Sprinkle 1/2 c onions in baking pan. Place fillets over onions. Cover with remaining onions, celery, parsley, salt and pepper. Add enough water to cover fish; pour in oil. Arrange potatoes around fillets; turn potatoes to coat with liquid. Pour tomato sauce over mixture in casserole.
Bake at 350 degrees for 1 hour or until fillets and potatoes are tender.
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