Add the 4 cups peanut oil to a large wok or heavy skillet and heat over high heat until it reaches 375°F.
While the oil is heating, whisk the 2 large egg yolks and 1½ cups seltzer water in a medium bowl.
In another bowl, sift together the 1 cup all-purpose flour, ½ cup cornstarch, ¼ cup rice flour, and 1 tsp of kosher salt. Add the flour mixture to the egg mixture and stir quickly to combine, taking care not to overwork the batter (lumps are okay).
Pat the 1½ lb white fish fillets chucks dry with paper towels and season on both sides with the ½ tsp black pepper and remaining 1 tsp salt.
Working in batches, dip the fish in the batter and add it to the hot oil. Cook, taking care not to overcrowd the pan, until the fish flakes easily and the batter is crisp and golden brown, turning as necessary, 5 to 6 minutes.
Remove from the oil and transfer to a paper towel–lined tray to drain briefly before serving. Serve with your favorite fries.