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In situ target strength estimates of visually verified orange roughy
Citation
Macaulay, GJ and Kloser, RJ and Ryan, TE, In situ target strength estimates of visually verified orange roughy, ICES Journal of Marine Science, 70, (1) pp. 215-222. ISSN 1054-3139 (2013) [Refereed Article]
Copyright Statement
Copyright 2012 International Council for the Exploration of the Sea
DOI: doi:10.1093/icesjms/fss154
Abstract
The first estimates of orange roughy (Hoplostethus atlanticus) target strength at 38 and 120 kHz with visual verification were obtained from a self-contained echosounder and video camera system affixed to a demersal trawl towed through dense aggregations of spawning orange roughy. Mean target strength estimates were obtained from 24 tracks of orange roughy containing 83 echoes. The mean target strength at 38 kHz was –52.0 dB with a 95% confidence interval of –53.3 to –50.9 dB for fish with a mean length of 33.9 cm. At 120 kHz the mean target strength was –47.9 dB (confidence interval of –48.8 to –46.4 dB). This work makes two significant advances: in situ TS measurements have been made that can be confidently attributed to orange roughy, and using a trawl to herd orange roughy past the system resolved the previously intractable problem of fish avoidance.
Item Details
Item Type: | Refereed Article |
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Keywords: | acoustic, orange roughy, target strength, video |
Research Division: | Agricultural, Veterinary and Food Sciences |
Research Group: | Fisheries sciences |
Research Field: | Fisheries management |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the environmental sciences |
UTAS Author: | Kloser, RJ (Dr Rudy Kloser) |
ID Code: | 119540 |
Year Published: | 2013 |
Web of Science® Times Cited: | 12 |
Deposited By: | Fisheries and Aquaculture |
Deposited On: | 2017-08-02 |
Last Modified: | 2017-10-18 |
Downloads: | 0 |
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