The relationship between seal abundance and cod worm (Phocanema decipiens) infestation in cod in Norwegian coastal waters
A sample of 52 cods, Gadus morhua, caught close to a grey seal, Halichoerus grypus, haul out site, and a total of 652 cods from 18 commercial catches (average sample size 36 cods) were examined with regard to cod worm infestation. The sampling was carried out from July 1978 to January 1981 in Norweg...
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ftimr:oai:imr.brage.unit.no:11250/104068 2024-09-15T18:07:20+00:00 The relationship between seal abundance and cod worm (Phocanema decipiens) infestation in cod in Norwegian coastal waters Bjørge, Arne 1985 application/pdf http://hdl.handle.net/11250/104068 eng eng ICES ICES CM Documents;1985/N:4 This report is not to be cited without prior reference to the author http://hdl.handle.net/11250/104068 8 s. seal sel fish diseases fiskesykdommer cod torsk VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 Working paper 1985 ftimr 2024-07-31T03:37:25Z A sample of 52 cods, Gadus morhua, caught close to a grey seal, Halichoerus grypus, haul out site, and a total of 652 cods from 18 commercial catches (average sample size 36 cods) were examined with regard to cod worm infestation. The sampling was carried out from July 1978 to January 1981 in Norwegian coastal waters between 62° and 66° North. The presence of larval cod worm was recorded in 64% of the examined fishes, and the average infestation in all 704 fishes was 8.5 cod-worms per fish. However, the infestation decreased significantly with increasing distances from the haul out sites of grey seals and common seals, Phoca vitulina. The heaviest infestations were recorded in cod from the outern part of in shore waters, and slightly decreasing towards the fjords, fitting well to the observed distribution of seals. A substantial decrease was also recorded with increasing distance (and depth) off shore from the mentioned grey seal haul out site. Report Gadus morhua Phoca vitulina Institute for Marine Research: Brage IMR |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
seal sel fish diseases fiskesykdommer cod torsk VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 |
spellingShingle |
seal sel fish diseases fiskesykdommer cod torsk VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 Bjørge, Arne The relationship between seal abundance and cod worm (Phocanema decipiens) infestation in cod in Norwegian coastal waters |
topic_facet |
seal sel fish diseases fiskesykdommer cod torsk VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 |
description |
A sample of 52 cods, Gadus morhua, caught close to a grey seal, Halichoerus grypus, haul out site, and a total of 652 cods from 18 commercial catches (average sample size 36 cods) were examined with regard to cod worm infestation. The sampling was carried out from July 1978 to January 1981 in Norwegian coastal waters between 62° and 66° North. The presence of larval cod worm was recorded in 64% of the examined fishes, and the average infestation in all 704 fishes was 8.5 cod-worms per fish. However, the infestation decreased significantly with increasing distances from the haul out sites of grey seals and common seals, Phoca vitulina. The heaviest infestations were recorded in cod from the outern part of in shore waters, and slightly decreasing towards the fjords, fitting well to the observed distribution of seals. A substantial decrease was also recorded with increasing distance (and depth) off shore from the mentioned grey seal haul out site. |
format |
Report |
author |
Bjørge, Arne |
author_facet |
Bjørge, Arne |
author_sort |
Bjørge, Arne |
title |
The relationship between seal abundance and cod worm (Phocanema decipiens) infestation in cod in Norwegian coastal waters |
title_short |
The relationship between seal abundance and cod worm (Phocanema decipiens) infestation in cod in Norwegian coastal waters |
title_full |
The relationship between seal abundance and cod worm (Phocanema decipiens) infestation in cod in Norwegian coastal waters |
title_fullStr |
The relationship between seal abundance and cod worm (Phocanema decipiens) infestation in cod in Norwegian coastal waters |
title_full_unstemmed |
The relationship between seal abundance and cod worm (Phocanema decipiens) infestation in cod in Norwegian coastal waters |
title_sort |
relationship between seal abundance and cod worm (phocanema decipiens) infestation in cod in norwegian coastal waters |
publisher |
ICES |
publishDate |
1985 |
url |
http://hdl.handle.net/11250/104068 |
genre |
Gadus morhua Phoca vitulina |
genre_facet |
Gadus morhua Phoca vitulina |
op_source |
8 s. |
op_relation |
ICES CM Documents;1985/N:4 This report is not to be cited without prior reference to the author http://hdl.handle.net/11250/104068 |
_version_ |
1810444707156721664 |