In a large saucepan, cook the diced bacon until just crisp. Remove to paper towels to drain; set aside.
In the bacon drippings left in the pan, saute the celery and onion until just tender. Add the scalloped potatoes with the included seasoning mix, the milk, the water or clam juice, parsley, and pepper. Stir to blend and bring to a boil over medium-high heat. Reduce heat to medium-low, cover, and simmer for 15 minutes.
Stir in the fish chunks and cook, stirring occasionally, for 10 minutes longer, or until fish flakes easily with a fork.
Ladle into bowls and garnish with the bacon.
Calories per serving: 440