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Tomas in mine

Tomas Naeraa

Forskare

Tomas in mine

It’s elemental, my dear watson : Validating seasonal patterns in otolith chemical chronologies

Författare

  • Karin Hüssy
  • Maria Krüger-Johnsen
  • Tonny Bernt Thomsen
  • Benjamin Dominguez Heredia
  • Tomas Næraa
  • Karin E. Limburg
  • Yvette Heimbrand
  • Kate McQueen
  • Stefanie Haase
  • Uwe Krumme
  • Michele Casini
  • Monica Mion
  • Krzysztof Radtke
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Summary, in English

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.

Avdelning/ar

  • Berggrundsgeologi

Publiceringsår

2021

Språk

Engelska

Sidor

551-566

Publikation/Tidskrift/Serie

Canadian Journal of Fisheries and Aquatic Sciences

Volym

78

Issue

5

Dokumenttyp

Artikel i tidskrift

Förlag

Canadian Science Publishing, NRC Research Press

Ämne

  • Ecology

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0706-652X