Products containing more than one-sixtieth fish, for example Worcestershire sauces containing anchovies or marshmallows containing fish gelatin, are certified by the Orthodox Union as "OU Fish". However, products containing less than one-sixtieth fish are not required to be labelled with the OU Fish hechsher as long as the fish ingredient is listed on the package. Dairy products containing fish that is not batel b'shishim are listed as OU Dairy Fish, to accommodate Sephardi Jews who do not mix fish and dairy.
