Reply To: Worms In Fish

I was able to find the following:

[this is the way the matirim understand Rashi, the osrim disagree]

Another reason to be matir according to some is based on a checking process done by certain fish companies right after the fish are caught, which may make the sheratzim into a miut sheaino matzui and would therefore not require checking. This method is used in certain kinds of flounder.

I am in Torah Vodaath where Rav Belsky spoke numerous times about it, and this is just in very short, but there is much depth to it