Ours was teh same as well.They were encouraged to abstain from meat another day of the week and it wasn't a blanket dispensation, only some bishops granted that. I know our's did not. I don't see anything wrong with this, just the Catholic church recognizing and accepting the traditions of the Irish.
Golfgal the nuns were incorrect and I find it odd that a Catholic would want to perpetuate such a lie. I wish I had the link but there was no fish industry until modern times. Fish simply did not keep long enough to "be an industry" They fished and they sold it quickly. Also the meaning of the latin word used to discuss the abstaining truly only means "animal that spills blood" or something like that. Google is broken for me at the moment and I cannot find it I am sorry.
You should read the Canon Law 1251 again which is from 1983. You would be shocked to find out it isn't what you think it is. I'll post yet another link I had on this just to show

http://www.catholicdoors.com/faq/qu59.htm
I find a lot of Catholics go by what they are told. Not by what is in law. I was one of them for many years.