1. Mix flour, paprika, and salt together and set aside.
2. In a small bowl, blend the egg and the milk.
3. Heat butter in a large frying pan.
4. Dip perch fillets in egg wash first and then into the flour mixture.
5. Carefully place them into the hot butter in the frying pan and brown on both sides.
6. Remove from the butter and drain on a paper towel to absorb excess butter.
7. Serve immediately.