Cut muskrat into quarters and soak in salt water for at least 1 hour; rinse and pat dry with a clean cloth. Dip the pieces in prepared egg batter and dust with seasoned flour mixture. Place coated pieces in skillet with hot oil and brown quickly. After pieces are browned, reduce heat and fry slowly for 1 hour. Make a milk gravy in the pan after the fried muskrat is removed and pour it over the meat when served.Milk gravy: Stir in flour until dissolved. Gradually stir in milk. Cook until thick and bubbly. Season with salt and pepper.