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Two scales of distribution and biomass of Antarctic krill (Euphausia superba) in the eastern sector of the CCAMLR Division 58.4.2 (55°E to 80°E)

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  • Martin J Cox
  • Gavin Macaulay
  • Madeleine J Brasier
  • Alicia Burns
  • Olivia J Johnson
  • Rob King
  • Dale Maschette
  • Jessica Melvin
  • Abigail J R Smith
  • Christine K Weldrick
  • Simon Wotherspoon
  • So Kawaguchi

Abstract

Regular monitoring is an important component of the successful management of pelagic animals of interest to commercial fisheries. Here we provide a biomass estimate for Antarctic krill (Euphausia superba) in the eastern sector of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) Division 58.4.2 (55°E to 80°E; area = 775,732 km2) using data collected during an acoustic-trawl survey carried out in February and March 2021. Using acoustic data collected in day-time and trawl data, areal biomass density was estimated as 8.3 gm-2 giving a total areal krill biomass of 6.48 million tonnes, with a 28.9% coefficient of variation (CV). The inaccessibility of the East Antarctic makes fisheries-independent surveys of Antarctic krill expensive and time consuming, so we also assessed the efficacy of extrapolating smaller surveys to a wider area. During the large-scale survey a smaller scale survey (centre coordinates -66.28°S 63.35°E, area = 4,902 km2) was conducted. We examine how representative krill densities from the small-scale (Mawson box) survey were over a latitudinal range by comparing krill densities from the large-scale survey split into latitudinal bands. We found the small scale survey provided a good representation of the statistical distribution of krill densities within its latitudinal band (KS-test, D = 0.048, p-value = 0.98), as well as mean density (t-test p-value = 0.44), but not outside of the band. We recommend further in situ testing of this approach.

Suggested Citation

  • Martin J Cox & Gavin Macaulay & Madeleine J Brasier & Alicia Burns & Olivia J Johnson & Rob King & Dale Maschette & Jessica Melvin & Abigail J R Smith & Christine K Weldrick & Simon Wotherspoon & So K, 2022. "Two scales of distribution and biomass of Antarctic krill (Euphausia superba) in the eastern sector of the CCAMLR Division 58.4.2 (55°E to 80°E)," PLOS ONE, Public Library of Science, vol. 17(8), pages 1-19, August.
  • Handle: RePEc:plo:pone00:0271078
    DOI: 10.1371/journal.pone.0271078
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    References listed on IDEAS

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    1. E. L. Cavan & A. Belcher & A. Atkinson & S. L. Hill & S. Kawaguchi & S. McCormack & B. Meyer & S. Nicol & L. Ratnarajah & K. Schmidt & D. K. Steinberg & G. A. Tarling & P. W. Boyd, 2019. "Author Correction: The importance of Antarctic krill in biogeochemical cycles," Nature Communications, Nature, vol. 10(1), pages 1-1, December.
    2. E. L. Cavan & A. Belcher & A. Atkinson & S. L. Hill & S. Kawaguchi & S. McCormack & B. Meyer & S. Nicol & L. Ratnarajah & K. Schmidt & D. K. Steinberg & G. A. Tarling & P. W. Boyd, 2019. "The importance of Antarctic krill in biogeochemical cycles," Nature Communications, Nature, vol. 10(1), pages 1-13, December.
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