Place 1 fish fillet along one short side of phyllo stack; top with 1/4 of the spinach mixture. Fold over long sides of phyllo, then roll up, starting at fish-topped side. Repeat with remaining phyllo sheets, fish and spinach mixture. Place, seam sides down, on parchment-covered Baking Sheet
; spray with cooking spray. Cut 3 diagonal slits in top of each wrap.