Sound intensity is recorded by varying scales of black intensity marks on the chart paper. Output from the echosounder is also recorded digitally by a computer. We run our echosounder while steaming along transect lines during the daylight hours. This echosounder will record intensities of fish and zooplankton in the water below the ship to a depth of 250 m. Acoustic records will be later processed to determine actual biomass estimates . This is part of a chart for our zooplankton acoustic lines in the Strait of Georgia.
Black lines indicate our standardized transects.