Extreme low visibility fluorocarbons by Stren and Seaguar are expensive, but incredibly effective on wary bluegills. I'll close this article by speaking to electronics. The modern day bluegill angler should never leave home without a flasher. My Vexilar FL-8 is as an important part of the complete arsenal as is an auger. This upgraded version of Aquaview's original underwater camera comes in completely self-contained package and with an infrared lens, which improves visibility in low light.
Underwater cameras assist in researching structure.
With my Aquaview II I'm able to identify green weeds, find pockets in a weed bed, determine bottom content, and even watch fish react to a presentation. So when the crappies get lockjaw, walleyes retreat, and big pike seem to disappear, there's a remedy at hand. Go get the blues - that is, bluegills.