I agree with esshup on the electroshock survey.

If over the course of last year, you were only catching 8-12 bluegill per outing, that sounds like an anemically low catch rate.

Just thinking past a shock survey, you would want to amp up that bluegill stocking rate to at least several hundred per acre, and implement a feeding program towards a goal of having large bass.

In any of my ponds, you would catch as many bluegill as you'd want in a given hour in warm weather.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."