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...
Main Authors: | , , |
---|---|
Format: | Report |
Language: | English |
Published: |
2001
|
Subjects: | |
Online Access: | http://hdl.handle.net/10508/1573 http://hdl.handle.net/10261/329111 |
id |
ftcsic:oai:digital.csic.es:10261/329111 |
---|---|
record_format |
openpolar |
spelling |
ftcsic:oai:digital.csic.es:10261/329111 2024-02-11T10:06:25+01:00 A Preliminary Investigation of the Efficiency of Canadian and Spanish Survey Bottom Trawls on the Southern Grand Bank Walsh, Stephen Paz, Xabier Durán-Muñoz, Pablo Atlantic Ocean North Atlantic Northwest Atlantic 2001-06 http://hdl.handle.net/10508/1573 http://hdl.handle.net/10261/329111 en eng Centro Oceanográfico de Vigo 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. http://hdl.handle.net/10508/1573 http://hdl.handle.net/10261/329111 open Pesquerías Centro Oceanográfico de Vigo working paper 2001 ftcsic 2024-01-16T11:49:38Z 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 Digital.CSIC (Spanish National Research Council) Canada |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Pesquerías Centro Oceanográfico de Vigo |
spellingShingle |
Pesquerías Centro Oceanográfico de Vigo Walsh, Stephen Paz, Xabier Durán-Muñoz, Pablo A Preliminary Investigation of the Efficiency of Canadian and Spanish Survey Bottom Trawls on the Southern Grand Bank |
topic_facet |
Pesquerías Centro Oceanográfico de Vigo |
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, Stephen Paz, Xabier Durán-Muñoz, Pablo |
author_facet |
Walsh, Stephen Paz, Xabier Durán-Muñoz, Pablo |
author_sort |
Walsh, 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 |
publishDate |
2001 |
url |
http://hdl.handle.net/10508/1573 http://hdl.handle.net/10261/329111 |
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 |
Centro Oceanográfico de Vigo 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. http://hdl.handle.net/10508/1573 http://hdl.handle.net/10261/329111 |
op_rights |
open |
_version_ |
1790604126528208896 |