Making use of Johan Hjort's "unknown" legacy: reconstruction of a 150-year coastal time-series on northeast Arctic cod (Gadus morhua) liver data reveals long-term trends in energy allocation patterns
Hidden within the seminal 1914 publication by Johan Hjort, we find what is probably one of the first comprehensive teleost time-series ever published. The series is liver size and fat content of northeast Arctic (NEA) cod measured during the traditional winter fishery in Lofoten, Northern Norway, in...
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fthighwire:oai:open-archive.highwire.org:icesjms:71/8/2053 2023-05-15T14:30:30+02:00 Making use of Johan Hjort's "unknown" legacy: reconstruction of a 150-year coastal time-series on northeast Arctic cod (Gadus morhua) liver data reveals long-term trends in energy allocation patterns Kjesbu, Olav Sigurd Opdal, Anders Frugård Korsbrekke, Knut Devine, Jennifer A. Skjæraasen, Jon Egil 2014-10-01 00:00:00.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/71/8/2053 https://doi.org/10.1093/icesjms/fsu030 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/71/8/2053 http://dx.doi.org/10.1093/icesjms/fsu030 Copyright (C) 2014, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Where we are TEXT 2014 fthighwire https://doi.org/10.1093/icesjms/fsu030 2015-02-28T22:22:56Z Hidden within the seminal 1914 publication by Johan Hjort, we find what is probably one of the first comprehensive teleost time-series ever published. The series is liver size and fat content of northeast Arctic (NEA) cod measured during the traditional winter fishery in Lofoten, Northern Norway, in 1880–1912 and 1883–1913, respectively. The data were collected well before the advent of the great industrialized fisheries in the 1930s. The raw data used by Hjort originate from annual reports of the Lofoten fishery, initiated by Member of Parliament and pioneer fishery inspector of Northern Norway, Ketil Motzfeldt, in 1859. Based on these reports and following various calibration exercises, we present robust estimates of the hepatosomatic index (HSI) from 1859 to 2012 (except 1863), i.e. over 153 years—extending Hjort's analysis both backwards (1859–1879) and forwards (1913–present). This series of bulk HSI contained five major periods: 1859–1880, 1881–1919, 1920–1974, 1975–2003, and 2004–2012; the highest HSI was recorded 1920–1974, whereas the lowest was from the most recent period. Despite variability, total length was a significant predictor of HSI, 1932–2012. A weak but significant relationship existed with both total-stock biomass and ocean temperature, as well as with the North Atlantic Oscillation winter index under a 1-year lag. The present exceptionally long HSI series will give an excellent opportunity for further research on the “quality of the cod” in a historic perspective. Text Arctic cod Arctic Gadus morhua Lofoten North Atlantic North Atlantic oscillation Northeast Arctic cod Northern Norway HighWire Press (Stanford University) Arctic Lofoten Norway ICES Journal of Marine Science 71 8 2053 2063 |
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HighWire Press (Stanford University) |
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English |
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Where we are |
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Where we are Kjesbu, Olav Sigurd Opdal, Anders Frugård Korsbrekke, Knut Devine, Jennifer A. Skjæraasen, Jon Egil Making use of Johan Hjort's "unknown" legacy: reconstruction of a 150-year coastal time-series on northeast Arctic cod (Gadus morhua) liver data reveals long-term trends in energy allocation patterns |
topic_facet |
Where we are |
description |
Hidden within the seminal 1914 publication by Johan Hjort, we find what is probably one of the first comprehensive teleost time-series ever published. The series is liver size and fat content of northeast Arctic (NEA) cod measured during the traditional winter fishery in Lofoten, Northern Norway, in 1880–1912 and 1883–1913, respectively. The data were collected well before the advent of the great industrialized fisheries in the 1930s. The raw data used by Hjort originate from annual reports of the Lofoten fishery, initiated by Member of Parliament and pioneer fishery inspector of Northern Norway, Ketil Motzfeldt, in 1859. Based on these reports and following various calibration exercises, we present robust estimates of the hepatosomatic index (HSI) from 1859 to 2012 (except 1863), i.e. over 153 years—extending Hjort's analysis both backwards (1859–1879) and forwards (1913–present). This series of bulk HSI contained five major periods: 1859–1880, 1881–1919, 1920–1974, 1975–2003, and 2004–2012; the highest HSI was recorded 1920–1974, whereas the lowest was from the most recent period. Despite variability, total length was a significant predictor of HSI, 1932–2012. A weak but significant relationship existed with both total-stock biomass and ocean temperature, as well as with the North Atlantic Oscillation winter index under a 1-year lag. The present exceptionally long HSI series will give an excellent opportunity for further research on the “quality of the cod” in a historic perspective. |
format |
Text |
author |
Kjesbu, Olav Sigurd Opdal, Anders Frugård Korsbrekke, Knut Devine, Jennifer A. Skjæraasen, Jon Egil |
author_facet |
Kjesbu, Olav Sigurd Opdal, Anders Frugård Korsbrekke, Knut Devine, Jennifer A. Skjæraasen, Jon Egil |
author_sort |
Kjesbu, Olav Sigurd |
title |
Making use of Johan Hjort's "unknown" legacy: reconstruction of a 150-year coastal time-series on northeast Arctic cod (Gadus morhua) liver data reveals long-term trends in energy allocation patterns |
title_short |
Making use of Johan Hjort's "unknown" legacy: reconstruction of a 150-year coastal time-series on northeast Arctic cod (Gadus morhua) liver data reveals long-term trends in energy allocation patterns |
title_full |
Making use of Johan Hjort's "unknown" legacy: reconstruction of a 150-year coastal time-series on northeast Arctic cod (Gadus morhua) liver data reveals long-term trends in energy allocation patterns |
title_fullStr |
Making use of Johan Hjort's "unknown" legacy: reconstruction of a 150-year coastal time-series on northeast Arctic cod (Gadus morhua) liver data reveals long-term trends in energy allocation patterns |
title_full_unstemmed |
Making use of Johan Hjort's "unknown" legacy: reconstruction of a 150-year coastal time-series on northeast Arctic cod (Gadus morhua) liver data reveals long-term trends in energy allocation patterns |
title_sort |
making use of johan hjort's "unknown" legacy: reconstruction of a 150-year coastal time-series on northeast arctic cod (gadus morhua) liver data reveals long-term trends in energy allocation patterns |
publisher |
Oxford University Press |
publishDate |
2014 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/71/8/2053 https://doi.org/10.1093/icesjms/fsu030 |
geographic |
Arctic Lofoten Norway |
geographic_facet |
Arctic Lofoten Norway |
genre |
Arctic cod Arctic Gadus morhua Lofoten North Atlantic North Atlantic oscillation Northeast Arctic cod Northern Norway |
genre_facet |
Arctic cod Arctic Gadus morhua Lofoten North Atlantic North Atlantic oscillation Northeast Arctic cod Northern Norway |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/71/8/2053 http://dx.doi.org/10.1093/icesjms/fsu030 |
op_rights |
Copyright (C) 2014, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1093/icesjms/fsu030 |
container_title |
ICES Journal of Marine Science |
container_volume |
71 |
container_issue |
8 |
container_start_page |
2053 |
op_container_end_page |
2063 |
_version_ |
1766304337791811584 |