Biological and physical fields were surveyed underway
using the BIOMAPER-II towed profiling vehicle equipped
with conductivity–temperature–depth (CTD) sensors, fluorometer,
transmissometer, a Hydroacoustic Technology
Instruments echosounder with five pairs of upward–downward
acoustic transducers over a range of frequencies, and
a VPR. Acoustic
data collected using the BIOMAPER-II were presented in
Lawson et al.; the present paper focuses on
analysis of the VPR data