In a small tank, why couldn't you put a "boom" in the water and stand on the edge?
It seems like a census using fishing data would be inaccurate as I fish for one species at a time. Rarely will a bluegill bite a spinnerbait, though sometimes bass take a worm nicely.
Seining would have worked prior to renovation, but the banks are now so steep that I don't think it would be practical or successful. I guess I have three years to think on it. Electrofishing seems to be the easy way.
BTW- I acknowleged that in public waters any device like this is very illegal to even have on the boat. This is for census techniques.
