Effect in survey indices of removing stations in the NAFO closed Areas in the design of the EU surveys including the 2021 closed areas
In 2009, the Fisheries Commission established several coral and sponges protection closures areas to bottom fisheries within the NAFO Regulatory Area that started to be applied in 2010. Three random bottom trawl surveys are performed by the EU yearly in the NAFO Regulatory Area: Spanish Div. 3NO (Sp...
Main Authors: | , , |
---|---|
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2022
|
Subjects: | |
Online Access: | http://hdl.handle.net/10508/15970 http://hdl.handle.net/10261/327335 |
id |
ftcsic:oai:digital.csic.es:10261/327335 |
---|---|
record_format |
openpolar |
spelling |
ftcsic:oai:digital.csic.es:10261/327335 2024-02-11T10:04:23+01:00 Effect in survey indices of removing stations in the NAFO closed Areas in the design of the EU surveys including the 2021 closed areas González-Troncoso, Diana Garrido, Irene González-Costas, Fernando NAFO Halifax Océan atlantique Atlantique Nord Atlantic Ocean Atlántico Norte NAFO Océano Atlántico North Atlantic 1988-2021 2022-06-16 http://hdl.handle.net/10508/15970 http://hdl.handle.net/10261/327335 en eng Centro Oceanográfico de Vigo VoR https://www.nafo.int/Portals/0/PDFs/sc/2022/scr22-032REV.pdf NAFO Scientific Council Research (SCR) Documents, NAFO SCR Doc. 22/032REV. 2022: 1-150 http://hdl.handle.net/10508/15970 http://hdl.handle.net/10261/327335 50287 open NAFO Pesquerías Centro Oceanográfico de Vigo Flemish Cap Grand Banks of Newfoundland Scientific survey VME Closed Areas fish sponges spring surveys biomass artículo http://purl.org/coar/resource_type/c_6501 2022 ftcsic 2024-01-16T11:48:56Z In 2009, the Fisheries Commission established several coral and sponges protection closures areas to bottom fisheries within the NAFO Regulatory Area that started to be applied in 2010. Three random bottom trawl surveys are performed by the EU yearly in the NAFO Regulatory Area: Spanish Div. 3NO (Spring), Spanish and Portuguese in Div. 3M (Summer) and Spanish Div. 3L (Summer). The surveys are currently carried out by the R/V Vizconde de Eza and covers the closed areas. A study of the survey indices of the species assessed in NAFO (except shrimp) have been performed to know the impact of removing the hauls in the closed areas from the survey. The results of the analysis show that there are two species, Greenland halibut and roughhead grenadier, in which their biomass and/or age/length indices are affected in all the surveys analyzed. This is due to the fact that these two species are distributed at greater depths and that the closed areas are mainly found in deep areas, so the suppression of survey hauls in closed areas has a greater impact on the indices of these two species. The best way to know the impact in the assessment results of these changes in the Greenland halibut and roughhead grenadier indices would be to run the assessment with both indices, the base case ones and the new case ones, and compare the results. There are other species in which their global biomass indices do not change very much, but their age or length indices change appreciably when hauls from closed areas are removed from the calculations. In one case, the results of the assessment are compromised and it would be better to rerun the assessment with the new case indices to see the differences. In other cases, although the length distribution is not directly used in the assessment models, some recruitment and spawning stock biomass indices are derived from them, so changes in the perception of the stock could be encountered. These changes in the age/length indices should be considered in future assessments of these stocks if the ... Article in Journal/Newspaper Greenland Newfoundland North Atlantic Digital.CSIC (Spanish National Research Council) Greenland |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
NAFO Pesquerías Centro Oceanográfico de Vigo Flemish Cap Grand Banks of Newfoundland Scientific survey VME Closed Areas fish sponges spring surveys biomass |
spellingShingle |
NAFO Pesquerías Centro Oceanográfico de Vigo Flemish Cap Grand Banks of Newfoundland Scientific survey VME Closed Areas fish sponges spring surveys biomass González-Troncoso, Diana Garrido, Irene González-Costas, Fernando Effect in survey indices of removing stations in the NAFO closed Areas in the design of the EU surveys including the 2021 closed areas |
topic_facet |
NAFO Pesquerías Centro Oceanográfico de Vigo Flemish Cap Grand Banks of Newfoundland Scientific survey VME Closed Areas fish sponges spring surveys biomass |
description |
In 2009, the Fisheries Commission established several coral and sponges protection closures areas to bottom fisheries within the NAFO Regulatory Area that started to be applied in 2010. Three random bottom trawl surveys are performed by the EU yearly in the NAFO Regulatory Area: Spanish Div. 3NO (Spring), Spanish and Portuguese in Div. 3M (Summer) and Spanish Div. 3L (Summer). The surveys are currently carried out by the R/V Vizconde de Eza and covers the closed areas. A study of the survey indices of the species assessed in NAFO (except shrimp) have been performed to know the impact of removing the hauls in the closed areas from the survey. The results of the analysis show that there are two species, Greenland halibut and roughhead grenadier, in which their biomass and/or age/length indices are affected in all the surveys analyzed. This is due to the fact that these two species are distributed at greater depths and that the closed areas are mainly found in deep areas, so the suppression of survey hauls in closed areas has a greater impact on the indices of these two species. The best way to know the impact in the assessment results of these changes in the Greenland halibut and roughhead grenadier indices would be to run the assessment with both indices, the base case ones and the new case ones, and compare the results. There are other species in which their global biomass indices do not change very much, but their age or length indices change appreciably when hauls from closed areas are removed from the calculations. In one case, the results of the assessment are compromised and it would be better to rerun the assessment with the new case indices to see the differences. In other cases, although the length distribution is not directly used in the assessment models, some recruitment and spawning stock biomass indices are derived from them, so changes in the perception of the stock could be encountered. These changes in the age/length indices should be considered in future assessments of these stocks if the ... |
author2 |
NAFO |
format |
Article in Journal/Newspaper |
author |
González-Troncoso, Diana Garrido, Irene González-Costas, Fernando |
author_facet |
González-Troncoso, Diana Garrido, Irene González-Costas, Fernando |
author_sort |
González-Troncoso, Diana |
title |
Effect in survey indices of removing stations in the NAFO closed Areas in the design of the EU surveys including the 2021 closed areas |
title_short |
Effect in survey indices of removing stations in the NAFO closed Areas in the design of the EU surveys including the 2021 closed areas |
title_full |
Effect in survey indices of removing stations in the NAFO closed Areas in the design of the EU surveys including the 2021 closed areas |
title_fullStr |
Effect in survey indices of removing stations in the NAFO closed Areas in the design of the EU surveys including the 2021 closed areas |
title_full_unstemmed |
Effect in survey indices of removing stations in the NAFO closed Areas in the design of the EU surveys including the 2021 closed areas |
title_sort |
effect in survey indices of removing stations in the nafo closed areas in the design of the eu surveys including the 2021 closed areas |
publishDate |
2022 |
url |
http://hdl.handle.net/10508/15970 http://hdl.handle.net/10261/327335 |
op_coverage |
Halifax Océan atlantique Atlantique Nord Atlantic Ocean Atlántico Norte NAFO Océano Atlántico North Atlantic 1988-2021 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Newfoundland North Atlantic |
genre_facet |
Greenland Newfoundland North Atlantic |
op_relation |
Centro Oceanográfico de Vigo VoR https://www.nafo.int/Portals/0/PDFs/sc/2022/scr22-032REV.pdf NAFO Scientific Council Research (SCR) Documents, NAFO SCR Doc. 22/032REV. 2022: 1-150 http://hdl.handle.net/10508/15970 http://hdl.handle.net/10261/327335 50287 |
op_rights |
open |
_version_ |
1790600976813522944 |