Smoked Trout Chowder

Name: Smoked-Trout Chowder
Ingredients: 1 tablespoon butter; 2 ribs celery, chopped; 6 scallions, white bulbs and green tops chopped and reserved separately; 2 cloves garlic, minced; 1 pound baking potatoes (about 2), peeled and cut into 1/2-inch cubes; 1/4 cup dry white wine; 2 cups water; 1 quart canned low-sodium chicken broth or homemade stock; 1 teaspoon dried thyme; 1 bay leaf; 1 1/4 teaspoons salt; 1 cup half-and-half; 2 fillets peppered smoked trout, skin removed, fish flaked