A PC-based echo integrator system appliable for school structure analyzis

• Main Authors: Floen, Svein, Totland, Bjørn, Øvredal, Jan Tore, Misund, Ole Arve
• Format: Report
• Language: English
• Published: ICES 1991
• Subjects: acoustics; akustikk; stock assessment; bestandsberegning; gear experiments; redskapsforsøk; VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924; VDP::Technology: 500::Information and communication technology: 550::Computer technology: 551; Norway; Northern Norway
• Online Access: http://hdl.handle.net/11250/104862

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.