A sonar study of the migration pattern of Norwegian spring-spawning herring (Clupea harengus L.) in July
About 700 schools of Norwegian spring-spawning herring (Clupea harengus L.) were tracked by multi-beam sonar during transect surveys in the Norwegian Sea in July 1995 and 1996. This herring stock usually concentrates in the area west of Lofoten in July-August after its feeding migration in the Norwe...
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ftimr:oai:imr.brage.unit.no:11250/100465 2024-09-15T18:17:55+00:00 A sonar study of the migration pattern of Norwegian spring-spawning herring (Clupea harengus L.) in July Kvamme, Cecilie Nøttestad, Leif Fernö, Anders Misund, Ole Arve Dommasnes, Are Axelsen, Bjørn Erik 2000 239197 bytes application/pdf http://hdl.handle.net/11250/100465 eng eng ICES ICES CM documents 2000/K:14 This report is not to be quoted without prior consultation with the General Secretary. http://hdl.handle.net/11250/100465 24 s. herring sild sonar fish migration vandringer VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 Working paper 2000 ftimr 2024-07-31T03:37:25Z About 700 schools of Norwegian spring-spawning herring (Clupea harengus L.) were tracked by multi-beam sonar during transect surveys in the Norwegian Sea in July 1995 and 1996. This herring stock usually concentrates in the area west of Lofoten in July-August after its feeding migration in the Norwegian Sea, and the herring were thus expected to swim eastwards towards the coast in July. The survey area was divided into three sub-areas based on distance from the main wintering area in Vestfjorden, habitat and the age of herring. In 1995 a total of 502 schools were classified as migrating, stationary or avoiding, of which 31 % were migrating, 61 % stationary and 8 % avoiding schools. The schools were located shallow (0-60 m) during day and night, suggesting that they were feeding. A high proportion of feeding schools, with high dynamic tendencies, may thus explain the prevalence of stationary schools. Migrating schools had a mean migration speed of 0.66 m s-1, and migrated westwards in coastal areas. Stomach samples from trawl and high acoustic densities of plankton near the continental slope suggested that feeding conditions were better here than in coastal areas, and the schools probably left coastal areas because of sub-optimal feeding conditions. Herring probably track their prey by a flexible combination of predictive (genetic, learning) and reactive orientation mechanisms. By migrating westwards the herring may have improved their feeding conditions, thus extending their feeding season. Report Lofoten Norwegian Sea Vestfjorden Institute for Marine Research: Brage IMR |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
herring sild sonar fish migration vandringer VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 |
spellingShingle |
herring sild sonar fish migration vandringer VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 Kvamme, Cecilie Nøttestad, Leif Fernö, Anders Misund, Ole Arve Dommasnes, Are Axelsen, Bjørn Erik A sonar study of the migration pattern of Norwegian spring-spawning herring (Clupea harengus L.) in July |
topic_facet |
herring sild sonar fish migration vandringer VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 |
description |
About 700 schools of Norwegian spring-spawning herring (Clupea harengus L.) were tracked by multi-beam sonar during transect surveys in the Norwegian Sea in July 1995 and 1996. This herring stock usually concentrates in the area west of Lofoten in July-August after its feeding migration in the Norwegian Sea, and the herring were thus expected to swim eastwards towards the coast in July. The survey area was divided into three sub-areas based on distance from the main wintering area in Vestfjorden, habitat and the age of herring. In 1995 a total of 502 schools were classified as migrating, stationary or avoiding, of which 31 % were migrating, 61 % stationary and 8 % avoiding schools. The schools were located shallow (0-60 m) during day and night, suggesting that they were feeding. A high proportion of feeding schools, with high dynamic tendencies, may thus explain the prevalence of stationary schools. Migrating schools had a mean migration speed of 0.66 m s-1, and migrated westwards in coastal areas. Stomach samples from trawl and high acoustic densities of plankton near the continental slope suggested that feeding conditions were better here than in coastal areas, and the schools probably left coastal areas because of sub-optimal feeding conditions. Herring probably track their prey by a flexible combination of predictive (genetic, learning) and reactive orientation mechanisms. By migrating westwards the herring may have improved their feeding conditions, thus extending their feeding season. |
format |
Report |
author |
Kvamme, Cecilie Nøttestad, Leif Fernö, Anders Misund, Ole Arve Dommasnes, Are Axelsen, Bjørn Erik |
author_facet |
Kvamme, Cecilie Nøttestad, Leif Fernö, Anders Misund, Ole Arve Dommasnes, Are Axelsen, Bjørn Erik |
author_sort |
Kvamme, Cecilie |
title |
A sonar study of the migration pattern of Norwegian spring-spawning herring (Clupea harengus L.) in July |
title_short |
A sonar study of the migration pattern of Norwegian spring-spawning herring (Clupea harengus L.) in July |
title_full |
A sonar study of the migration pattern of Norwegian spring-spawning herring (Clupea harengus L.) in July |
title_fullStr |
A sonar study of the migration pattern of Norwegian spring-spawning herring (Clupea harengus L.) in July |
title_full_unstemmed |
A sonar study of the migration pattern of Norwegian spring-spawning herring (Clupea harengus L.) in July |
title_sort |
sonar study of the migration pattern of norwegian spring-spawning herring (clupea harengus l.) in july |
publisher |
ICES |
publishDate |
2000 |
url |
http://hdl.handle.net/11250/100465 |
genre |
Lofoten Norwegian Sea Vestfjorden |
genre_facet |
Lofoten Norwegian Sea Vestfjorden |
op_source |
24 s. |
op_relation |
ICES CM documents 2000/K:14 This report is not to be quoted without prior consultation with the General Secretary. http://hdl.handle.net/11250/100465 |
_version_ |
1810456043479629824 |