Journal Article

Acoustic target strength of capelin measured by single-target tracking in a controlled cage experiment

Roar Jørgensen and Kjell Olsen

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 59, issue 5, pages 1081-1085
Published in print January 2002 | ISSN: 1054-3139
Published online January 2002 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1006/jmsc.2002.1239
Acoustic target strength of capelin measured by single-target tracking in a controlled cage experiment

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Knowledge of the acoustic target strength (TS) of capelin, Mallotus villosus (Müller), is important to scale integrator outputs for use in acoustic surveys, but experimental measurements of capelin TS are scarce. This paper reports a new ex situ experiment on capelin TS. Small groups of the fish were kept in a large sea cage that allowed them to swim freely between 4.5 and 10 m deep. TS measurements were made vertically with a scientific split-beam echosounder. Differences in behaviour could induce at least a 5 db change in TS owing to changes in tilt angle. The observed mean TS for capelin from the local Balsfjord stock was >1 db higher than expected from the TS–length relationship for Barents Sea capelin used during abundance estimation.

Keywords: cage experiment; capelin; target strength; target tracking

Journal Article.  0 words. 

Subjects: Environmental Science ; Marine and Estuarine Biology

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