AGE ESTIMATION IN CALCIFIED CALCAREOUS STRUCTURES; PRELIMINARY FINDINGS OF AN INTER-LABORATORY COMPARISON
Age estimates for albacore tuna are derived using a number of methods including the enumeration of growth increments in spines, scales and otoliths. Inconsistencies in interpretation between structures and between laboratories may introduce error into the age-data available for stock assessment. A c...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.502.3809 2023-05-15T17:38:30+02:00 AGE ESTIMATION IN CALCIFIED CALCAREOUS STRUCTURES; PRELIMINARY FINDINGS OF AN INTER-LABORATORY COMPARISON Nigel Griffin Bruno Leroy Naomi Clear The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.502.3809 http://www.iccat.int/Documents/CVSP/CV062_2008/no_3/cv062030899.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.502.3809 http://www.iccat.int/Documents/CVSP/CV062_2008/no_3/cv062030899.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.iccat.int/Documents/CVSP/CV062_2008/no_3/cv062030899.pdf text ftciteseerx 2016-01-08T09:11:58Z Age estimates for albacore tuna are derived using a number of methods including the enumeration of growth increments in spines, scales and otoliths. Inconsistencies in interpretation between structures and between laboratories may introduce error into the age-data available for stock assessment. A comparative age estimation exercise was carried out to assess bias and precision of age estimates between readers and between structures. Six scientists from four laboratories, with varying levels of experience in albacore age estimation participated in the study. Images of the otoliths, scales and spines from 84 albacore tuna collected from the North east Atlantic and the Mediterranean were distributed to each reader. When the age estimates of an experienced reader were compared with those of an inexperienced reader who they had trained, moderate levels of precision were observed (mean % coefficient of variation 11.2, 7.7 and 6.5 for otoliths, scales and spines respectively). However, the wider comparison across laboratories yielded poor precision ( % coefficient of variation 35.7, 25.7 and 24.0 for otoliths, scales and spines respectively). Linear bias was detected between readers for all structures, with readers systematically over- or underestimating age relative to each other. Analysis of variance indicates that inter-reader precision is higher for Mediterranean albacore than for Atlantic albacore. Agreement of age estimates derived using different structures from the same fish was low and scales Text North East Atlantic Unknown |
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ftciteseerx |
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English |
description |
Age estimates for albacore tuna are derived using a number of methods including the enumeration of growth increments in spines, scales and otoliths. Inconsistencies in interpretation between structures and between laboratories may introduce error into the age-data available for stock assessment. A comparative age estimation exercise was carried out to assess bias and precision of age estimates between readers and between structures. Six scientists from four laboratories, with varying levels of experience in albacore age estimation participated in the study. Images of the otoliths, scales and spines from 84 albacore tuna collected from the North east Atlantic and the Mediterranean were distributed to each reader. When the age estimates of an experienced reader were compared with those of an inexperienced reader who they had trained, moderate levels of precision were observed (mean % coefficient of variation 11.2, 7.7 and 6.5 for otoliths, scales and spines respectively). However, the wider comparison across laboratories yielded poor precision ( % coefficient of variation 35.7, 25.7 and 24.0 for otoliths, scales and spines respectively). Linear bias was detected between readers for all structures, with readers systematically over- or underestimating age relative to each other. Analysis of variance indicates that inter-reader precision is higher for Mediterranean albacore than for Atlantic albacore. Agreement of age estimates derived using different structures from the same fish was low and scales |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Nigel Griffin Bruno Leroy Naomi Clear |
spellingShingle |
Nigel Griffin Bruno Leroy Naomi Clear AGE ESTIMATION IN CALCIFIED CALCAREOUS STRUCTURES; PRELIMINARY FINDINGS OF AN INTER-LABORATORY COMPARISON |
author_facet |
Nigel Griffin Bruno Leroy Naomi Clear |
author_sort |
Nigel Griffin |
title |
AGE ESTIMATION IN CALCIFIED CALCAREOUS STRUCTURES; PRELIMINARY FINDINGS OF AN INTER-LABORATORY COMPARISON |
title_short |
AGE ESTIMATION IN CALCIFIED CALCAREOUS STRUCTURES; PRELIMINARY FINDINGS OF AN INTER-LABORATORY COMPARISON |
title_full |
AGE ESTIMATION IN CALCIFIED CALCAREOUS STRUCTURES; PRELIMINARY FINDINGS OF AN INTER-LABORATORY COMPARISON |
title_fullStr |
AGE ESTIMATION IN CALCIFIED CALCAREOUS STRUCTURES; PRELIMINARY FINDINGS OF AN INTER-LABORATORY COMPARISON |
title_full_unstemmed |
AGE ESTIMATION IN CALCIFIED CALCAREOUS STRUCTURES; PRELIMINARY FINDINGS OF AN INTER-LABORATORY COMPARISON |
title_sort |
age estimation in calcified calcareous structures; preliminary findings of an inter-laboratory comparison |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.502.3809 http://www.iccat.int/Documents/CVSP/CV062_2008/no_3/cv062030899.pdf |
genre |
North East Atlantic |
genre_facet |
North East Atlantic |
op_source |
http://www.iccat.int/Documents/CVSP/CV062_2008/no_3/cv062030899.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.502.3809 http://www.iccat.int/Documents/CVSP/CV062_2008/no_3/cv062030899.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766138975863439360 |