cooler deeper water tends to have the lowest level of oxygen during this period. Musky tend to populate the upper water levels when they are active and the lower water levels when they are inactive. The hotter the top layer of water, the more likely Musky are to seek a comfortable temperature at greater depths. At these greater depths, they are less likely to be aggressively active. As summer transitions to fall and the water looses its heat to the longer cooler evenings, the temperature difference between the thermal layers of the lake become less distinct. Most of the oxygen is still located in the surface layer of the water and Musky tend to be more active during this time. Typically this time is associated with late August and early September. Temperatures will vary depending upon the geographic location and the depth of the body of water so you should keep a close watch upon the water that you plan to regularly fish. The graphic at the right will provide you some perspective regarding this gradual shift in water temperatures. NOTE: One should also remember that, depending on the spring warm up, pre-summer and “Imminent Turnover” are relatively the same water conditions.