It is rather common this time of year not sure if it is fatal or not. Were they the small tannish ones about 1/4 to 1/2 inch or the bigger ones blackish to brownish in color?
I have been seeing the smaller tan colored ones for quite awhile this year. Dont remember what fish type they were attached to though. The sheeps need some thinning out , one of the worst years for keeping sheephead off the hooks.
Good point...as I clean my own,...
Perch issue