In large stock pot, cook bacon over moderate heat until crisp. Remove the bacon from the pan, pat dry, and cut into small pieces. Drain the bacon grease from the stock pot and melt the butter in the same pot. Stir in the onion, carrots, celery, thyme, and bay leaf. Saute the vegetables until the onions are translucent. Add the vinegar. Slowly stir in the flour and cook 3 to 5 minutes. Stir in the paprika and cook 30 additional seconds. Pour in the fish stock, milk, cream, and water, stirring until the flour dissolves. Bring the mixture to a boil. Reduce heat and simmer for roughly 12 minutes, until the potatoes are tender. Add the corn, parsley, and fish chunks, and simmer until the fish is cooked through, which will take roughly 5 minutes. Stir in the bacon and salt and pepper to taste (I like a lot of black pepper). Serve. Makes about 3 quarts of chowder.