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Figure 9. Graphic depiction of our laboratory experiments shows a
live fish restrained in a mesh tube, which was rotated at 10 increments
while insonified with a broadband (35-95 kHz) signal. Fish rotation was
computer controlled and synchronized to the transmitted acoustic pulses.
Acoustic signals were digitally captured and analyzed for echo amplitudes
and pulse compression techniques over a spectrum of frequencies and fish
lengths. These types of laboratory measurements provide a foundation
for improving acoustic models to quantify variability in acoustic biomass
and fish length estimates.
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