Electroshocking fish to remove invasive species and count desirable species is routine. Done properly, the electroshock does not kill the fish.
I have seen it done by the DNRs of several states.
Rotenone works better. Just kill them all and restock.
The gov boys live area spraying!
“I have seen it done by the DNRs of several states.”
The company I worked for back in the 80s/90s built some electro-shock gear for the Oklahoma Department of Wildlife for population studies. The fisheries biologists would come by to pick up the orders and share stories with us.