Journal Article

The acoustic target strength of herring (<i>Clupea harengus</i> L.) in the northern Baltic Sea

Heikki Peltonen and Helge Balk

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 62, issue 4, pages 803-808
Published in print January 2005 | ISSN: 1054-3139
Published online January 2005 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1016/j.icesjms.2005.02.001
The acoustic target strength of herring (Clupea harengus L.) in the northern Baltic Sea

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The hydro-acoustic target strength (TS) of herring (Clupea harengus L.) was estimated from the catch composition of 19 pelagic-trawl hauls and from simultaneous recordings with a split-beam, 38 kHz echosounder. The data were collected in September 2000 during a Bothnian Sea survey in the northern Baltic Sea. The dependence of TS (in dB) on fish length (L, cm) was modelled with the equation TS = a log10 L + b. The fitted model was TS = 16.8 log10 L − 60.0. With a predefined slope of 20 the TS vs. log-fish length relationship was TS = 20 log10 L − 63.9. The analyses suggested that TS was higher in the Bothnian Sea than is assumed in most studies in the Baltic Sea. Applying the revised TS–length dependence considerably enhanced the agreement between the biomass estimates from hydroacoustics and those from a catche-at-age analysis (VPA).

Keywords: Baltic Sea; herring; hydroacoustic; target strength; TS; VPA

Journal Article.  3632 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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