A PC-based echo integrator system appliable for school structure analyzis
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A low cost system for integration of echo signals on a PC has been developed. The system calculates the area backscattering strength in surface and bottom layers, and is designed both for the purpose of conventional acoustic abundance estimation and for quantification of fish school structure. The system has been installed onboard R/V "Fjordfangst" (20 GRT), and echo integration trials of herring schools have been conducted in Northern Norway. These measurements revealed great variations in internal packing density of the schools.