It’s elemental, my dear watson : Validating seasonal patterns in otolith chemical chronologies
(2021) In Canadian Journal of Fisheries and Aquatic Sciences 78(5). p.551-566- Abstract
Accurate age data are essential for reliable fish stock assessment. Yet many stocks suffer from inconsistencies in age interpretation. A new approach to obtain age makes use of the chemical composition of otoliths. This study validates the periodicity of recurrent patterns in25 Mg,31 P,34 K,55 Mn,63 Cu,64 Zn,66 Zn,85 Rb,88 Sr,138 Ba, and208 Pb in Baltic cod (Gadus morhua) otoliths from tag–recapture and known-age samples. Otolith P concentrations showed the highest consistency in seasonality over the years, with minima co-occurring with otolith winter zones in the known-age otoliths and in late winter – early spring... (More)
Accurate age data are essential for reliable fish stock assessment. Yet many stocks suffer from inconsistencies in age interpretation. A new approach to obtain age makes use of the chemical composition of otoliths. This study validates the periodicity of recurrent patterns in25 Mg,31 P,34 K,55 Mn,63 Cu,64 Zn,66 Zn,85 Rb,88 Sr,138 Ba, and208 Pb in Baltic cod (Gadus morhua) otoliths from tag–recapture and known-age samples. Otolith P concentrations showed the highest consistency in seasonality over the years, with minima co-occurring with otolith winter zones in the known-age otoliths and in late winter – early spring when water temperatures are coldest in tagged cod . The timing of minima differs between stocks, occurring around February in western Baltic cod and 1 month later in eastern Baltic cod; seasonal maxima are also stock-specific, occurring in August and October, respectively. The amplitude in P is larger in faster-growing western compared with eastern Baltic cod. Seasonal patterns with minima in winter – late spring were also evident in Mg and Mn, but less consistent over time and fish size than P. Chronological patterns in P, and to a lesser extent Mg and Mn, may have the potential to supplement traditional age estimation or to guide the visual identification of translucent and opaque otolith patterns used in traditional age estimation.
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- author
- organization
- publishing date
- 2021
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Canadian Journal of Fisheries and Aquatic Sciences
- volume
- 78
- issue
- 5
- pages
- 16 pages
- publisher
- Canadian Science Publishing, NRC Research Press
- external identifiers
-
- scopus:85105505202
- ISSN
- 0706-652X
- DOI
- 10.1139/cjfas-2020-0388
- language
- English
- LU publication?
- yes
- additional info
- Funding Information: Thanks go to all technical staff involved in the collection and processing of samples used in this study. TABACOD tagging was carried out by staff from the National Marine Fisheries Research Institute, the Technical University of Denmark, the Swedish University of Agricultural Sciences, and the Th?unen Institute of Baltic Sea Fisheries. Genotyping of TABACOD recaptures was done by Jakob Hemmer-Hansen (DTU Aqua) and otolith shape-based stock assignment by Franziska Schade (Th?unen Institute of Baltic Sea Fisheries). Additional thanks are extended to Kristian Ege Nielsen for the chemical analyses of samples. This study was funded by BalticSea2020 (http://balticsea2020.org) through the project TABACOD. Financial support is also acknowledged from the Danish Ministry for Environment and Food and the European Maritime Fisheries Fond (grant No. 33113-B-17-092), the Swedish Research Council Formas (grant No. 2015-865), and the US National Science Foundation (grant No. OCE-1923965). The authors declare there are no competing interests.
- id
- b032172c-47b4-4a33-b3c8-50963a741f91
- date added to LUP
- 2021-05-27 12:39:06
- date last changed
- 2022-04-27 02:03:32
@article{b032172c-47b4-4a33-b3c8-50963a741f91,
abstract = {{<p>Accurate age data are essential for reliable fish stock assessment. Yet many stocks suffer from inconsistencies in age interpretation. A new approach to obtain age makes use of the chemical composition of otoliths. This study validates the periodicity of recurrent patterns in<sup>25</sup> Mg,<sup>31</sup> P,<sup>34</sup> K,<sup>55</sup> Mn,<sup>63</sup> Cu,<sup>64</sup> Zn,<sup>66</sup> Zn,<sup>85</sup> Rb,<sup>88</sup> Sr,<sup>138</sup> Ba, and<sup>208</sup> Pb in Baltic cod (Gadus morhua) otoliths from tag–recapture and known-age samples. Otolith P concentrations showed the highest consistency in seasonality over the years, with minima co-occurring with otolith winter zones in the known-age otoliths and in late winter – early spring when water temperatures are coldest in tagged cod . The timing of minima differs between stocks, occurring around February in western Baltic cod and 1 month later in eastern Baltic cod; seasonal maxima are also stock-specific, occurring in August and October, respectively. The amplitude in P is larger in faster-growing western compared with eastern Baltic cod. Seasonal patterns with minima in winter – late spring were also evident in Mg and Mn, but less consistent over time and fish size than P. Chronological patterns in P, and to a lesser extent Mg and Mn, may have the potential to supplement traditional age estimation or to guide the visual identification of translucent and opaque otolith patterns used in traditional age estimation.</p>}},
author = {{Hüssy, Karin and Krüger-Johnsen, Maria and Thomsen, Tonny Bernt and Heredia, Benjamin Dominguez and Næraa, Tomas and Limburg, Karin E. and Heimbrand, Yvette and McQueen, Kate and Haase, Stefanie and Krumme, Uwe and Casini, Michele and Mion, Monica and Radtke, Krzysztof}},
issn = {{0706-652X}},
language = {{eng}},
number = {{5}},
pages = {{551--566}},
publisher = {{Canadian Science Publishing, NRC Research Press}},
series = {{Canadian Journal of Fisheries and Aquatic Sciences}},
title = {{It’s elemental, my dear watson : Validating seasonal patterns in otolith chemical chronologies}},
url = {{http://dx.doi.org/10.1139/cjfas-2020-0388}},
doi = {{10.1139/cjfas-2020-0388}},
volume = {{78}},
year = {{2021}},
}