I'd think it was the shocking boat sampling the fish population. They run a big john boat down here and they use a generator to shock the fish into nets for collection. They put the fish they catch in a big tank of water and then stop about ever 15 minutes to count, measure and record the catch. They they will sample for another 15 minutes. I'll bet that it's the Kentucky DNR doing lake sampling. They tend to conduct these lake surveys at night in the summer months. And they do tend to follow the shoreline when doing these surveys. I have watched the IN DNR fishery biologist do these surveys on two occasions. You may want to talk to them after they finish their survey later that night and see what they caught. It's very interesting to see what type of fish are in the water.

I got to work on one of these shocking boats once on the Wabash River when I was still going to school. We caught all type of big river fish that day. When the fish get shocked they swim up to the surface and are stunned for just a few seconds and then you use a long handled net to capture the fish at the surface and put it into a holding tank on the boat. The fish come fast and furious at times and it's hard to catch all of them. Normally two guys will stand up at the front of the boat and capture the stunned fish. It's very interesting to see this done.

Regards,

Moose1am