An innovative approach from across the pond. I wonder if something similar could help reduce the huge damage pike cause on some systems over here? The Conon springs to mind.
To reduce the Pike. Kill all Pike under 7 pounds and return the big ones over that weight.
You have to catch them first Sandy :D
Gill nets :)
Years ago I fished Loch Tulla and came across a net
at the mouth of the river Orchy,I heard that was for trapping pike.
A
The "electronic guidance system" used to move the carp off to the side into the pole fence holding pens is like the system I worked with in the summer of 1967 when I had a few months with the fisheries lab at Pitlochry. We were on the Farrar, staying at Struy, taking salmon out the fish lift chamber in the Aegis dam. Each row of poles was across the front of the Culligran station and we were trial and error to make a field between the cathode row and the anode row to keep the salmon away from the station outflows when generating. The error parts of the trial and error gradually filled the freezer at Struy! The field in the water effectively tingling or froze the fish. The larger the fish the greater the effect.
On the broader point it's clear that carp are a disastrous invasive species. Asian carp are even worse threatening complete eco-systems and turning clear ponds into mud holes. Not really a great issue in Scotland it seems they need warmer water during the spring in order to breed. Keptie Pond in Arbroath is full of them and they are clearly breeding, but that pond is quite small, very shallow and heats up rapidly in spring. The cormorants and goosanders keep them in check! ;D