Volume backscattering strength of ice krill (Euphausia crystallorophias) in the Amundsen Sea coastal polynya

Volume backscattering strength (Sv in dB re 1 m−1) of ice krill (Euphausia crystallorophias) was observed at two frequencies (38 and 120 kHz) with a calibrated split-beam echosounder system in the Amundsen Sea coastal polynya. The horizontal and vertical scattering layers in the upper 200 m of the water column were known with the existence of predominant ice krill (>95%) in this region. Acoustic identification using a two-frequency dB window...