1. Add mackerel to cold water and allow to soak for about 10 hours. Change the water twice.
2. Preheat oven to 375°F before baking.
3. Drain the fish and keep aside.
4. Add paprika and pepper to flour and mix well. Dust mackerel with flour mixture, arrange in a shallow baking dish, greased with butter, top with milk, followed by cream and dot with butter. Bake for 20 minutes.