Bioenergetics of Arctic cod (Boreogadus saida) at low temperatures
The Arctic cod (Boreogadus saida), a key component of the marine food web of Canadian high Arctic waters, occurs at temperatures close to or below zero. We established a complete energy budget for this Arctic fish, based on laboratory measurements of consumption (C), growth (G), respiration (R), ege...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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1997
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Online Access: | http://dx.doi.org/10.1139/f97-086 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-086 |
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crcansciencepubl:10.1139/f97-086 2024-06-23T07:48:56+00:00 Bioenergetics of Arctic cod (Boreogadus saida) at low temperatures Hop, H Tonn, W M Welch, H E 1997 http://dx.doi.org/10.1139/f97-086 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-086 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 54, issue 8, page 1772-1784 ISSN 0706-652X 1205-7533 journal-article 1997 crcansciencepubl https://doi.org/10.1139/f97-086 2024-06-06T04:11:15Z The Arctic cod (Boreogadus saida), a key component of the marine food web of Canadian high Arctic waters, occurs at temperatures close to or below zero. We established a complete energy budget for this Arctic fish, based on laboratory measurements of consumption (C), growth (G), respiration (R), egestion (F), and excretion (U) at about 0°C. An average (N = 3) energy budget for individual juvenile Arctic cod fed live Arctic zooplankton was 100C = 50G + 24R + 9SDA + 3F + 6U + 8Z, where SDA is specific dynamic action (derived from previously published studies) and Z included activity and unaccounted energy. Eight determinations of total energy budgets for fish fed to satiation accounted for 72-104% of the energy consumed. Maximum daily rations and growth rates were dependent on fish size and the energy content of prey. Although maximum daily rations were similar for small fish fed different prey, diets of Calanus copepods (high energy content) resulted in faster growth rates than diets of Themisto amphipods or capelin (Mallotus villosus) fillets. Both consumption and respiration rates were low at temperatures close to 0°C. The net result was slow growth rates, although the assimilation efficiency was about 80%. Because of slow growth of individuals, the relatively high annual production of Arctic cod mainly reflects their large standing biomass. Article in Journal/Newspaper Arctic cod Arctic Boreogadus saida Themisto Zooplankton Copepods Canadian Science Publishing Arctic Canadian Journal of Fisheries and Aquatic Sciences 54 8 1772 1784 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
The Arctic cod (Boreogadus saida), a key component of the marine food web of Canadian high Arctic waters, occurs at temperatures close to or below zero. We established a complete energy budget for this Arctic fish, based on laboratory measurements of consumption (C), growth (G), respiration (R), egestion (F), and excretion (U) at about 0°C. An average (N = 3) energy budget for individual juvenile Arctic cod fed live Arctic zooplankton was 100C = 50G + 24R + 9SDA + 3F + 6U + 8Z, where SDA is specific dynamic action (derived from previously published studies) and Z included activity and unaccounted energy. Eight determinations of total energy budgets for fish fed to satiation accounted for 72-104% of the energy consumed. Maximum daily rations and growth rates were dependent on fish size and the energy content of prey. Although maximum daily rations were similar for small fish fed different prey, diets of Calanus copepods (high energy content) resulted in faster growth rates than diets of Themisto amphipods or capelin (Mallotus villosus) fillets. Both consumption and respiration rates were low at temperatures close to 0°C. The net result was slow growth rates, although the assimilation efficiency was about 80%. Because of slow growth of individuals, the relatively high annual production of Arctic cod mainly reflects their large standing biomass. |
format |
Article in Journal/Newspaper |
author |
Hop, H Tonn, W M Welch, H E |
spellingShingle |
Hop, H Tonn, W M Welch, H E Bioenergetics of Arctic cod (Boreogadus saida) at low temperatures |
author_facet |
Hop, H Tonn, W M Welch, H E |
author_sort |
Hop, H |
title |
Bioenergetics of Arctic cod (Boreogadus saida) at low temperatures |
title_short |
Bioenergetics of Arctic cod (Boreogadus saida) at low temperatures |
title_full |
Bioenergetics of Arctic cod (Boreogadus saida) at low temperatures |
title_fullStr |
Bioenergetics of Arctic cod (Boreogadus saida) at low temperatures |
title_full_unstemmed |
Bioenergetics of Arctic cod (Boreogadus saida) at low temperatures |
title_sort |
bioenergetics of arctic cod (boreogadus saida) at low temperatures |
publisher |
Canadian Science Publishing |
publishDate |
1997 |
url |
http://dx.doi.org/10.1139/f97-086 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-086 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic cod Arctic Boreogadus saida Themisto Zooplankton Copepods |
genre_facet |
Arctic cod Arctic Boreogadus saida Themisto Zooplankton Copepods |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 54, issue 8, page 1772-1784 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f97-086 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
54 |
container_issue |
8 |
container_start_page |
1772 |
op_container_end_page |
1784 |
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1802639244027494400 |