In a medium saucepan, add celery, onions and butter, stirring occasionally. When tender add garlic and mix together. Stir in flour and half and half. Let simmer for 5 minutes.
Stir in fish stock and parsley. Cook for 10 minutes until it thickens. Add shrimp meat and let simmer for 10 minutes or until heated through. Stir occasionally. Add salt, to taste.
When ready, serve with croutons.
Preheat oven to 350 degrees F.
Cut bread with a heart shaped cookie cutter. Place onto a cookie sheet and bake until toasted.