In a medium sized bowl, whisk the egg. Set aside.
In another medium sized bowl, mix together the finely chopped pecans, breadcrumbs, lemon zest, garlic powder, salt and pepper. Set aside.
One at a time, take a fillet of fish and dunk it in the egg mixture, making sure it is well coated. I find that using tongs is helpful and keeps your hands cleaner.
Once the fish fillet is covered in egg, transfer it to the pecan and bread crumb mixture. Using a spoon or spatula, make sure to cover the entire fish with the coating. Remove from the bowl and place on a clean plate. Repeat these steps with the remaining fillets of fish.
Once the fish is prepared, cook the fish according to your preferred method (see below).
Serve immediately with your choice of sides and enjoy!