Clearheaded: “If those worms were ossur there’s no way the gedolim of the previous generation would have been (machshal) [nichshol] through ignorance.”
If you believe so, fine, and you are probably right. But we can’t pasken from that. We must assume, then, that HKB”H didn’t allow these worms into the fish which ended up in their mouths (like all the stories of non- kosher food which spoiled or were spilled before a godol inadvertantly ate it). Or, this species is only recently in such abundance (there is evidence for this). Or, someone is a complete onus for this until made aware.
Your rov, apparently, holds the anisakis is assur, otherewise why would you need to check packaged fish! He is apparently not convinced that the prevalence of anisakis is not sufficient to assur all fish. That’s just my take on his psak (which you heard directly!), I’m curious to know if it’s right. Could you ask him? Thanks
BTW, my line about the treife fish was just a joke. Sorry, I should have put a smiley 🙂