In Medium Bowl, Combine The Potato Flakes, Flour, Garlic Powder, Seasoning Salt, Black Pepper, And Cayenne Pepper. Soak Fish Filets In Bowl Of Cold Water. In A Deep Skillet Or Deep Fryer, Melt And Heat The Shortening To 350 Degrees F (175 Degrees C). Dredge Fish Filets In Dry Mixture And Fry In The Hot Oil For 5 Minutes Or Until Fish Flakes Apart Easily. Remove From Oil And Place On Paper Towels To Absorb Excess Oil.