Make the Cajun fried seafood platter batter by mixing all of the ingredients together in a small bowl. Set aside.
Make the egg wash by whisking the eggs with the hot sauce and water until lightly beaten.
When the oil is hot, start by submerging the shrimp into the egg wash, then into the batter in batches.
Fry the batches for about 3 to 4 minutes, or until the shrimp are cooked through and the batter is crispy. (NOTE: This batter is really light, and darkens once you take the seafood out and let rest on paper towels. Be careful, or you might overcook the shrimp and catfish. The batter is so light that the oysters will be darker because you can see their natural color through the light batter.)
Next, dip the catfish strips in the egg wash, then the batter. Fry for 3 to 4 minutes per batch, or until cooked through with a crispy coating.
Dip the oysters in egg wash, then batter. Fry in batches for 3 to 4 minutes, then drain on clean paper towels.
Serve with homemade Cajun tartar sauce and hot sauce, and baked or fried French fries, if desired.