Fish communities on the slop of the eastern Norwegian Sea
Bortom trawl data from the depth interval 300-2050 m on the slope off Norway were analysed to study distribution of fish biomass and the associated species assemblages. It is hypothesised that the pronounced hydrographic front between the warm Atlantic Waterrnass and the cold Norwegian Sea Deep-wate...
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ftimr:oai:imr.brage.unit.no:11250/105861 2023-05-15T14:59:16+02:00 Fish communities on the slop of the eastern Norwegian Sea Bergstad, Odd Aksel Bjelland, Otte Gordon, John D.M. 1998 application/pdf http://hdl.handle.net/11250/105861 eng eng ICES ICES CM Documents;1998/O:30 This report is not to be cited without prior reference to the authors http://hdl.handle.net/11250/105861 29 s. Norwegian Sea Norskehavet distribution utbredelse biomass biomasse VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 Working paper 1998 ftimr 2021-09-23T20:15:31Z Bortom trawl data from the depth interval 300-2050 m on the slope off Norway were analysed to study distribution of fish biomass and the associated species assemblages. It is hypothesised that the pronounced hydrographic front between the warm Atlantic Waterrnass and the cold Norwegian Sea Deep-water, combined with a declining food supply with depth and distance from the shelf, structure the assemblages on the continental slope of the eastem Nmwegian Sea. From a high level at the shelf edge and upper slope, the fish biomass declined abruptly at about 720 m when crossing the 0"C-isotherm associated with the hydrographic front. Beneath the frontal zone, the fish biornass was only 11% of that above it and decreased further with increasing depth. In upper slope waters, the fish biornass increased with increasing latitude. Arctic species such as Lycodes frigidus and Paraliparis bathybius were dominant in the deep cold slope waters. The high fish biomass associated with the steep temperature gradient at 600-720 m was rnainly attributable to a few large and/or abundant boreo-arctic species, i.e. Greenland halibut Reinhardtius hippoglossoides, redfishes Sebastes mentella and S. marinus, roughhead grenadier Macrourus berglax, and Raja hyperborea. In the shallower and warrner upper slope waters a species assemblage occurred which resembled that associated with adjacent deep shelf areas strongly influenced by the Atlantic Watermass. Report Arctic Greenland Norskehav* Norwegian Sea Sebastes mentella Institute for Marine Research: Brage IMR Arctic Norwegian Sea Greenland Norway |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
Norwegian Sea Norskehavet distribution utbredelse biomass biomasse VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 |
spellingShingle |
Norwegian Sea Norskehavet distribution utbredelse biomass biomasse VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 Bergstad, Odd Aksel Bjelland, Otte Gordon, John D.M. Fish communities on the slop of the eastern Norwegian Sea |
topic_facet |
Norwegian Sea Norskehavet distribution utbredelse biomass biomasse VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 |
description |
Bortom trawl data from the depth interval 300-2050 m on the slope off Norway were analysed to study distribution of fish biomass and the associated species assemblages. It is hypothesised that the pronounced hydrographic front between the warm Atlantic Waterrnass and the cold Norwegian Sea Deep-water, combined with a declining food supply with depth and distance from the shelf, structure the assemblages on the continental slope of the eastem Nmwegian Sea. From a high level at the shelf edge and upper slope, the fish biomass declined abruptly at about 720 m when crossing the 0"C-isotherm associated with the hydrographic front. Beneath the frontal zone, the fish biornass was only 11% of that above it and decreased further with increasing depth. In upper slope waters, the fish biornass increased with increasing latitude. Arctic species such as Lycodes frigidus and Paraliparis bathybius were dominant in the deep cold slope waters. The high fish biomass associated with the steep temperature gradient at 600-720 m was rnainly attributable to a few large and/or abundant boreo-arctic species, i.e. Greenland halibut Reinhardtius hippoglossoides, redfishes Sebastes mentella and S. marinus, roughhead grenadier Macrourus berglax, and Raja hyperborea. In the shallower and warrner upper slope waters a species assemblage occurred which resembled that associated with adjacent deep shelf areas strongly influenced by the Atlantic Watermass. |
format |
Report |
author |
Bergstad, Odd Aksel Bjelland, Otte Gordon, John D.M. |
author_facet |
Bergstad, Odd Aksel Bjelland, Otte Gordon, John D.M. |
author_sort |
Bergstad, Odd Aksel |
title |
Fish communities on the slop of the eastern Norwegian Sea |
title_short |
Fish communities on the slop of the eastern Norwegian Sea |
title_full |
Fish communities on the slop of the eastern Norwegian Sea |
title_fullStr |
Fish communities on the slop of the eastern Norwegian Sea |
title_full_unstemmed |
Fish communities on the slop of the eastern Norwegian Sea |
title_sort |
fish communities on the slop of the eastern norwegian sea |
publisher |
ICES |
publishDate |
1998 |
url |
http://hdl.handle.net/11250/105861 |
geographic |
Arctic Norwegian Sea Greenland Norway |
geographic_facet |
Arctic Norwegian Sea Greenland Norway |
genre |
Arctic Greenland Norskehav* Norwegian Sea Sebastes mentella |
genre_facet |
Arctic Greenland Norskehav* Norwegian Sea Sebastes mentella |
op_source |
29 s. |
op_relation |
ICES CM Documents;1998/O:30 This report is not to be cited without prior reference to the authors http://hdl.handle.net/11250/105861 |
_version_ |
1766331378551488512 |