Angular distribution of overwintering Norwegian spring spawning herring
Fish Capture Committee When plankton production drops off in the fall, adult Norwegian spring spawning herring migrate to two fiords in northern Norway with stable water masses with low temperature and predation. In the wintering areas, the herring occupy deeper water. Thus, without the ability to r...
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Language: | Norwegian Bokmål |
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Online Access: | http://hdl.handle.net/11250/100319 |
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ftimr:oai:imr.brage.unit.no:11250/100319 2023-05-15T17:43:23+02:00 Angular distribution of overwintering Norwegian spring spawning herring Huse, Ingvar Foote, Kenneth G. Ona, Egil Røttingen, Ingolf 1994 968382 bytes application/pdf http://hdl.handle.net/11250/100319 nob nob ICES ICES CM documents 1994/B:19 http://hdl.handle.net/11250/100319 14 s. VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 Working paper 1994 ftimr 2021-09-23T20:14:47Z Fish Capture Committee When plankton production drops off in the fall, adult Norwegian spring spawning herring migrate to two fiords in northern Norway with stable water masses with low temperature and predation. In the wintering areas, the herring occupy deeper water. Thus, without the ability to refill the swim bladder, they are constantly underflotated. This leads to different adaptive behaviour day and night, which is reflected in swimming angle. As the swimming angle is very important for the directivity of acoustic backscattering, this behaviour could have substantial impact on acoustic measurement of fish density. Results from extensive photographic observations are discussed in this respect. Report Northern Norway Institute for Marine Research: Brage IMR Norway |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
Norwegian Bokmål |
topic |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 |
spellingShingle |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 Huse, Ingvar Foote, Kenneth G. Ona, Egil Røttingen, Ingolf Angular distribution of overwintering Norwegian spring spawning herring |
topic_facet |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 |
description |
Fish Capture Committee When plankton production drops off in the fall, adult Norwegian spring spawning herring migrate to two fiords in northern Norway with stable water masses with low temperature and predation. In the wintering areas, the herring occupy deeper water. Thus, without the ability to refill the swim bladder, they are constantly underflotated. This leads to different adaptive behaviour day and night, which is reflected in swimming angle. As the swimming angle is very important for the directivity of acoustic backscattering, this behaviour could have substantial impact on acoustic measurement of fish density. Results from extensive photographic observations are discussed in this respect. |
format |
Report |
author |
Huse, Ingvar Foote, Kenneth G. Ona, Egil Røttingen, Ingolf |
author_facet |
Huse, Ingvar Foote, Kenneth G. Ona, Egil Røttingen, Ingolf |
author_sort |
Huse, Ingvar |
title |
Angular distribution of overwintering Norwegian spring spawning herring |
title_short |
Angular distribution of overwintering Norwegian spring spawning herring |
title_full |
Angular distribution of overwintering Norwegian spring spawning herring |
title_fullStr |
Angular distribution of overwintering Norwegian spring spawning herring |
title_full_unstemmed |
Angular distribution of overwintering Norwegian spring spawning herring |
title_sort |
angular distribution of overwintering norwegian spring spawning herring |
publisher |
ICES |
publishDate |
1994 |
url |
http://hdl.handle.net/11250/100319 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
14 s. |
op_relation |
ICES CM documents 1994/B:19 http://hdl.handle.net/11250/100319 |
_version_ |
1766145442685386752 |