Halibut Vegetable Chowder

• 1 1/2 pounds Alaskan halibut • 2 carrots, coarsely diced • 2 celery stalks, coarsely diced • 1/2 cup onion, chopped • 2 cloves garlic, minced • 2 tablespoons olive oil • 1 28-ounce can diced tomatoes, un-drained •