Can't see the thermocline on my Humminbird 570. Adjusted all the settings but still can't see it...what settings do I need to adjust to see the thermocline. I fish Belton lake and want to try drifting...just don't want to drift where there is no fish. Any help would be greatly appreciated.

Im interested in this as well. I think i found it on another lake last weekend by turning the sensitivity way up. At least when i did, i found a constant line at about 24'. I just assume that was the thermocline.

Years ago my friend told me to look for a line just like you described that you should see on your sonar, but he could see it on a old type flasher unit as a steady line as well, sometimes it doesn't show. He said if you couldn't see a line just look at the depth the fish are being marked. He told me this happens at lake Whitney every year, when the lake is at normal level it occurred about 15 - 21ft. He said when Whitney was like this, they caught catfish a the depth of 8ft. I hope this info helps!

Turn up the sensitivity and you will see a noticeable difference in the clutter above the thermocline along with not many fish below it. I like drifting down the sides of humps in deep water.

Thanks for all the help...taking Friday off to try and find the elusive cats...and thermocline with my new graph.

Yup.

Downside is always dependant on which direction you are heading though.

I like to drift upside as well

You do everything backards anyway!! Lol

Did your thermocline disappear for a few days up that way Tom?

it seemed that way. i thought lewisville was gonna turn over last week but it hasnt yet

Turnover is many weeks off until the surface temps start dropping. They are currently increasing. Most Texas lakes, the thermocline is now well formed and still stratified, but remains deep. Been collecting profiles for a couple years watching the changes. Here's this mornings temp profile:

Just because you can't see it doesn't mean it isn't there. And if it is there, it doesn't mean you can't catch fish below it either. We caught two "dead" fish on Grapevine and 1 on Lewisville already this summer. These fish died within 5 minutes or so of us getting bit on those rods. Went to check the baits and reeled in dead fish. Pretty obvious these fish were below the thremocline. But I was marking other fish that deep and they were biting. You have to learn to trust your electronics. The fish finder is there to tell you if there are or are not any fish under your boat. If you're not marking or catching fish don't waste your time there.

Lewisville usually turns over around October 13th. Grapevine was a bit later this past year if I remember correctly.

I have a 1198c and I cant find one eather. but I did find some fish in 6ft.of water up to 22#I wish I could find that thermicline,after 78 yrs I give up. thanks mel petty

Saw you out there chasing those scaley fish yesterday morning. I won't tell if you don't

The thermocline doesn't show up as well on the color units as it did on the older black and white graphs. I remember on my old Eagle 480 and an older HB Wideview it stuck out like a sore thumb. If you're marking fish deeper than 22' then don't worry about it. I did some trolling yesterday morning for hybrids and marked fish down to about 40 feet deep. Not just one or two, but larger schools of fish and some bait.

I have heard that the aerator on Grapevine affects the thermocline but would be incline to think that would only be the case in the location right around the aerator.

It seems like I have been catching fish less than 20' recently, but I can remember catching fish in almost 40' of water last September and the water was still plenty hot.

Hope this clears things up a bit. The thermocline shown on your fish finder indicates a temperature change. A fish finder CAN NOT indicate disolved oxygen levels. Sometimes in the summer fish won't go deep because the dissolved oxygen levels at a certain depth and below will not be suficient for fish to survive. There is often a big difference in the depths of the thermocline and where the oxygen levels become too low for the fish. Sometimes they are about the same. If you really want to get technical about it buy one of the water quality monitoring devices used by our TPWD biologist or water utility districts. Drop the probe down and record the depth, O2 levels and temps. Best advice I can give you is to fish where you mark fish and where you feel confident you can catch fish.