Dude! Really! I can't find the article, but the lamprey eels are coming baaack! I remember swimming and diving into the Lake with those dead alewife, and didn't think anything of it. They're pretty silver fishies. LOL.
Were they on your side of the Lake as well?
http://www.seagrant.wisc.edu/greatlakesfish/sealamprey.html
http://dnr.wi.gov/org/water/fhp/fish/lakemich/Sea%20Lamprey%20and%20Alewifes.htm
Couple of years of wall to wall alewives........not dead because of lamprey though......too little and too many for the nasssty eelses.
Be nice to nice shark while he is gone...
:-)