Otolith microstructure analysis to resolve seasonal patterns of hatching and settlement in western Baltic cod

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Otolith microstructure analysis to resolve seasonal patterns of hatching and settlement in western Baltic cod. / Rehberg-Haas, Sabine; Hammer, Cornelius; Hillgruber, Nicola; Hüssy, Karin; Temming, Axel.

In: I C E S Journal of Marine Science, Vol. 69, No. 8, 2012, p. 1347-1356.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Author

Rehberg-Haas, Sabine; Hammer, Cornelius; Hillgruber, Nicola; Hüssy, Karin; Temming, Axel / Otolith microstructure analysis to resolve seasonal patterns of hatching and settlement in western Baltic cod.

In: I C E S Journal of Marine Science, Vol. 69, No. 8, 2012, p. 1347-1356.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

Bibtex

@article{236a6b20bc6b4c9bbc322750074e509a,
title = "Otolith microstructure analysis to resolve seasonal patterns of hatching and settlement in western Baltic cod",
keywords = "annulus, Baltic cod, daily increment analysis, Gadus morhua, settlement check",
publisher = "Oxford University Press",
author = "Sabine Rehberg-Haas and Cornelius Hammer and Nicola Hillgruber and Karin Hüssy and Axel Temming",
year = "2012",
doi = "10.1093/icesjms/fss112",
volume = "69",
number = "8",
pages = "1347--1356",
journal = "I C E S Journal of Marine Science",
issn = "1054-3139",

}

RIS

TY - JOUR

T1 - Otolith microstructure analysis to resolve seasonal patterns of hatching and settlement in western Baltic cod

A1 - Rehberg-Haas,Sabine

A1 - Hammer,Cornelius

A1 - Hillgruber,Nicola

A1 - Hüssy,Karin

A1 - Temming,Axel

AU - Rehberg-Haas,Sabine

AU - Hammer,Cornelius

AU - Hillgruber,Nicola

AU - Hüssy,Karin

AU - Temming,Axel

PB - Oxford University Press

PY - 2012

Y1 - 2012

N2 - Previous studies showed that Baltic cod (Gadus morhua) settle to demersal life at a given size, while the annulus is formed seasonally, irrespective of size. The goal of this study was to examine the timing of check formation in juvenile Baltic cod otoliths to validate macrostructural ageing and to differentiate between true annuli and secondary structures such as settlement checks. Otoliths were collected from fish off Fehmarn Island in 2008 and 2009, and were examined for macrostructural and microstructural patterns using light and scanning electron microscopy. All fish examined were age-0. Back-calculation of hatch dates indicated hatching from April to June and from February to August in 2008 and 2009, respectively. Juveniles formed either one or two translucent rings. The first translucent ring started to form ∼3 months post-hatch and was interpreted as a settlement check, since it appeared to be a function of age and/or size and not season. Deposition of the second ring began in mid October to early November irrespective of fish size and/or age, thus indicating that this ring may represent the first annulus of Baltic cod. Both rings were clearly distinguishable in individuals hatched between February and May, but were merged in those fish where settlement coincided with the seasonally formed second ring

AB - Previous studies showed that Baltic cod (Gadus morhua) settle to demersal life at a given size, while the annulus is formed seasonally, irrespective of size. The goal of this study was to examine the timing of check formation in juvenile Baltic cod otoliths to validate macrostructural ageing and to differentiate between true annuli and secondary structures such as settlement checks. Otoliths were collected from fish off Fehmarn Island in 2008 and 2009, and were examined for macrostructural and microstructural patterns using light and scanning electron microscopy. All fish examined were age-0. Back-calculation of hatch dates indicated hatching from April to June and from February to August in 2008 and 2009, respectively. Juveniles formed either one or two translucent rings. The first translucent ring started to form ∼3 months post-hatch and was interpreted as a settlement check, since it appeared to be a function of age and/or size and not season. Deposition of the second ring began in mid October to early November irrespective of fish size and/or age, thus indicating that this ring may represent the first annulus of Baltic cod. Both rings were clearly distinguishable in individuals hatched between February and May, but were merged in those fish where settlement coincided with the seasonally formed second ring

KW - annulus

KW - Baltic cod

KW - daily increment analysis

KW - Gadus morhua

KW - settlement check

U2 - 10.1093/icesjms/fss112

DO - 10.1093/icesjms/fss112

JO - I C E S Journal of Marine Science

JF - I C E S Journal of Marine Science

SN - 1054-3139

IS - 8

VL - 69

SP - 1347

EP - 1356

ER -