A comparison between two sonic measuring systems for demersal fish
Two sonic methods for estimation of abundance of fish stocks, the echo integrator and the digital counter methods, were compared on single and schooling fish in the Lofoten area of Norway during March 1969. Good correlation was obtained between the two systems for both situations, but the slopes of...
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Fisheries Research Board of Canada
1970
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Online Access: | http://hdl.handle.net/11250/108120 |
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ftimr:oai:imr.brage.unit.no:11250/108120 2023-05-15T17:08:15+02:00 A comparison between two sonic measuring systems for demersal fish Dowd, R. G. Bakken, Erling Nakken, Odd 1970 221613 bytes application/pdf http://hdl.handle.net/11250/108120 eng eng Fisheries Research Board of Canada urn:issn:0015-296x http://hdl.handle.net/11250/108120 737-742 27 Journal of the Fisheries Research Board of Canada 1 Peer reviewed Journal article 1970 ftimr 2021-09-23T20:14:32Z Two sonic methods for estimation of abundance of fish stocks, the echo integrator and the digital counter methods, were compared on single and schooling fish in the Lofoten area of Norway during March 1969. Good correlation was obtained between the two systems for both situations, but the slopes of the regressions of integrated values on the digital counter differed significantly between low and high density fish concentrations. This suggests that the two systems treated the echo information differently, but nevertheless maintained a linear relation between themselves over a wide range of counts. Article in Journal/Newspaper Lofoten Institute for Marine Research: Brage IMR Lofoten Norway |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
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ftimr |
language |
English |
description |
Two sonic methods for estimation of abundance of fish stocks, the echo integrator and the digital counter methods, were compared on single and schooling fish in the Lofoten area of Norway during March 1969. Good correlation was obtained between the two systems for both situations, but the slopes of the regressions of integrated values on the digital counter differed significantly between low and high density fish concentrations. This suggests that the two systems treated the echo information differently, but nevertheless maintained a linear relation between themselves over a wide range of counts. |
format |
Article in Journal/Newspaper |
author |
Dowd, R. G. Bakken, Erling Nakken, Odd |
spellingShingle |
Dowd, R. G. Bakken, Erling Nakken, Odd A comparison between two sonic measuring systems for demersal fish |
author_facet |
Dowd, R. G. Bakken, Erling Nakken, Odd |
author_sort |
Dowd, R. G. |
title |
A comparison between two sonic measuring systems for demersal fish |
title_short |
A comparison between two sonic measuring systems for demersal fish |
title_full |
A comparison between two sonic measuring systems for demersal fish |
title_fullStr |
A comparison between two sonic measuring systems for demersal fish |
title_full_unstemmed |
A comparison between two sonic measuring systems for demersal fish |
title_sort |
comparison between two sonic measuring systems for demersal fish |
publisher |
Fisheries Research Board of Canada |
publishDate |
1970 |
url |
http://hdl.handle.net/11250/108120 |
geographic |
Lofoten Norway |
geographic_facet |
Lofoten Norway |
genre |
Lofoten |
genre_facet |
Lofoten |
op_source |
737-742 27 Journal of the Fisheries Research Board of Canada 1 |
op_relation |
urn:issn:0015-296x http://hdl.handle.net/11250/108120 |
_version_ |
1766063971921559552 |