Lake trout typically spend most of their time in deep water. This is one of the primary reasons why they can be extremely elusive to anglers. However, do you really know why they like to be deep? The answer, in most bodies of water is that the lake trout are following the thermocline which is a temperature gradient in the water. If you’ve ever been on a big deep lake and you see a mess of interference on your sonar, chances are you could be looking at the thermocline. Lake trout typically like to hangout just under the thermocline where there is colder, more oxygenated water, and most forage such as ciscos. Therefore, especially in summer, if you’re looking for lake trout in a deep lake, look for the thermocline on your sonar and you might get lucky.