Smoked Whiting and Scallop Chowder

Name: Smoked Whiting and Scallop Chowder
Ingredients: 1 1⁄2 lb. smoked whiting, haddock, or whitefish fillets; 6 1⁄2 cups milk; 8 tbsp. unsalted butter; 2 medium carrots, chopped; 2 stalks celery, finely chopped; 1 medium yellow onion, finely chopped; 3⁄4 cup flour; 1 cup chicken stock; 1 medium russet potato, peeled and finely chopped; 6 oz. scallops, finely chopped; Kosher salt and freshly ground black pepper, to taste; 1⁄4 cup finely chopped parsley; Country bread, for serving (optional)