In Manitoba we have two forms of walleye. They're not recognized as distinct subspecies but I suspect they are because they differ so much. In Lake Winnipeg and Lake Manitoba we have what we call Greenbacks. They're an open water, deeper bodied version of walleye. They travel great distances and attain HUGE lengths! Our provincial record was a greenback that measured 39 inches and is a world record for length. Every year 30-36 inch greenbacks are caught in the rivers which they run in the fall. The gold form is found in smaller lakes in the east, west, and north sides of the province. Also they're intermingled in the range of the greenbacks. They have a darker body and the typical walleye colouration. They also don't get as big. A trophy is around 28-32 inches and they're not nearly as deep bodied. There's been discussion that the Greenback may be similar to the Blue Walleye that is now extinct from Lake Erie. It was regarded as a separate subspecies. Genetic analysis has yet to be done.