Cook the bacon and reserve two tablespoons of bacon drippings. Place the drippings in a large pan that has a cover. Add onion, carrot, and celery to the pan and cook for about five minutes, stirring. Stir in the fish, potatoes, lemon juice, water, salt and pepper. Bring to a boil, then reduce heat and simmer, covered for about 10 minutes. Blend in the milk and the corn. Stir and heat - do not boil - until heated through. Sprinkle each serving with the crumbled bacon.
