Pour oil into deep fryer or large heavy skillet, filling no more than 1/3 full. Heat to 375°F on medium heat.
Sprinkle fish lightly with OLD BAY. Mix flour and 4 teaspoons OLD BAY in medium bowl. Stir in egg. Gradually add beer, stirring with wire whisk until smooth. (Sip the remainder of the beer. Do not waste good beer.)
Dip fish into batter. Shake off excess.
Fry fish, a few pieces at a time, 3 to 5 minutes or until golden brown, turning once to brown evenly. Drain on paper towels.