you will need

1/2 cup butter, 4tbs chopped onions, 1 1/3 cups chopped celery, 4 tbs chopped green pepper, 1/2 cup flour, 5 cups canned tomatoes,
2/3 cup water,2 bay leafs, 1 1/2 lb fish cooked and flaked apart,
salt to tast

melt butter in larg skillet or pot, add onion, celery and green pepper
simmer about 5 minutes stirring frequently.
blend in flour, add tomatoes and water, and stir until sauce boils and thickens.
add bay leafs fish and salt cover and simmer for about 15 minutes
remove bay leafs and serve hot over mashed or baked potatoes or rice