Check this out...
-Are there any splake or whitefish or tiger hybrids in Lake Michigan?
Splake, which are a cross between a brook trout and a lake trout, are stocked on a regular basis into Green Bay. Lake whitefish are native to Lake Michigan and the population has been increasing in recent years. Round whitefish, or menominees, are also native to Lake Michigan and their numbers are secure. Tiger trout, which are a cross between a brook trout and a brown trout, were stocked into the Wisconsin waters of Lake Michigan from 1974 through 1977. The program was discontinued due to poor returns.
Tiger trout are normally sterile, but i wonder if the ones they stocked were sterile or not. Definantly something to have a camera ready for.