I'll tell you this and maybe it will help. I shocked a 28 acre lake full of common carp. We tookout so many it almost sank the boat ( 3 times) I was hired for a return visit just for carp removal and not an anlysis, again filled the boat 2 times full of carp. We did not use gill nets, maybe that would have worked? We drained the lake last year since it still full of carp and had other trash fish species and is on its way back to becoming a nice fishery. MY point is I doubt you can takeout enough with electrofishing. Gill nets may work, we also on another project had good success with an umbrella net placed on a boat dock. The owner fed and tookout fish and in his case got the numbers way down, but did not have too many when we started. Good luck!

Greg Grimes
www.lakework.com