PREHEAT oven to 350°F. Prepare stuffing mix with the water and 3 Tbsp. of the margarine as directed on package.
SPRINKLE fish evenly with 1 Tbsp. of the lemon juice. Spoon 1/3 cup of the prepared stuffing onto each fillet; roll up loosely to enclose stuffing, starting at one of the short ends. Place, seam-sides down, in greased baking dish; spoon remaining stuffing around roll-ups. Sprinkle evenly with remaining 1 Tbsp. lemon juice and the paprika; dot with remaining 1 Tbsp. margarine.
BAKE 20 min. or until fish flakes easily with fork.