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Abundance estimation of fish schools based on a relationship between school area and school biomass

Published online by Cambridge University Press:  15 February 2007

Ole Arve Misund
Ole Arve Misund*
Affiliation:
Institute of Marine Research, Fish Capture Division, PO Box 1870, N-5024 Bergen, Norway
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Abstract

A method for acoustic abundance estimation by horizontal guided sonar of fish schooling close tosurface is presented. The basic principle is to measure the horizontal area of schools in situ, and derive the school biomass subsequently through a school area to school biomass relationship. The application of the method is exemplified through a sonar survey in the eastern North Sea-Skagerrak in September 1990. The areas of recorded schools were measured by the estimate function of a Furuno CSH-70 sonar, and selected schools were captured by purse seine to establish a school-area to school-biomass relationship. In the actual region, the biomass of herrig (Clupea harengus) and mackerel (Scomber scombrus) was estimated to about 90 000 and 43 0000 tons, respectively. The accuracy of the method is discussed and improvements are suggested.

Keywords

Acoustic abundance estimationfish schoolssonarpurse seineherringmackerelEstimation acoustique de l'abondancebancs de poissonssenne tournanteharengClupea harengusmaquereauScomber scombrus
Type
Research Article
Information
Aquatic Living Resources , Volume 6 , Issue 3 , July 1993 , pp. 235 - 241
Copyright
© IFREMER-Gauthier-Villars, 1993

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