Preheat the oven to 400 degrees F (200 degrees C). Lightly grease an 8x8 baking dish.

Combine bread cubes, mayonnaise, parsley, butter, lemon juice, seafood seasoning, mustard, black pepper, and hot pepper sauce together in a mixing bowl. Gently stir in crabmeat until combined, being careful not to break crab chunks.

Place fish fillets on a clean surface; spoon 1/4 crab mixture onto one side of each fillet. Starting on the side with the crab mixture, roll up each fillet around crab filling. Place rolled fillets into the prepared dish, open sides down.

Bake in the preheated oven until light brown and bubbly, and fish flakes with a fork, about 15 minutes.