How to Use Your Electronics to Find Fish During the Summer

When summer heats up in Texas, lake water temperatures soar into the high 80s and 90s. Fish leave their shallow spring haunts and head out to deeper water where temperatures are more stable and oxygen levels are higher. Finding fish across vast expanses of open water can feel like searching for a needle in a haystack.

That’s where modern marine electronics become your ultimate game-changer.

Instead of burning gas driving blind or fishing empty water, learning to read your fish finder, side imaging, and live sonar will help you locate summer schools fast and put more fish in the boat.

1. Scan Offshore Structure with Side Imaging

Side imaging is the single best tool for covering large amounts of water in a short amount of time. During the summer, fish concentrate around off-shore cover and sharp depth changes.

  • Target High-Probability Areas: Cruise along main-lake points, river channel ledges, submerged roadbeds, humps, and deep timber.
  • Look for Cover & Shadow: Side imaging paints a clear picture of hard structure like brush piles, rock ledges, and drop-offs. Pay close attention to the acoustic shadows behind object returns—fish often hold tightly against the down-current side of structure.
  • Spot Individual Fish: Schooling game fish will often show up as bright, distinct white dots hovering around structure or suspended near bait schools.

2. Locate the Thermocline with 2D Sonar

In deep lakes during mid-to-late summer, the water column separates into distinct layers—a process called thermal stratification. The top layer is warm and oxygen-rich, while the deepest layer is cool but lacks oxygen. The boundary between them is called the thermocline.

  • Why It Matters: Game fish and baitfish will rarely go deeper than the thermocline because there is no oxygen below it. Recognizing this layer tells you the exact depth range you should target.
  • How to See It: Crank up your 2D sonar sensitivity slightly. The thermocline will appear as a subtle, continuous horizontal band of clutter or noise across your screen, usually between 15 and 30 feet deep depending on the lake.
  • Focus Your Depth: Once you identify the thermocline depth, focus all your fishing efforts right at or slightly above that line.

3. Find the Bait to Find the Game Fish

During summer pattern transitions, predator fish go wherever the food goes. If you find large balls of shad or sunfish, game fish won’t be far behind.

  • Identifying Bait Balls: On traditional 2D sonar or down imaging, baitfish appear as dense, cloud-like masses rather than distinct arches or lines.
  • Spotting Feeding Activity: Look for “slashes” or arcs cutting directly into or right underneath the bait cloud. This indicates active feeding zones where fish are actively pushing bait toward the surface or against structure.

4. Pinpoint Active Fish in Real-Time with Forward-Facing Sonar

Live imaging technologies (such as Garmin Livescope, Lowrance ActiveTarget, or Humminbird MEGA Live) have revolutionized summer fishing by showing you how fish respond to your lure in real time.

  • Track Suspended Schools: Summer fish frequently suspend in open water near deep channels. Forward-facing sonar lets you scan 360 degrees around the boat to locate these roving schools before making a cast.
  • Watch Lure Movement & Fish Response: You can literally watch your lure descend and see how fish react. If a fish tracks your bait but turns away, you know instantly to adjust your retrieve speed, change colors, or downsize your presentation.

5. Dial In Your Unit Settings for Summer Conditions

Having expensive electronics won’t help if your settings aren’t adjusted for deep, warm water:

  • Adjust Chart Speed: Match your chart speed to your boat’s trolling or idling speed so structure and sonar returns don’t look stretched out or smudged.
  • Fine-Tune Sensitivity/Gain: High water temperatures and summer algae blooms create extra water noise. Turn down gain slightly if your screen is too cluttered, but keep it high enough to pick up subtle bait returns.
  • Use Waypoints Wisely: When you idle over a deep brush pile or a school of fish on side imaging, drop a waypoint immediately. Boat drift and wind make it nearly impossible to return to the exact spot without a GPS marker.
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