The California Department of Water Resources is installing an experimental “bubble barrier” in a side channel of the Sacramento River that has become a graveyard for Chinook salmon migrating down stream to San Francisco Bay. This barrier is a sheet of bubbles with strobe lights and underwater acoustics designed to scare young salmon away from Georgina Slough. The salmon that end up in the slough become dinner for stripped bass and other predators, or get sucked up in to giant irrigation pumps.

via CBS