Some fish are structure related and prefer boulders, understanding the bottom is key to catching them.
Smallmouth bass, walleye and rock bass are 3 examples of fish that relate to boulders.
Sonar will show boulders as bumps on the bottom.
This image shows the boulders on the right as I use the StructureMap to show my location as I drive over the patch of hard bottom. The hard bottom is the white and the lake bottom mud is the dark on the StructureMap.
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