There are dozens of "You Tube" videos that last days, not just hours. "SEARCH" out whitefish, Lake Erie whitefish, history, commercial fishery, fish tugs, sport fishing, spear fishing, gill nets, trap nets, trawl nets and hook and line harvest. Basically whitefish are a Coldwater bottom feeder most of the year but they spawn in shallow rock bottoms in the late fall. After spawning they feed on other egg masses such as Lake Trout. In one year they and other cold waters fish disappeared. They disappeared in 1955 along with Ciscoes, Lake Trout, Blue Pike, etc. when another foreign invader in the cold waters appeared. It was the smelt, stocked in a Michigan lake to provide forage for the Lake Trout commercial fishery. These fish were not harvested out but their reproduction minnows were consumed by the hordes of smelt that appeared in all of the Great Lakes. In the mid 1960's Canadian Commercial fishermen converted to trawlers that harvested the smelt that were air freighted to Asian markets. Then Coho salmon that were easily produced to the Great Lakes and Chinook, King, Salmon. trout were stocked with this combined control methods that began to return the Perch, Walleye and Bass and new salmon and trout fishery to the hook and line sport fishing in in our Great Lakes that a few years earlier were considered "Dead Lakes." So in warm summer fishing go out to 60 to 90 foot of water using whitefish jigs available. You Tube has videos of the hook and line sport fishing methods and lures that you need to harvest these fine eating whitefish and also cleaning and cooking shows.