I heard that the original intent of forbidding meat on Fridays and during Lent was to save the fishing industry in Italy. As such, I do not follow this convention.
I have heard that, too. It's malarkey. Sadly, some folks are too eager to believe malarkey about any particular Group X that they are not part of.
The Greek Orthodox forbid the consumption of (vertebrate) fish AND meat during Lent. Was that to save the shellfish industry in Greece?
Little reality check: there has never, ever, not for one moment, been any requirement for Catholics to eat fish. Not on Fridays, not in Lent, not ever. The requirement is to abstain from the flesh of mammals and birds, that is, warm-blooded animals. They (that is, we) can eat fish if we want to. It's not required.
Maybe it was really to save vegetable farmers in Italy. Maybe it was to promote the invention of eggplant parmigiana. Who knows ... [sigh].