My husband is “The worm man” in a heimishe kashrus agency in Europe. Our Rabbonim permit eating fish with anisakis etc. This is according to the Shulchan Orach Yorah Deah 84. There is nothing new about these worms, they have been since the world was created. In Europe this is no news as the anisakis are well known by us and we’ve been eating them for thousands of years. There is one important thing to know; these worms are kosher as long as part of them is still in the flesh of the fish. When he exits completely his status changes and he is ossur. Therefore one must preheat whatever the fish is to be cooked in before putting in the fish fillet or minced. That is to prevent the worm from making a complete exit. If the fish was frozen there is no need to preheat since he is dead and will not come out.
From time to time there is someone who comes up with the news that there are some Rabonim that forbid the fish with anisakis and my husband checks with Rav P.E. Falk, and with Rav M. Vaie who verifies that the Gedolei Haposkim agree that there is no problem. There was a notice lately that claimed that many poskim forbid anisakis, Rav Vaie checked with some of the poskim who claimed the information is false. One of the Israeli Rabonim that forbids the anisakis gives a hechsher on 2 fish shops in Bnei Brak. They have some goites that pull out the worms from the fillets. It is interesting to note that Bnei Brak is full of Rabonim and Roshei Yeshiva and nobody requires the fish shops to remove the worms!!
My husband recomends that anybody interested should learn one Y”D 84 “Hilchos Toloim”. You will be surprised how many of them are kosher!!