Preheat oven to 375° F.
Chop macadamia nuts in food processor; mix with panko.
Mix together flour, garlic powder, onion powder, parsley and salt.
In a separate bowl, Mix together beaten eggs and water.
Dip one catfish fillet in the flour mixture, and shake off excess flour; then dip into egg wash mixture, and coat with the macadamia/panko mix. Repeat process for the three remaining fillets.
Oil the bottom of a shallow baking pan, add crusted fillet to the pan and bake for 20 minutes or until golden brown.