Drain and flake salmon. Set aside. Melt margarine in a medium saucepan over medium heat; Remove from heat and whisk in flour. Cook, stirring constantly, for 2-3 minutes. Whisk in milk and sherry; cook, stirring frequently, for 15 minutes. Stir in flaked salmon and remaining ingredients except fettuccine and parsley; cook 2-3 more minutes, until heated through. Meanwhile, cook pasta according to package directions; drain and place on serving platter. Spoon sauce over pasta and sprinkle with parsley to serve. Makes 4 appetizer servings or 2 main dish servings. Nutrients Per Serving (calculated for main dish serving): Calories: 877 Protein: 48.4 g Carbohydrates: 113 g Fat-Total: 23.1g Cholesterol: 86 mg Sodium: 952 mg Dietary Fiber: 8.48 g