Journal Article

Target Strength of encaged Atlantic redfish (<i>Sebastes</i> spp.)

Stéphane Gauthier and George A. Rose

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 58, issue 3, pages 562-568
Published in print January 2001 | ISSN: 1054-3139
Published online January 2001 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1006/jmsc.2001.1066
Target Strength of encaged Atlantic redfish (Sebastes spp.)

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Redfish (Sebastes spp.) were caught at sea with feather hooks, kept alive in sea cages for >12 hours at 30 m depth, then transferred to cages at 10 m depth for another 12 h. Most fish survived this procedure in excellent condition. A total of 16 fish of length 24.5–30 cm were placed one at a time in an acoustically inert monofilament cage where target strength (TS) was measured for two hours using a 38 kHz split-beam echo-sounder. An underwater video camera enabled continuous monitoring of fish and cage. The best fit length based regression obtained from these data was TS=19 log [length (cm)]−66.6, in the standard format: TS=20 log [length (cm)]−68.1 (r2=0.18). TS varied by less than 4 dB over a range of tilt angles from −50° to 70° off dorsal aspect.

Keywords: Redfish; Sebastes spp.; target strength

Journal Article.  0 words. 

Subjects: Environmental Science ; Marine and Estuarine Biology

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