The Zooplankton Acoustic Profilers (ZAP) are 200 kHz inverted echosounders. They ping every 2 seconds and record the vertical and temporal variations in zooplankton and fish concentrations in the water column. Shown here is a strip-chart version of the data from the Eastern Strait of Georgia platform at 170 m water depth. This display is updated daily. A similar strip-chart is available for the Saanich Inlet ZAP data. Individual hourly plots are also available.