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

R.A. Saunders, C. O'Donnell, R.J. Korneliussen, S.M.M. Fassler, M.W. Clarke, A.R. Egan, D. Reid

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7 Citations (Scopus)

Abstract

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
Original languageEnglish
Pages (from-to)1086-1098
JournalICES Journal of Marine Science
Volume69
Issue number6
DOIs
Publication statusPublished - 2012

Keywords

  • target-strength
  • high-frequencies
  • fish
  • identification
  • oceanography
  • swimbladder
  • mackerel
  • krill

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    Saunders, R. A., O'Donnell, C., Korneliussen, R. J., Fassler, S. M. M., Clarke, M. W., Egan, A. R., & Reid, D. (2012). Utility of 18-kHz acoustic data for abundance estimation of Atlantic herring (Clupea harengus). ICES Journal of Marine Science, 69(6), 1086-1098. https://doi.org/10.1093/icesjms/fss059