Heat olive oil in a large pot over medium heat. Sauté carrots, onions and celery for 5-6 minutes, stirring occasionally. Add red peppers and cook 5 minutes more until softened. Add broth, seasonings, zucchini and tomatoes and bring to a boil over medium-high heat. Reduce heat, cover and simmer for 5-6 minutes. Add fish and cook, covered, about 5 minutes more until fish is done. Season with salt and pepper and garnish with chopped parsley.