Preheat oven to 170 degrees C. Line a baking tray with foil.
In a small bowl, mix together cream cheese and prawns. Season to taste with basil, salt and pepper.
Make a pocket in each of the fillets, making sure you do not cut through on three sides. Divide the cream cheese mixture into 6 parts, and stuff each fillet. Place on foil lined pan. Squeeze lemon juice over fish.
Bake for 20 minutes, or until fish is thoroughly done.