Journal Article

<i>In situ</i> acoustic target strength of juvenile capelin

Richard L. O'Driscoll and George A. Rose

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 58, issue 1, pages 342-345
Published in print January 2001 | ISSN: 1054-3139
Published online January 2001 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1006/jmsc.2000.1015
In situ acoustic target strength of juvenile capelin

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A dispersed, monospecific aggregation of juvenile (0+) capelin was detected acoustically in shallow (20–70 m) water in Bonavista Bay, northeastern Newfoundland in January 2000. This provided a rare opportunity to measure acoustic target strength (TS) of very small (mean length=51 mm) capelin in situ. Mean observed TS at 38 kHz was −61.0 dB. Observed TS was similar to TS predicted by the Norwegian-Icelandic capelin TS-length relationship (TS=19.1 log L (cm)−74), but ∼2 dB lower than predicted by the existing TS-length relationship for capelin in Newfoundland waters at 38 and 49 kHz (TS=20 log L (cm)−73.1). Combining present data with previous 38 kHz data indicates the relationship TS=23.3 log L (cm)−77.1 (r2=0.95, n=6) for capelin of lengths 5–14 cm in Newfoundland waters.

Keywords: capelin; Mallotus villosus; target strength

Journal Article.  0 words. 

Subjects: Environmental Science ; Marine and Estuarine Biology

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