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

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

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

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

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

or: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.

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