Walleye and Sauger reproduce better in turbid water which is typical in slow flowing waters which are typically also high Mesotrophic to Eutrophic. Simply put the demersal fry, juveniles, and adults are very photosensitive (FWS/OBS-82/10.56).Because of the photosensitivity of these two species excellent Walleye and Sauger fishing can be had between McArthur and Seven Sisters Falls,certain areas around Minaki, as well as upstream sections from Kenora and the Norman Dam.
In Oligotrophic to low Mesotrophic waters Walleye and Sauger are most likely to be found in the deeper areas which provides protection from direct sunlight and stays cooler but limits your ability to practice safe catch and release especially during the months July and August.
Deeper waters in reference to safe catch and release without causing baro trauma for Physoclistous fish is considered in many publications (Ontario MNR, Minesota DNR) already fishing in depths below 20-25ft /6 to 7.5m or for sure below 30ft. Fishing in depths deeper than 45ft might lead to almost 100% mortality.
(There are two basic types of swim bladders in freshwater fish. Physostomous fish possess a pneumatic duct which connects the swim bladder to the alimentary tract. These fish, which include carp, esocids, trout, sturgeon and salmon, can expel gas and make buoyancy adjustments more quickly than Physoclistous fish. Physoclistous fish, which include bass, walleye, perch and most panfish, have closed swim bladders with no connecting duct between their swim bladder and alimentary tract. Deflation is accomplished by diffusion of gas via a network of capillaries. As a result, these species are unable to release air quickly (A Review of "Fizzing" - A Technique for Swim Bladder Deflation S. J. Kerr Fisheries Section Fish and Wildlife Branch Ontario Ministry of Natural Resources Peterborough, Ontario November, 2001)).
Pike, Musky and Smallmouth on the other hand do prefer the less turbid waters which, “as in our cases due to the fast flow velocity”, also stay generally cooler and offer larger sections of cool water during hot summer months. Sturgeon also reproduce better under these circumstances.
That’s why we are talking about the Pinawa Pike Classic!