Detailed in situ target strength measurements of 0-group cod
Target strength measurements in situ of cod fry have been made using 38 and 120 kHz split beam echo sounders. Two data sets are sampled in essentially pure, evenly sized, cod concentrations, one in a Ullsfjord, Northern Norway, and the other one in Parisvatnet, a closed 270.000 m3 saltwater basin us...
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ftimr:oai:imr.brage.unit.no:11250/105249 2023-05-15T17:43:26+02:00 Detailed in situ target strength measurements of 0-group cod Ona, Egil 1994 application/pdf http://hdl.handle.net/11250/105249 eng eng ICES ICES CM Documents;1994/B:30 This report is not to be cited without prior reference to the author http://hdl.handle.net/11250/105249 9 s. echo sounder ekkolodd stock assessment bestandsberegning cod torsk VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 Working paper 1994 ftimr 2021-09-23T20:15:31Z Target strength measurements in situ of cod fry have been made using 38 and 120 kHz split beam echo sounders. Two data sets are sampled in essentially pure, evenly sized, cod concentrations, one in a Ullsfjord, Northern Norway, and the other one in Parisvatnet, a closed 270.000 m3 saltwater basin used for production of cod fry. The average length of the two cod populations were 5.1 and 3.1 cm, respectively. The target strengths measured are significantly lower than the values obtained if extrapolating the target strength to length relation used for larger cod towards small fish. The target strength measured at 120kHz is lower than at 38 kHz. Details on measurement procedures, biology and analysis are reported. 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 |
English |
topic |
echo sounder ekkolodd stock assessment bestandsberegning cod torsk VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 |
spellingShingle |
echo sounder ekkolodd stock assessment bestandsberegning cod torsk VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 Ona, Egil Detailed in situ target strength measurements of 0-group cod |
topic_facet |
echo sounder ekkolodd stock assessment bestandsberegning cod torsk VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 |
description |
Target strength measurements in situ of cod fry have been made using 38 and 120 kHz split beam echo sounders. Two data sets are sampled in essentially pure, evenly sized, cod concentrations, one in a Ullsfjord, Northern Norway, and the other one in Parisvatnet, a closed 270.000 m3 saltwater basin used for production of cod fry. The average length of the two cod populations were 5.1 and 3.1 cm, respectively. The target strengths measured are significantly lower than the values obtained if extrapolating the target strength to length relation used for larger cod towards small fish. The target strength measured at 120kHz is lower than at 38 kHz. Details on measurement procedures, biology and analysis are reported. |
format |
Report |
author |
Ona, Egil |
author_facet |
Ona, Egil |
author_sort |
Ona, Egil |
title |
Detailed in situ target strength measurements of 0-group cod |
title_short |
Detailed in situ target strength measurements of 0-group cod |
title_full |
Detailed in situ target strength measurements of 0-group cod |
title_fullStr |
Detailed in situ target strength measurements of 0-group cod |
title_full_unstemmed |
Detailed in situ target strength measurements of 0-group cod |
title_sort |
detailed in situ target strength measurements of 0-group cod |
publisher |
ICES |
publishDate |
1994 |
url |
http://hdl.handle.net/11250/105249 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
9 s. |
op_relation |
ICES CM Documents;1994/B:30 This report is not to be cited without prior reference to the author http://hdl.handle.net/11250/105249 |
_version_ |
1766145495689854976 |