Fig. 7

Sonar tag acoustic data suggestive of the deep scattering layer. a One hour subset of acoustic data associated with translocated seal #3 collected in deep waters at the mouth of Monterey Canyon (region 3 in Fig. 2). b Zoom-in showing strong targets consistent with perhaps fish or squid observed to ranges in excess of 15 m at depths of 280–340 m. c Volume backscattering strength averaged in 1-m depth bins consistently showing enhanced scattering in the 280–340 m depth range during the three passes made through this layer