Herring
"We were trying to understand the behavioral response of overwintering herring to predators (sea lions in our case). The equipment was deployed from a vessel at 300-ft depth to get the DIDSON and other equipment in the vicinity of the herring school. We collected data (downward) from above the school and from within the school (downward and horizontal)." The data were collected near Juneau, Alaska in collaboration with the Alaska Fisheries Science Center in Auke Bay.
Courtesy of Kevin Boswell, Dept of Oceanography and Coastal Sciences, Louisiana State Univ, Baton Rouge, Louisiana