfer to a plate.
Break the egg into a bowl large enough to roll the fish fillets in. Whisk a bit to break up the yolk and blend the yolks and whites.
Dip the fish fillets in the egg and then into the nut mixture. Coat it well and transfer to an oiled baking dish or a parchment lined cookie sheet.
Bake at 350 F. for 15 minutes or until cooked through.
Allow to cool slightly and serve with a bit of fresh lime juice.
Please note that the nutrition data given here is a ballpark figure. Exact data is not possible.