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
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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Format: | Article in Journal/Newspaper |
Language: | English |
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Oxford Journals
2014
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Online Access: | http://hdl.handle.net/11250/194930 https://doi.org/10.1093/icesjms/fsu030 |
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ftimr:oai:imr.brage.unit.no:11250/194930 2023-05-15T14:27:25+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 Kjesbu, Olav Sigurd Opdal, Anders Frugård Korsbrekke, Knut Devine, Jennifer A. Skjæraasen, Jon Egil 2014-03-11 application/pdf http://hdl.handle.net/11250/194930 https://doi.org/10.1093/icesjms/fsu030 eng eng Oxford Journals Kjesbu, O.S., Opdal, A.F., Korsbrekke, K., Devine, J.A., Skjæraasen, J.E., 2014. 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. ICES Journal of Marine Science: Journal du Conseil. DOI:10.1093/icesjms/fsu030 urn:issn:1095-9289 urn:issn:1054-3139 http://hdl.handle.net/11250/194930 https://doi.org/10.1093/icesjms/fsu030 11 p. ICES Journal of Marine Science VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 Journal article Peer reviewed 2014 ftimr https://doi.org/10.1093/icesjms/fsu030 2021-09-23T20:15:22Z 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. Article in Journal/Newspaper Arctic Arctic cod Arctic Gadus morhua Lofoten North Atlantic North Atlantic oscillation Northeast Arctic cod Northern Norway Institute for Marine Research: Brage IMR Arctic Lofoten Norway ICES Journal of Marine Science 71 8 2053 2063 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 |
spellingShingle |
VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 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 |
topic_facet |
VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 |
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 |
Article in Journal/Newspaper |
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 |
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 |
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 |
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 |
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 |
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 |
publisher |
Oxford Journals |
publishDate |
2014 |
url |
http://hdl.handle.net/11250/194930 https://doi.org/10.1093/icesjms/fsu030 |
geographic |
Arctic Lofoten Norway |
geographic_facet |
Arctic Lofoten Norway |
genre |
Arctic Arctic cod Arctic Gadus morhua Lofoten North Atlantic North Atlantic oscillation Northeast Arctic cod Northern Norway |
genre_facet |
Arctic Arctic cod Arctic Gadus morhua Lofoten North Atlantic North Atlantic oscillation Northeast Arctic cod Northern Norway |
op_source |
11 p. ICES Journal of Marine Science |
op_relation |
Kjesbu, O.S., Opdal, A.F., Korsbrekke, K., Devine, J.A., Skjæraasen, J.E., 2014. 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. ICES Journal of Marine Science: Journal du Conseil. DOI:10.1093/icesjms/fsu030 urn:issn:1095-9289 urn:issn:1054-3139 http://hdl.handle.net/11250/194930 https://doi.org/10.1093/icesjms/fsu030 |
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_ |
1766301134888108032 |