Don't know if the fish and chicken batters are the same, but here are several versions of the fish batter:
2/3 cup club soda 1/3 cup lemon juice 1 egg 1/2 cup Bisquick 1/2 cup self-rising flour
Beat all ingredients together until smooth; let stand 10 minutes. Heat oil to 385 degrees F.
In small bowl put 1/2 cup club soda, in another 1/2 cup self-rising flour. Dip fish first into soda, then into flour. Set fish on cookie sheet till all the fish has been coated; let dry a few minutes.
Dip fish in batter, let excess drip off; and deep fry 3 or 4 minutes per side. Shrimp can be done the same way if peeled and deveined first.
#2 Bisquick Pancake mix Club soda
With wire whisk whip together equal parts Bisquick & boxed pancake mix with club soda till it's the consistency of buttermilk. Moisten fish fillets in water & then coat lightly but evenly in flour. Let dry on waxed paper 5 minutes. Spear pieces one at a time with tip of sharp knife & coat in batter. Deep fry in 385F oil, about 4 minutes each side, till crispy and browned. Do not use tongs or coating will break apart.