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Utility of 18-kHz acoustic data for abundance estimation of Atlantic herring (Clupea harengus)

Saunders, Ryan A.; O'Donnell, Ciaran; Korneliussen, Rolf J.; Fassler, Sascha M. M.; Clarke, Maurice W.; Egan, Afra; Reid, Dave. 2012 Utility of 18-kHz acoustic data for abundance estimation of Atlantic herring (Clupea harengus). ICES Journal of Marine Sciences, 69 (6). 1086-1098. 10.1093/icesjms/fss059

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Abstract/Summary

Current acoustic survey protocols for Atlantic herring (Clupea harengus) abundance estimation are principally dependent upon 38-kHz backscatter data. This can constitute a substantial problem for robust stock assessment when 38-kHz data are compromised. Research vessels now typically collect multifrequency data during acoustic surveys, which could be used to remediate such situations. Here, we investigate the utility of using 18- and 120-kHz data for herring abundance estimation when the standard 38-kHz approach is not possible. Estimates of herring abundance/biomass in the Celtic Sea (2007–2010) were calculated at 18, 38, and 120 kHz using the standard 38-kHz target-strength (TS) model and geometrically equivalent TS models at 18 and 120 kHz. These estimates were compared to assess the level of coherence between the three frequencies, and 18-kHz-derived estimates were subsequently input into standard 38-kHz-based population models to evaluate the impact on the assessment. Results showed that estimates of herring abundance/ biomass from 18 and 38 kHz acoustic integration varied by only 0.3–5.4%, and acoustically derived numbers-at-age estimates were not significantly (p . 0.05) different from 1:1. Estimates at 120 kHz were also robust. Furthermore, 18-kHz-derived estimates did not significantly change the assessment model output, indicating that 18-kHz data can be used for herring stock assessment purposes.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1093/icesjms/fss059
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Ecosystems
ISSN: 1054-3139
Additional Keywords: Celtic Sea, Stock assessment
NORA Subject Terms: Marine Sciences
Date made live: 18 Jul 2012 15:31
URI: http://nora.nerc.ac.uk/id/eprint/18808

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