Abstract
This study shows that the vertical migration speed of sound scattering layers (SSLs ), which is distributed in near Funka Bay , were measured by 3D velocity components acquired from a bottom moorng ADCP . While the bottom mooring type has a problem to measure the velocity vectors of sound scattering layer distributed near to surface , both the continuous vertical migration patterns and variability of backscatterers were routinely investigated as well . In addition , the velocity vectors were compared with the vertical migration velocity estimated from echograms of Mean Volume Backscattering Strength , and estimated to produce observational bias due to SSLs which is composed of backscatterers such as euphausiids , nekton , and fishes have swimming ability
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