In a large skillet, melt butter. Add the onion, celery and green pepper; saute until tender. Add shrimp; cook and stir until shrimp turn pink. Add the broth, pimientos, Worcestershire sauce, dill, chives, salt and cayenne; heat through. Remove from the heat; stir in bread crumbs., Spoon about 1/2 cup stuffing onto each fillet; roll up. Place seam side down in a greased 9x9-in. baking dish. Drizzle with butter and lemon juice. Sprinkle with seasonings. Bake, uncovered, at 375° for 15-20 minutes or until fish flakes easily with a fork.