Figure 19. Example EC150-3C echosounder echograms. Herring is resolved as individual target at the top outskirts of the layer observed at 60-150 m depth in Kvænangen fjord. Demonstration of advantage of rather narrow, (2.5) beamwidth to resolve individual targets at range. The broad band pulses of “fast” (upper panel) and “slow” (middle panel) taper were used. The narrowband pulses of 1 ms duration were also tested (lower panel).
