3 T. butter
2 T. flour
1/2 t. salt
1 C. milk
2 lbs white fish fillets (ocean perch, flounder, sole etc.)
1/2 lb small cooked shrimp
1/4 C. Parmesan cheese

Make a medium white sauce: melt butter in skillet, add flour and cook untill bubbly, add salt and milk, stirring constantly. Remove from heat. Layor fish in a buttered flat baking dish. Spread shrimp and white sauce over fish. Sprinkle with Parmesan cheese. Bake 350f for 20-25 minutes.