Improving the age reading of East Greenland Atlantic cod ( Gadus morhua) by determining otolith growth zone timing and annuli widths

Abstract Accurate and consistent age readings are cornerstones of age‐based assessment and management of exploited fish stocks. Otoliths are the preferred structure for age determination, often performed by counting the number of completed 001 zones. Uncertainty regarding the identification of the f...

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Published in:Fisheries Management and Ecology
Main Authors: Lyngby, Mette Svantemann, Rigét, Frank, Retzel, Anja, Hedeholm, Rasmus, Grønkjær, Peter
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2020
Subjects:
Online Access:http://dx.doi.org/10.1111/fme.12442
https://onlinelibrary.wiley.com/doi/pdf/10.1111/fme.12442
https://onlinelibrary.wiley.com/doi/full-xml/10.1111/fme.12442
id crwiley:10.1111/fme.12442
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spelling crwiley:10.1111/fme.12442 2024-06-02T08:03:07+00:00 Improving the age reading of East Greenland Atlantic cod ( Gadus morhua) by determining otolith growth zone timing and annuli widths Lyngby, Mette Svantemann Rigét, Frank Retzel, Anja Hedeholm, Rasmus Grønkjær, Peter 2020 http://dx.doi.org/10.1111/fme.12442 https://onlinelibrary.wiley.com/doi/pdf/10.1111/fme.12442 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/fme.12442 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Fisheries Management and Ecology volume 27, issue 6, page 628-632 ISSN 0969-997X 1365-2400 journal-article 2020 crwiley https://doi.org/10.1111/fme.12442 2024-05-03T11:33:41Z Abstract Accurate and consistent age readings are cornerstones of age‐based assessment and management of exploited fish stocks. Otoliths are the preferred structure for age determination, often performed by counting the number of completed 001 zones. Uncertainty regarding the identification of the first translucent zone and the timing of translucent zone formation can cause skewed age determination even in species with otherwise clearly defined annuli. This study addresses an inter‐institutional discrepancy in age readings of the East Greenland Atlantic cod Gadus morhua L. By analysing the opacity of the otolith margin of cod sampled monthly from February to December, it was shown that translucent zones are formed primarily during March–May. Size distributions of the dorsal–ventral and proximal–distal widths of the first three translucent zones are provided as guide to their identification. This study provides new knowledge that resolves the discrepancy in age reading of East Greenland Atlantic cod. Article in Journal/Newspaper atlantic cod East Greenland Gadus morhua Greenland Wiley Online Library Greenland Fisheries Management and Ecology 27 6 628 632
institution Open Polar
collection Wiley Online Library
op_collection_id crwiley
language English
description Abstract Accurate and consistent age readings are cornerstones of age‐based assessment and management of exploited fish stocks. Otoliths are the preferred structure for age determination, often performed by counting the number of completed 001 zones. Uncertainty regarding the identification of the first translucent zone and the timing of translucent zone formation can cause skewed age determination even in species with otherwise clearly defined annuli. This study addresses an inter‐institutional discrepancy in age readings of the East Greenland Atlantic cod Gadus morhua L. By analysing the opacity of the otolith margin of cod sampled monthly from February to December, it was shown that translucent zones are formed primarily during March–May. Size distributions of the dorsal–ventral and proximal–distal widths of the first three translucent zones are provided as guide to their identification. This study provides new knowledge that resolves the discrepancy in age reading of East Greenland Atlantic cod.
format Article in Journal/Newspaper
author Lyngby, Mette Svantemann
Rigét, Frank
Retzel, Anja
Hedeholm, Rasmus
Grønkjær, Peter
spellingShingle Lyngby, Mette Svantemann
Rigét, Frank
Retzel, Anja
Hedeholm, Rasmus
Grønkjær, Peter
Improving the age reading of East Greenland Atlantic cod ( Gadus morhua) by determining otolith growth zone timing and annuli widths
author_facet Lyngby, Mette Svantemann
Rigét, Frank
Retzel, Anja
Hedeholm, Rasmus
Grønkjær, Peter
author_sort Lyngby, Mette Svantemann
title Improving the age reading of East Greenland Atlantic cod ( Gadus morhua) by determining otolith growth zone timing and annuli widths
title_short Improving the age reading of East Greenland Atlantic cod ( Gadus morhua) by determining otolith growth zone timing and annuli widths
title_full Improving the age reading of East Greenland Atlantic cod ( Gadus morhua) by determining otolith growth zone timing and annuli widths
title_fullStr Improving the age reading of East Greenland Atlantic cod ( Gadus morhua) by determining otolith growth zone timing and annuli widths
title_full_unstemmed Improving the age reading of East Greenland Atlantic cod ( Gadus morhua) by determining otolith growth zone timing and annuli widths
title_sort improving the age reading of east greenland atlantic cod ( gadus morhua) by determining otolith growth zone timing and annuli widths
publisher Wiley
publishDate 2020
url http://dx.doi.org/10.1111/fme.12442
https://onlinelibrary.wiley.com/doi/pdf/10.1111/fme.12442
https://onlinelibrary.wiley.com/doi/full-xml/10.1111/fme.12442
geographic Greenland
geographic_facet Greenland
genre atlantic cod
East Greenland
Gadus morhua
Greenland
genre_facet atlantic cod
East Greenland
Gadus morhua
Greenland
op_source Fisheries Management and Ecology
volume 27, issue 6, page 628-632
ISSN 0969-997X 1365-2400
op_rights http://onlinelibrary.wiley.com/termsAndConditions#vor
op_doi https://doi.org/10.1111/fme.12442
container_title Fisheries Management and Ecology
container_volume 27
container_issue 6
container_start_page 628
op_container_end_page 632
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