Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba

Using known-age Antarctic krill (Euphausia superba) grown from eggs hatched at two different laboratories, we validate the annual pattern of bands deposited in the eyestalks of krill and determine the absolute age of these animals. Ages two through five years were validated, and these animals ranged...

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Published in:PLOS ONE
Main Authors: Kilada, R, Reiss, CS, Kawaguchi, S, King, RA, Matsuda, T, Ichii, T
Format: Article in Journal/Newspaper
Language:English
Published: Public Library of Science 2017
Subjects:
Online Access:https://eprints.utas.edu.au/26556/
https://eprints.utas.edu.au/26556/1/journal.pone.0171773.pdf
id ftunivtasmania:oai:eprints.utas.edu.au:26556
record_format openpolar
spelling ftunivtasmania:oai:eprints.utas.edu.au:26556 2023-05-15T13:31:53+02:00 Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba Kilada, R Reiss, CS Kawaguchi, S King, RA Matsuda, T Ichii, T 2017 application/pdf https://eprints.utas.edu.au/26556/ https://eprints.utas.edu.au/26556/1/journal.pone.0171773.pdf en eng Public Library of Science https://eprints.utas.edu.au/26556/1/journal.pone.0171773.pdf Kilada, R, Reiss, CS, Kawaguchi, S, King, RA, Matsuda, T and Ichii, T 2017 , 'Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba' , PLoS ONE, vol. 12, no. 2 , pp. 1-14 , doi:10.1371/journal.pone.0171773 <http://dx.doi.org/10.1371/journal.pone.0171773>. eyestalks Antarctic krill age determination Article PeerReviewed 2017 ftunivtasmania https://doi.org/10.1371/journal.pone.0171773 2021-09-13T22:17:34Z Using known-age Antarctic krill (Euphausia superba) grown from eggs hatched at two different laboratories, we validate the annual pattern of bands deposited in the eyestalks of krill and determine the absolute age of these animals. Ages two through five years were validated, and these animals ranged from 37.1 to 62.6 mm in total length. The band counts in these individuals were either identical to their absolute ages, or only failed to agree by a few months, which demonstrates the accuracy of this method. Precision and bias were estimated graphically using Chang’s index (Coefficient of Variation = 5.03%). High accuracy and precision between readers and low ageing bias indicate that longitudinal sections of eyestalks can be used to age krill in wild samples and to develop age-based stock assessment models for krill. Archival samples preserved in formalin (5%) and stored in ambient conditions were also readable. Ageing preserved krill will provide the opportunity to examine changes in growth among krill populations within the Southern Ocean and to retrospectively examine changes in krill production over the last century to better understand the historical and future impacts of climate change on this critical Southern Ocean species. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean University of Tasmania: UTas ePrints Antarctic Southern Ocean PLOS ONE 12 2 e0171773
institution Open Polar
collection University of Tasmania: UTas ePrints
op_collection_id ftunivtasmania
language English
topic eyestalks
Antarctic krill
age determination
spellingShingle eyestalks
Antarctic krill
age determination
Kilada, R
Reiss, CS
Kawaguchi, S
King, RA
Matsuda, T
Ichii, T
Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba
topic_facet eyestalks
Antarctic krill
age determination
description Using known-age Antarctic krill (Euphausia superba) grown from eggs hatched at two different laboratories, we validate the annual pattern of bands deposited in the eyestalks of krill and determine the absolute age of these animals. Ages two through five years were validated, and these animals ranged from 37.1 to 62.6 mm in total length. The band counts in these individuals were either identical to their absolute ages, or only failed to agree by a few months, which demonstrates the accuracy of this method. Precision and bias were estimated graphically using Chang’s index (Coefficient of Variation = 5.03%). High accuracy and precision between readers and low ageing bias indicate that longitudinal sections of eyestalks can be used to age krill in wild samples and to develop age-based stock assessment models for krill. Archival samples preserved in formalin (5%) and stored in ambient conditions were also readable. Ageing preserved krill will provide the opportunity to examine changes in growth among krill populations within the Southern Ocean and to retrospectively examine changes in krill production over the last century to better understand the historical and future impacts of climate change on this critical Southern Ocean species.
format Article in Journal/Newspaper
author Kilada, R
Reiss, CS
Kawaguchi, S
King, RA
Matsuda, T
Ichii, T
author_facet Kilada, R
Reiss, CS
Kawaguchi, S
King, RA
Matsuda, T
Ichii, T
author_sort Kilada, R
title Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba
title_short Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba
title_full Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba
title_fullStr Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba
title_full_unstemmed Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba
title_sort validation of band counts in eyestalks for the determination of age of antarctic krill, euphausia superba
publisher Public Library of Science
publishDate 2017
url https://eprints.utas.edu.au/26556/
https://eprints.utas.edu.au/26556/1/journal.pone.0171773.pdf
geographic Antarctic
Southern Ocean
geographic_facet Antarctic
Southern Ocean
genre Antarc*
Antarctic
Antarctic Krill
Euphausia superba
Southern Ocean
genre_facet Antarc*
Antarctic
Antarctic Krill
Euphausia superba
Southern Ocean
op_relation https://eprints.utas.edu.au/26556/1/journal.pone.0171773.pdf
Kilada, R, Reiss, CS, Kawaguchi, S, King, RA, Matsuda, T and Ichii, T 2017 , 'Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba' , PLoS ONE, vol. 12, no. 2 , pp. 1-14 , doi:10.1371/journal.pone.0171773 <http://dx.doi.org/10.1371/journal.pone.0171773>.
op_doi https://doi.org/10.1371/journal.pone.0171773
container_title PLOS ONE
container_volume 12
container_issue 2
container_start_page e0171773
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