New bubble barrier at the junction of the Sacramento River (right) and Georgiana Slough (left) in the Sacramento–San Joaquin River Delta. Photo by DWR. 

DWR: Video: Georgiana Slough Effectiveness Study

From the Department of Water Resources:

DWR is leading the Georgiana Slough Effectiveness Study in partnership with UC Davis. This study involves the tagging and tracking of juvenile salmon in the Sacramento River to determine how well the non-physical barrier along Georgiana Slough is keeping fish out of the interior Delta and away from State. Water Project export facilities.