Drain and flake salmon (if using canned salmon), reserving liquid. Saute onion, celery, green pepper and garlic in butter until vegetables are translucent. Add potatoes, carrots, chicken broth and seasonings. Cover and simmer for 20 minutes. Add zucchini and cook five minutes longer. Stir in flaked salmon and reserved liquid, evaporated milk and corn. Heat through. Serve with a sprinkling of chopped parsley, if desired. Makes 4-6 servings.