The use of predator-derived krill length-frequency distributions to calculate target strength

Andrew Stuart Brierley, K Reid

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The relationship between krill abundance and predator performance is fundamental to an ecosystem-based approach to resource management. We propose a method using krill sampled from the diet of predators to provide a length-frequency distribution of krill at times when it is possible to run automated shipboard acoustic systems but not to conduct scientific netting, i.e during logistic/resupply operations, This will allow a robust estimate of krill abundance to be calculated from acoustic data. Changes in the length-frequency distribution of krill over a period of a few weeks produced a 10% difference in TS, whereas simultaneous samples from predators and nets produced only a 1% difference, illustrating the need for simultaneous length-frequency data. By integrating data from land-based predators directly with automated on-board data collection systems it will be possible to gain important estimates of krill biomass at times of the season hitherto unavailable from shipboard scientific surveys.

Original languageEnglish
Pages (from-to)155-163
Number of pages9
JournalCCAMLR Science
Volume8
Publication statusPublished - 2001

Keywords

  • krill
  • target strength
  • length frequency
  • predators
  • diet
  • resource management
  • ecosystem
  • CCAMLR
  • ANTARCTIC KRILL
  • EUPHAUSIA-SUPERBA
  • SOUTH GEORGIA
  • SEASON

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