Daas Yochid, thanks, I takeh meant nichshol.
I’m not sure what you mean with your statement “He is apparently not convinced that the prevalence of anisakis is not sufficient to assur all fish.”
In any case, I think he doesn’t feel anisakis is ossur for if he would’ve felt that way, he would have told me that fresh fish needs to be checked as well. Fish is fish, it doesn’t matter if it’s fresh or frozen. I think he feels that there’s a problem with commercially prepared fish (canned and frozen/packaged), but that doesn’t mean he thinks the anisaki worm is ossur.