Age determination and growth of Atlantic redfish (Sebastes marinus and S. mentella): bias and precision of age readers and otolith preparation methods
16 pages, 10 figures. Age determination of Atlantic redfish (Sebastes spp.) has proven difficult and has led to inconsistent age and growth estimates in the past. Using otoliths of the two major commercial species, golden redfish (Sebastes marinus) and deep-sea redfish (S. mentella), a series of exc...
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International Council for the Exploration of the Sea
2005
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ftcsic:oai:digital.csic.es:10261/9441 2023-05-15T15:27:58+02:00 Age determination and growth of Atlantic redfish (Sebastes marinus and S. mentella): bias and precision of age readers and otolith preparation methods Stransky, Christoph Gudmundsdóttir, Sif Sigurdsson, Thorsteinn Lemvig, Svend Nedreaas, Kjell Saborido-Rey, Fran 2005 539622 bytes application/pdf http://hdl.handle.net/10261/9441 https://doi.org/10.1016/j.icesjms.2005.01.018 eng eng International Council for the Exploration of the Sea Oxford University Press http://dx.doi.org/10.1016/j.icesjms.2005.01.018 ICES Journal of Marine Science 62(4): 655-670 (2005) 1054-3139 http://hdl.handle.net/10261/9441 doi:10.1016/j.icesjms.2005.01.018 openAccess Age determination Bias Growth North Atlantic Precision Redfish Sebastes marinus Sebastes mentella Artículo 2005 ftcsic https://doi.org/10.1016/j.icesjms.2005.01.018 2018-08-21T23:17:44Z 16 pages, 10 figures. Age determination of Atlantic redfish (Sebastes spp.) has proven difficult and has led to inconsistent age and growth estimates in the past. Using otoliths of the two major commercial species, golden redfish (Sebastes marinus) and deep-sea redfish (S. mentella), a series of exchange schemes was carried out to assess bias and precision of age readings between four readers and between two preparation methods. Considerable bias between readers and moderate precision were observed for the S. marinus readings, especially for ages >20 years, with coefficients of variation (CV) of 7.7–12.0% and average percent error (APE) of 5.4–8.5%. Agreement between readers increased from 17–28% to 45–61% when allowing deviations of ±1 year, and to 80–92% with ±3 years tolerance. The age of S. marinus determined from broken and burnt otoliths was estimated to be slightly lower than when the age of the same individuals was determined from thin-sectioned otoliths. The bias and precision estimates obtained from the S. mentella material were generally poorer than for S. marinus (CV 8.2–19.1%, APE 5.8–13.5%), but similar to reported values for other long-lived fish species. Better than 50% agreement was only achieved with ±3 years tolerance. Growth rates differed significantly between species, confirming slower growth for S. mentella. For S. marinus, only one reader comparison revealed significantly different growth functions, whereas almost all S. mentella reader pairs showed significant differences in growth curves. Section and break-and-burn readings of S. marinus did not differ significantly. Average ages of around 9–10 years were determined for juvenile S. mentella 24–30 cm long, which were likely to have migrated from East Greenland into the Irminger Sea, based on earlier observations. As some of the error in the age determinations presented could be attributed to interpretation differences between readers, further intercalibration of redfish ageing is urgently needed in order to provide consistent input data for stock assessment. The work was partly funded by the European Commission within the REDFISH project (QLK5-CT1999-01222). Peer reviewed Article in Journal/Newspaper Atlantic redfish East Greenland golden redfish Greenland North Atlantic Sebastes marinus Sebastes mentella Digital.CSIC (Spanish National Research Council) Greenland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) ICES Journal of Marine Science 62 4 655 670 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Age determination Bias Growth North Atlantic Precision Redfish Sebastes marinus Sebastes mentella |
spellingShingle |
Age determination Bias Growth North Atlantic Precision Redfish Sebastes marinus Sebastes mentella Stransky, Christoph Gudmundsdóttir, Sif Sigurdsson, Thorsteinn Lemvig, Svend Nedreaas, Kjell Saborido-Rey, Fran Age determination and growth of Atlantic redfish (Sebastes marinus and S. mentella): bias and precision of age readers and otolith preparation methods |
topic_facet |
Age determination Bias Growth North Atlantic Precision Redfish Sebastes marinus Sebastes mentella |
description |
16 pages, 10 figures. Age determination of Atlantic redfish (Sebastes spp.) has proven difficult and has led to inconsistent age and growth estimates in the past. Using otoliths of the two major commercial species, golden redfish (Sebastes marinus) and deep-sea redfish (S. mentella), a series of exchange schemes was carried out to assess bias and precision of age readings between four readers and between two preparation methods. Considerable bias between readers and moderate precision were observed for the S. marinus readings, especially for ages >20 years, with coefficients of variation (CV) of 7.7–12.0% and average percent error (APE) of 5.4–8.5%. Agreement between readers increased from 17–28% to 45–61% when allowing deviations of ±1 year, and to 80–92% with ±3 years tolerance. The age of S. marinus determined from broken and burnt otoliths was estimated to be slightly lower than when the age of the same individuals was determined from thin-sectioned otoliths. The bias and precision estimates obtained from the S. mentella material were generally poorer than for S. marinus (CV 8.2–19.1%, APE 5.8–13.5%), but similar to reported values for other long-lived fish species. Better than 50% agreement was only achieved with ±3 years tolerance. Growth rates differed significantly between species, confirming slower growth for S. mentella. For S. marinus, only one reader comparison revealed significantly different growth functions, whereas almost all S. mentella reader pairs showed significant differences in growth curves. Section and break-and-burn readings of S. marinus did not differ significantly. Average ages of around 9–10 years were determined for juvenile S. mentella 24–30 cm long, which were likely to have migrated from East Greenland into the Irminger Sea, based on earlier observations. As some of the error in the age determinations presented could be attributed to interpretation differences between readers, further intercalibration of redfish ageing is urgently needed in order to provide consistent input data for stock assessment. The work was partly funded by the European Commission within the REDFISH project (QLK5-CT1999-01222). Peer reviewed |
format |
Article in Journal/Newspaper |
author |
Stransky, Christoph Gudmundsdóttir, Sif Sigurdsson, Thorsteinn Lemvig, Svend Nedreaas, Kjell Saborido-Rey, Fran |
author_facet |
Stransky, Christoph Gudmundsdóttir, Sif Sigurdsson, Thorsteinn Lemvig, Svend Nedreaas, Kjell Saborido-Rey, Fran |
author_sort |
Stransky, Christoph |
title |
Age determination and growth of Atlantic redfish (Sebastes marinus and S. mentella): bias and precision of age readers and otolith preparation methods |
title_short |
Age determination and growth of Atlantic redfish (Sebastes marinus and S. mentella): bias and precision of age readers and otolith preparation methods |
title_full |
Age determination and growth of Atlantic redfish (Sebastes marinus and S. mentella): bias and precision of age readers and otolith preparation methods |
title_fullStr |
Age determination and growth of Atlantic redfish (Sebastes marinus and S. mentella): bias and precision of age readers and otolith preparation methods |
title_full_unstemmed |
Age determination and growth of Atlantic redfish (Sebastes marinus and S. mentella): bias and precision of age readers and otolith preparation methods |
title_sort |
age determination and growth of atlantic redfish (sebastes marinus and s. mentella): bias and precision of age readers and otolith preparation methods |
publisher |
International Council for the Exploration of the Sea |
publishDate |
2005 |
url |
http://hdl.handle.net/10261/9441 https://doi.org/10.1016/j.icesjms.2005.01.018 |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Greenland Irminger Sea |
geographic_facet |
Greenland Irminger Sea |
genre |
Atlantic redfish East Greenland golden redfish Greenland North Atlantic Sebastes marinus Sebastes mentella |
genre_facet |
Atlantic redfish East Greenland golden redfish Greenland North Atlantic Sebastes marinus Sebastes mentella |
op_relation |
http://dx.doi.org/10.1016/j.icesjms.2005.01.018 ICES Journal of Marine Science 62(4): 655-670 (2005) 1054-3139 http://hdl.handle.net/10261/9441 doi:10.1016/j.icesjms.2005.01.018 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1016/j.icesjms.2005.01.018 |
container_title |
ICES Journal of Marine Science |
container_volume |
62 |
container_issue |
4 |
container_start_page |
655 |
op_container_end_page |
670 |
_version_ |
1766358358292430848 |