Is this a thermocline?

[jandscattleco]

Was at Normandy last night and both depth finders kept showing this. One is a HB 581hd DI and the other is a Piranamax 150. At first the contrast was up, turned it down. Then surface clutter was off, turned it on. Still could never get rid of this. The thing is, it was not always at the top like this. It would be at the top to 8', then around 10' to 15', just everywhere.

It showed it on both sonar and down imaging.


Could this be the thermocline?


Second picture is the baitfish going around my fishing light. Pretty cool.