Escapement of gadoid fish beneath a commercial bottom trawl : relevence to the overall trawl selectivity
This is a preprint of an article submitted for consideration in Fisheries Research, Copyright 2006, Elsevier. Fisheries Research is available at http://www.sciencedirect.com/science/journal/01657836 Escapement of Atlantic cod (Gadus morhua), haddock (Melanogrammus aegle nus) and saithe (Pollachius v...
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ftunivbergen:oai:bora.uib.no:1956/1191 2023-05-15T15:27:36+02:00 Escapement of gadoid fish beneath a commercial bottom trawl : relevence to the overall trawl selectivity Ingólfsson, Ólafur Arnar Jørgensen, Terje 2006 1592790 bytes application/pdf http://hdl.handle.net/1956/1191 eng eng Elsevier Fisheries Research urn:issn:0165-7836 http://hdl.handle.net/1956/1191 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 Peer reviewed Journal article 2006 ftunivbergen 2023-03-14T17:42:40Z This is a preprint of an article submitted for consideration in Fisheries Research, Copyright 2006, Elsevier. Fisheries Research is available at http://www.sciencedirect.com/science/journal/01657836 Escapement of Atlantic cod (Gadus morhua), haddock (Melanogrammus aegle nus) and saithe (Pollachius virens) beneath a commercial bottom trawl, rigged with a 60 cm diameter rockhopper gear, was studied in the Barents Sea. The study was performed off the coast of north Norway in March/April 2003. In order to collect the escapees, three sampling bags were attached behind the rockhopper gear. Approximately one third of the cod and a quarter of the haddock available to the trawl escaped. Cod escape rates were highly length dependent, following a sigmoid curve with an estimated length at 50% escape of 38.5 cm and interquartile width of 34.1 cm. Length dependence was less pronounced in haddock. The escape rate of saithe was not length dependent, and on average seven percent passed under the trawl's shing line. Fish abundance had no observable effects on escape rates. Both video observations and scale abrasions on the fi sh caught in the collecting bags showed that some of the escaped fish had been overrun by the gear. Article in Journal/Newspaper atlantic cod Barents Sea Gadus morhua North Norway University of Bergen: Bergen Open Research Archive (BORA-UiB) Barents Sea Norway |
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Open Polar |
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University of Bergen: Bergen Open Research Archive (BORA-UiB) |
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ftunivbergen |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 |
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VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 Ingólfsson, Ólafur Arnar Jørgensen, Terje Escapement of gadoid fish beneath a commercial bottom trawl : relevence to the overall trawl selectivity |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 |
description |
This is a preprint of an article submitted for consideration in Fisheries Research, Copyright 2006, Elsevier. Fisheries Research is available at http://www.sciencedirect.com/science/journal/01657836 Escapement of Atlantic cod (Gadus morhua), haddock (Melanogrammus aegle nus) and saithe (Pollachius virens) beneath a commercial bottom trawl, rigged with a 60 cm diameter rockhopper gear, was studied in the Barents Sea. The study was performed off the coast of north Norway in March/April 2003. In order to collect the escapees, three sampling bags were attached behind the rockhopper gear. Approximately one third of the cod and a quarter of the haddock available to the trawl escaped. Cod escape rates were highly length dependent, following a sigmoid curve with an estimated length at 50% escape of 38.5 cm and interquartile width of 34.1 cm. Length dependence was less pronounced in haddock. The escape rate of saithe was not length dependent, and on average seven percent passed under the trawl's shing line. Fish abundance had no observable effects on escape rates. Both video observations and scale abrasions on the fi sh caught in the collecting bags showed that some of the escaped fish had been overrun by the gear. |
format |
Article in Journal/Newspaper |
author |
Ingólfsson, Ólafur Arnar Jørgensen, Terje |
author_facet |
Ingólfsson, Ólafur Arnar Jørgensen, Terje |
author_sort |
Ingólfsson, Ólafur Arnar |
title |
Escapement of gadoid fish beneath a commercial bottom trawl : relevence to the overall trawl selectivity |
title_short |
Escapement of gadoid fish beneath a commercial bottom trawl : relevence to the overall trawl selectivity |
title_full |
Escapement of gadoid fish beneath a commercial bottom trawl : relevence to the overall trawl selectivity |
title_fullStr |
Escapement of gadoid fish beneath a commercial bottom trawl : relevence to the overall trawl selectivity |
title_full_unstemmed |
Escapement of gadoid fish beneath a commercial bottom trawl : relevence to the overall trawl selectivity |
title_sort |
escapement of gadoid fish beneath a commercial bottom trawl : relevence to the overall trawl selectivity |
publisher |
Elsevier |
publishDate |
2006 |
url |
http://hdl.handle.net/1956/1191 |
geographic |
Barents Sea Norway |
geographic_facet |
Barents Sea Norway |
genre |
atlantic cod Barents Sea Gadus morhua North Norway |
genre_facet |
atlantic cod Barents Sea Gadus morhua North Norway |
op_relation |
Fisheries Research urn:issn:0165-7836 http://hdl.handle.net/1956/1191 |
_version_ |
1766358012864233472 |