Northern Shrimp (Pandalus borealis) on Flemish Cap Surveys 2019

A stratified random bottom trawl survey on Flemish Cap was carried out from June 29thto July29th2019. The area surveyed was extended up to depths of 800 fathoms (1450meters) following the same procedures as in previous years. This year a total of 180valid hauls were made by the vessel R/V Vizconde d...

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Autor: Casas-Sánchez, José Miguel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/328789
Acceso en línea:http://hdl.handle.net/10261/328789
Access Level:acceso abierto
Palabra clave:Pesquerías
Centro Oceanográfico de Vigo
statistical sampling
Pandalus borealis
Research bottom trawl surveys
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spelling Northern Shrimp (Pandalus borealis) on Flemish Cap Surveys 2019Casas-Sánchez, José MiguelPesqueríasCentro Oceanográfico de Vigostatistical samplingPandalus borealisResearch bottom trawl surveysA stratified random bottom trawl survey on Flemish Cap was carried out from June 29thto July29th2019. The area surveyed was extended up to depths of 800 fathoms (1450meters) following the same procedures as in previous years. This year a total of 180valid hauls were made by the vessel R/V Vizconde de Ezawith the usual survey gear (Lofoten), 120up to 730 meters depth.The surveyed area has properly prospected the 32 strata planned. The general indexes for shrimp were estimated taken into account the traditional swept area (strata 1-19, up to depths of 730 m.) and the total area surveyed (strata 1-34, up to depths of 1450 m.). As the last yearsthe strata 26 and 27sited in the southeast of the bank with depths from 600 to 800 fathoms (1100-1400 m.) will not be surveyed due to the presence in the bottoms of great quantities of mud and sponges. The results concerning shrimp are presented and compared to those from previous years of the same series. The total biomass indexes have increased significantly since 2015and they are now well above Blim. The total and female biomasses estimated in 2019were 9273t and 8486t respectively.As in previous years the youngest specimens (age 1, around 10 mm CL) barely appeared in the catches and the abundance at age 2 (around 16 mm CL) was similar to the estimated in2018 at levels next to reported in2009 and 2010. However unlike 2018 the abundance at age 2 in the small mesh size bag attached on the cod-end showed a significantly increasing thatit could confirm the upward trend in the recent recruitments initiated from 2014.Also in 2019 the estimated abundance at age 1 in the juvenile bag was the second highest value in the historicalseries. If this strong year-class(2018)was confirmed in 2020 it would improve the state of impaired recruitmentand contribute to the recovery of stock. The stock after five years of continuous increases of biomass, now it hasvery low probability of being bellow Blim, allowing a small amount of direct fishing on this stock. Considering the uncertainty about the future recruitments in the fishable stock the next years, Scientific Council advises that the exploitation level for 2020 not to exceed 2009 level.EVAPESLE4Evaluación de los Stocks Explotados por las Pesquerías Lejanas Españolas en el Atlántico Norte.NONorthwest Atlantic Fisheries Organization (NAFO)202320232019info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/328789reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésCentro Oceanográfico de Vigoinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3287892026-05-22T06:33:51Z
dc.title.none.fl_str_mv Northern Shrimp (Pandalus borealis) on Flemish Cap Surveys 2019
title Northern Shrimp (Pandalus borealis) on Flemish Cap Surveys 2019
spellingShingle Northern Shrimp (Pandalus borealis) on Flemish Cap Surveys 2019
Casas-Sánchez, José Miguel
Pesquerías
Centro Oceanográfico de Vigo
statistical sampling
Pandalus borealis
Research bottom trawl surveys
title_short Northern Shrimp (Pandalus borealis) on Flemish Cap Surveys 2019
title_full Northern Shrimp (Pandalus borealis) on Flemish Cap Surveys 2019
title_fullStr Northern Shrimp (Pandalus borealis) on Flemish Cap Surveys 2019
title_full_unstemmed Northern Shrimp (Pandalus borealis) on Flemish Cap Surveys 2019
title_sort Northern Shrimp (Pandalus borealis) on Flemish Cap Surveys 2019
dc.creator.none.fl_str_mv Casas-Sánchez, José Miguel
author Casas-Sánchez, José Miguel
author_facet Casas-Sánchez, José Miguel
author_role author
dc.contributor.none.fl_str_mv Northwest Atlantic Fisheries Organization (NAFO)
dc.subject.none.fl_str_mv Pesquerías
Centro Oceanográfico de Vigo
statistical sampling
Pandalus borealis
Research bottom trawl surveys
topic Pesquerías
Centro Oceanográfico de Vigo
statistical sampling
Pandalus borealis
Research bottom trawl surveys
description A stratified random bottom trawl survey on Flemish Cap was carried out from June 29thto July29th2019. The area surveyed was extended up to depths of 800 fathoms (1450meters) following the same procedures as in previous years. This year a total of 180valid hauls were made by the vessel R/V Vizconde de Ezawith the usual survey gear (Lofoten), 120up to 730 meters depth.The surveyed area has properly prospected the 32 strata planned. The general indexes for shrimp were estimated taken into account the traditional swept area (strata 1-19, up to depths of 730 m.) and the total area surveyed (strata 1-34, up to depths of 1450 m.). As the last yearsthe strata 26 and 27sited in the southeast of the bank with depths from 600 to 800 fathoms (1100-1400 m.) will not be surveyed due to the presence in the bottoms of great quantities of mud and sponges. The results concerning shrimp are presented and compared to those from previous years of the same series. The total biomass indexes have increased significantly since 2015and they are now well above Blim. The total and female biomasses estimated in 2019were 9273t and 8486t respectively.As in previous years the youngest specimens (age 1, around 10 mm CL) barely appeared in the catches and the abundance at age 2 (around 16 mm CL) was similar to the estimated in2018 at levels next to reported in2009 and 2010. However unlike 2018 the abundance at age 2 in the small mesh size bag attached on the cod-end showed a significantly increasing thatit could confirm the upward trend in the recent recruitments initiated from 2014.Also in 2019 the estimated abundance at age 1 in the juvenile bag was the second highest value in the historicalseries. If this strong year-class(2018)was confirmed in 2020 it would improve the state of impaired recruitmentand contribute to the recovery of stock. The stock after five years of continuous increases of biomass, now it hasvery low probability of being bellow Blim, allowing a small amount of direct fishing on this stock. Considering the uncertainty about the future recruitments in the fishable stock the next years, Scientific Council advises that the exploitation level for 2020 not to exceed 2009 level.
publishDate 2019
dc.date.none.fl_str_mv 2019
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/328789
url http://hdl.handle.net/10261/328789
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Centro Oceanográfico de Vigo
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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