hello99:
I agree that an intelligent conversation would be wonderful, I just don’t know if I can live up to that, but I’ll try!
I didn’t make up that the worm should be considered part of the krill, I got it from Rav Belsky’s statement that the heter of mino gavli is that the worm becomes mutor as part of the fish.
If it is poresh, it would presumably now have its own status.
As far as your second point, I don’t see how the existance of various stages precludes the possibility that it might have swallowed a worm in the free swimming stage. Chazal were definitely concerned that this could happen, which is why the Shulchan Aruch does not permit worms fould in the b’nei meiayim.
In your previous post, you discuss the heter which is based on predation (that the anisakis are continually tranferred from creature to creature). If indeed, we were to know for a fact that they are swallowed when microscopic, I could easily hear a sevoro to be matir. However, the most compelling part of the argument of the matirim is lost; that we can assume that what we see today is the same as what was seen in the times of the S.A. and gemoro.
The gemoro, and S.A. with meforshim, clearly deal with the issue of whether the worms come “meialmo” or are “mino gavli”. A worm found in the flesh is “mino gavli”, and one in the viscera is “meialmo”. This argument, however assumes that even worms which came form the outside are mutor! This would only make sense if we now are seeing a different species than is described in the gemoro!