Good info to study re the thermocline and where fish won’t be as well as the Spring and Fall ‘turnover’ which could influence when you fish or how well you fish.

TURNOVER                                  THERMOCLINE                               THERMOCLINE

I always find this whole lake turnover event fascinating having witnessed it a few times. If you don’t recognize it for what it is you will swear your seeing things as stuff bubbles up and the lake almost visibly swirls. Lakes also turnover in the Spring or early Summer (more good lake info)