Visit the Team Iceshanty Proshop
I believe after cooking they are dead. I've eaten them and I've only developed a couple black dots on my skin.
The "yellow grub" and "black spot" in perch and other fish are intermediate life stages of a type of trematode worm. See life cycle here:http://www.wildnh.com/Fishing/fisheries_management/grubby_fish.htm
A biologist one time in concord told me it was ok to eat bass with the black parisite in them as long as you cook the meat well you should have no problems.I seem to find that in some ponds that the perch have it and other have not. Not sure what the theory is behind it is but here is a pic of a perch with the pepper parasites in it. Now this pond is connected to another and the funny thing is that 1st pond i have never seen it and caught well over 1,000 perch out of it before and the 2nd. i have caught maybe 250 perch and seen about 15-20 with it in the bodies.http://i52.tinypic.com/wu1abn.jpg[/img]]