Once you get use to seeing it on your sonar then you can experiment with that on your own body of water. Say the thermocline is at 26 ft in 32 ft of water,then in a lake that the average depth is 30 ft or so....I would say that fish found on a brush pile in 24 ft of water as "deep". Generally speaking though remember that fish will use deeper water in lakes that are clearer and deeper,and shallower in dingy water with an overall shallower depth.Typically in a lake with deepest water of 60 ft say I would expect to find the "deep fish" around 30 ft or so. A lake with 100 ft water or more maybe 40 to 60 ft is possible. I generally do not find fish in the absolute deepest water...except in a really shallow lake (or river) say 30 ft deep or so deepest water.

Some species like catfish will hang out around the thermocline,you can't see them on some graphs sometimes...won't separate the return of the thermocline and the fish.

Several things factor into that,clarity,actual temp difference,actual water temp average, how close the cline is to the bottom ,the bottom type ,etc.


This is a good thing to experiment with and learn on the water .