When and why were Catholics required to eat fish on Friday?

Question

When I was young we couldn't eat meat on Friday.  This was a question that

Answer

cause they couldn't have meat every friday so they substituted fish

Answer

Some catholics observe no meat Friday.
It is a meat fast. I.e. refrain from eating meat.
They practice this fast specifically during holy Friday. Some continue the practice every Friday of every week.

When and why were Catholics required to eat fish on Friday?

Answers (2)