In small shallow dish, mix bread crumbs, lemon peel, oregano, salt and pepper. Place egg in another shallow dish; beat with fork. Dip 1 fish fillet into egg; shake off excess. Coat both sides with bread crumb mixture; shake off excess crumbs, and place on cookie sheet. Repeat with remaining fish fillets. Spray tops of breaded fish with cooking spray. Wrap pita breads in foil.