Only battered in my area and mostly cod. And in lent it was Friday’s AND Wednesday’s. The only exception was the Friday after Thanksgiving. Richard Cardinal Cushing of Boston would always give a dispensation for that one Friday.
Decades later I traveled thru England on a tour that was too guided. All meals were plotted in advance. One mid Saturday afternoon whilst trudging on my own around some castle ruin in a small city, I noticed a fish & chips shoppe open. Of course I made a beeline for it and ordered some. Not only was it heavenly, it was exactly as greasy and wonderful as those I got on my way home from grammar school. One of the highlights of that trip.