This week the Fisheries Blog describes how carbon dioxide can be used as a barrier for fish movement. This work should be of particular interest to CARS members, as there is hope that this technology could be used to prevent Asian carp, like Silver and Bighead Carp from entering the Great Lakes via the Chicago Sanitary and Shipping Canal. Also, much of the ‘proof of concept’ work and followup studies are being completed by CARS members led by Cory Suski at the University of Illinois.