A Preliminary Investigation of the Efficiency of Canadian and Spanish Survey Bottom Trawls on the Southern Grand Bank
Preliminary analysis of the capture efficiency of the bottom trawls used by Canada and Spain in surveys of the Grand Bank was conducted using a variant of the logistic model to analyse a series of comparative fishing data. Within the Canadian comparative data of the old and new survey trawls, the ne...
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Centro Oceanográfico de Vigo
2001
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ftieo:oai:repositorio.ieo.es:10508/1573 2023-05-15T17:32:44+02:00 A Preliminary Investigation of the Efficiency of Canadian and Spanish Survey Bottom Trawls on the Southern Grand Bank Walsh, S.J. (Stephen) Paz, X. (Xabier) Durán-Muñoz, P. (Pablo) Atlantic Ocean North Atlantic Northwest Atlantic 2001-06 http://hdl.handle.net/10508/1573 eng eng Centro Oceanográfico de Vigo http://hdl.handle.net/10508/1573 Walsh, Stephen J. et al. 2001. A Preliminary Investigation of the Efficiency of Canadian and Spanish Survey Bottom Trawls on the Southern Grand Bank. NAFO Sci. Coun. Res. Doc. 01/74, Serial Nº N4453: 18p. Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess CC-BY-NC-ND workingPaper 2001 ftieo 2022-07-26T23:47:03Z Preliminary analysis of the capture efficiency of the bottom trawls used by Canada and Spain in surveys of the Grand Bank was conducted using a variant of the logistic model to analyse a series of comparative fishing data. Within the Canadian comparative data of the old and new survey trawls, the new survey trawl was less efficient for larger cod and yellowtail flounder but not so for American plaice. However, there is some uncertainty in capture probability for larger fish because of a sparse catches in the data. The Spanish survey trawl is more efficient than the new Canadian survey trawl because of the use of longer sweep lines, which increase catchability in plaice and yellowtail flounder. The logistic model did not fit the data well, in particular for yellowtail flounder. Further analysis is suggested which may offer more insight into modelling and interpretation of the capture efficiency of these survey trawls. Report North Atlantic Northwest Atlantic Instituto Español de Oceanografía: e-IEO Canada |
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Open Polar |
collection |
Instituto Español de Oceanografía: e-IEO |
op_collection_id |
ftieo |
language |
English |
description |
Preliminary analysis of the capture efficiency of the bottom trawls used by Canada and Spain in surveys of the Grand Bank was conducted using a variant of the logistic model to analyse a series of comparative fishing data. Within the Canadian comparative data of the old and new survey trawls, the new survey trawl was less efficient for larger cod and yellowtail flounder but not so for American plaice. However, there is some uncertainty in capture probability for larger fish because of a sparse catches in the data. The Spanish survey trawl is more efficient than the new Canadian survey trawl because of the use of longer sweep lines, which increase catchability in plaice and yellowtail flounder. The logistic model did not fit the data well, in particular for yellowtail flounder. Further analysis is suggested which may offer more insight into modelling and interpretation of the capture efficiency of these survey trawls. |
format |
Report |
author |
Walsh, S.J. (Stephen) Paz, X. (Xabier) Durán-Muñoz, P. (Pablo) |
spellingShingle |
Walsh, S.J. (Stephen) Paz, X. (Xabier) Durán-Muñoz, P. (Pablo) A Preliminary Investigation of the Efficiency of Canadian and Spanish Survey Bottom Trawls on the Southern Grand Bank |
author_facet |
Walsh, S.J. (Stephen) Paz, X. (Xabier) Durán-Muñoz, P. (Pablo) |
author_sort |
Walsh, S.J. (Stephen) |
title |
A Preliminary Investigation of the Efficiency of Canadian and Spanish Survey Bottom Trawls on the Southern Grand Bank |
title_short |
A Preliminary Investigation of the Efficiency of Canadian and Spanish Survey Bottom Trawls on the Southern Grand Bank |
title_full |
A Preliminary Investigation of the Efficiency of Canadian and Spanish Survey Bottom Trawls on the Southern Grand Bank |
title_fullStr |
A Preliminary Investigation of the Efficiency of Canadian and Spanish Survey Bottom Trawls on the Southern Grand Bank |
title_full_unstemmed |
A Preliminary Investigation of the Efficiency of Canadian and Spanish Survey Bottom Trawls on the Southern Grand Bank |
title_sort |
preliminary investigation of the efficiency of canadian and spanish survey bottom trawls on the southern grand bank |
publisher |
Centro Oceanográfico de Vigo |
publishDate |
2001 |
url |
http://hdl.handle.net/10508/1573 |
op_coverage |
Atlantic Ocean North Atlantic Northwest Atlantic |
geographic |
Canada |
geographic_facet |
Canada |
genre |
North Atlantic Northwest Atlantic |
genre_facet |
North Atlantic Northwest Atlantic |
op_relation |
http://hdl.handle.net/10508/1573 Walsh, Stephen J. et al. 2001. A Preliminary Investigation of the Efficiency of Canadian and Spanish Survey Bottom Trawls on the Southern Grand Bank. NAFO Sci. Coun. Res. Doc. 01/74, Serial Nº N4453: 18p. |
op_rights |
Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766130981003067392 |