This is how desperate the fight to keep Asian carp from invading Lake Michigan has become: Biologists are talking about turning to sandbags. University of Wisconsin Sea Grantâ??s Phil Moy said Tuesday that Lake Michigan may be just one big rainstorm away from an infestation of the super-sized jumping carp that fishery experts fear could ravage whatâ??s left of the big lakeâ??s natural food chain.