Diurnal variation in frequency response of gadoids in the Barents Sea ...
No abstracts are to be cited without prior reference to the author.Earlier studies have demonstrated substantial diurnal variation in acoustic abundance of fish. Both the level and the uncertainty of abundance estimates from surveys carried out around the clock are affected. It has been hypothesized...
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ASC 2006 - Theme session I
2024
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ftdatacite:10.17895/ices.pub.25258786.v1 2024-03-31T07:51:54+00:00 Diurnal variation in frequency response of gadoids in the Barents Sea ... Godø, Olav Rune Hjellvik, Vidar Tjøstheim, Dag 2024 https://dx.doi.org/10.17895/ices.pub.25258786.v1 https://ices-library.figshare.com/articles/conference_contribution/Diurnal_variation_in_frequency_response_of_gadoids_in_the_Barents_Sea/25258786/1 unknown ASC 2006 - Theme session I https://ices-library.figshare.com/ICES-ASC-2006/groups https://dx.doi.org/10.17895/ices.pub.25258786 https://ices-library.figshare.com/ICES-ASC-2006/groups ICES Custom Licence https://www.ices.dk/Pages/library_policies.aspx Fisheries and aquaculture Technologies and data Conference contribution article CreativeWork Other 2024 ftdatacite https://doi.org/10.17895/ices.pub.25258786.v110.17895/ices.pub.25258786 2024-03-04T14:11:39Z No abstracts are to be cited without prior reference to the author.Earlier studies have demonstrated substantial diurnal variation in acoustic abundance of fish. Both the level and the uncertainty of abundance estimates from surveys carried out around the clock are affected. It has been hypothesized that diurnal variation in acoustic densities is caused by a diurnal variation in tilt angle. As the directivity of fish is higher at higher frequencies a diurnal variation in tilt angle will affect the acoustic recordings more for higher than for lower frequencies. This hypothesis is tested through an analysis of the frequency response of acoustic recordings of cod and haddock in the Barents Sea from 18, 38, 70 and 120 kHz Simrad EK 60 echo sounders. The results demonstrate, as expected, a systematic diurnal change where the reduction in acoustic densities during nighttime is more prominent for higher frequencies. The result is expected since gadoids are visual feeders being active with a more directed swimming ... Conference Object Barents Sea DataCite Metadata Store (German National Library of Science and Technology) Barents Sea |
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DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
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unknown |
topic |
Fisheries and aquaculture Technologies and data |
spellingShingle |
Fisheries and aquaculture Technologies and data Godø, Olav Rune Hjellvik, Vidar Tjøstheim, Dag Diurnal variation in frequency response of gadoids in the Barents Sea ... |
topic_facet |
Fisheries and aquaculture Technologies and data |
description |
No abstracts are to be cited without prior reference to the author.Earlier studies have demonstrated substantial diurnal variation in acoustic abundance of fish. Both the level and the uncertainty of abundance estimates from surveys carried out around the clock are affected. It has been hypothesized that diurnal variation in acoustic densities is caused by a diurnal variation in tilt angle. As the directivity of fish is higher at higher frequencies a diurnal variation in tilt angle will affect the acoustic recordings more for higher than for lower frequencies. This hypothesis is tested through an analysis of the frequency response of acoustic recordings of cod and haddock in the Barents Sea from 18, 38, 70 and 120 kHz Simrad EK 60 echo sounders. The results demonstrate, as expected, a systematic diurnal change where the reduction in acoustic densities during nighttime is more prominent for higher frequencies. The result is expected since gadoids are visual feeders being active with a more directed swimming ... |
format |
Conference Object |
author |
Godø, Olav Rune Hjellvik, Vidar Tjøstheim, Dag |
author_facet |
Godø, Olav Rune Hjellvik, Vidar Tjøstheim, Dag |
author_sort |
Godø, Olav Rune |
title |
Diurnal variation in frequency response of gadoids in the Barents Sea ... |
title_short |
Diurnal variation in frequency response of gadoids in the Barents Sea ... |
title_full |
Diurnal variation in frequency response of gadoids in the Barents Sea ... |
title_fullStr |
Diurnal variation in frequency response of gadoids in the Barents Sea ... |
title_full_unstemmed |
Diurnal variation in frequency response of gadoids in the Barents Sea ... |
title_sort |
diurnal variation in frequency response of gadoids in the barents sea ... |
publisher |
ASC 2006 - Theme session I |
publishDate |
2024 |
url |
https://dx.doi.org/10.17895/ices.pub.25258786.v1 https://ices-library.figshare.com/articles/conference_contribution/Diurnal_variation_in_frequency_response_of_gadoids_in_the_Barents_Sea/25258786/1 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_relation |
https://ices-library.figshare.com/ICES-ASC-2006/groups https://dx.doi.org/10.17895/ices.pub.25258786 https://ices-library.figshare.com/ICES-ASC-2006/groups |
op_rights |
ICES Custom Licence https://www.ices.dk/Pages/library_policies.aspx |
op_doi |
https://doi.org/10.17895/ices.pub.25258786.v110.17895/ices.pub.25258786 |
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1795030724069294080 |