Acoustic assessment and distribution of the main pelagic fish species in ICES Subdivision 9a South during the ECOCADIZ-RECLUTAS 2021-10 Spanish survey (October 2021).
The present working document summarises the main results obtained from the ECOCADIZ-RECLUTAS 2021-10 Spanish (pelagic ecosystem-) acoustic-trawl survey conducted by IEO between 21st October and 07th November 2021 in the Portuguese and Spanish shelf waters (20-200 m isobaths) off the Gulf of Cadiz (G...
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ftcsic:oai:digital.csic.es:10261/324526 2024-02-11T10:06:50+01:00 Acoustic assessment and distribution of the main pelagic fish species in ICES Subdivision 9a South during the ECOCADIZ-RECLUTAS 2021-10 Spanish survey (October 2021). Ramos, Fernando Córdoba-Sellés, María del Pilar Tornero, Jorge Sánchez-Barba, María José Navarro, María Rosario On-line (WebEx) Océan atlantique Atlantique Nord Atlantic Ocean Eastern Central Atlantic ICES Atlántico Centro-oriental Atlantique centre-est Gulf of Cadiz Golfo de Cádiz Atlantique central Atlántico Central Atlántico Norte Océano Atlántico Central Atlantic North Atlantic 2021 2022-05 http://hdl.handle.net/10508/16184 http://hdl.handle.net/10261/324526 en eng Centro Oceanográfico de Cádiz ICES Working Group Southern horse mackerel, Anchovy and Sardine (WGHANSA-1) 2022. (23/05/2022 - 27/05/2022. On-line (WebEx)). 2022. http://hdl.handle.net/10508/16184 http://hdl.handle.net/10261/324526 50473 open Gulf of Cadiz Centro Oceanográfico de Cádiz Pesquerías Acoustic-trawl surveys Pelagic fish resources Spatial distribution Recruitment pelagic fish distribution species Acoustic data working paper 2022 ftcsic 2024-01-16T11:47:33Z The present working document summarises the main results obtained from the ECOCADIZ-RECLUTAS 2021-10 Spanish (pelagic ecosystem-) acoustic-trawl survey conducted by IEO between 21st October and 07th November 2021 in the Portuguese and Spanish shelf waters (20-200 m isobaths) off the Gulf of Cadiz (GoC) onboard the R/V Ramón Margalef. The survey suffered a ten-day delay in relation to the usual starting dates. The survey’s main objective is the acoustic assessment of anchovy and sardine juveniles (age 0 fish) in the GoC recruitment areas. The 21 foreseen acoustic transects were sampled. A total of 18 valid fishing hauls were carried out for echo-trace ground-truthing purposes. Chub mackerel, anchovy and sardine were the most frequent captured species in the fishing hauls, followed by horse mackerel, bogue, Atlantic mackerel, Mediterranean horse mackerel and blue jack mackerel. Boarfish, longspine snipefish and pearlside showed an incidental occurrence in the hauls performed in the surveyed area. Sardine and chub mackerel showed the highest yields in these hauls, followed by anchovy and Mediterranean horse mackerel. Total and Spanish estimates of total NASC allocated to the “pelagic fish species assemblage” in this survey showed lower values than those recorded last year, whereas the Portuguese estimates showed an increasing trend. GoC anchovy was widely distributed in the surveyed area, although avoided the easternmost waters. Higher densities were recorded between Alfanzina and west of Cape Santa Maria, in the Algarve, and between Isla Cristina and Bay of Cadiz. Anchovy acoustic estimates in autumn 2021, 17 512 t and 1973 million fish, experienced 38% and 51% decreases in abundance and biomass, respectively, in relation to the last year’s autumn estimates and they were lower than their time-series averages. The population was composed by fishes not older than 2 years. As usual, the bulk of the population, including juveniles, was located in Spanish waters. Age-0 anchovies accounted for 83% (1629 million) and 69% ... Report North Atlantic Digital.CSIC (Spanish National Research Council) |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Gulf of Cadiz Centro Oceanográfico de Cádiz Pesquerías Acoustic-trawl surveys Pelagic fish resources Spatial distribution Recruitment pelagic fish distribution species Acoustic data |
spellingShingle |
Gulf of Cadiz Centro Oceanográfico de Cádiz Pesquerías Acoustic-trawl surveys Pelagic fish resources Spatial distribution Recruitment pelagic fish distribution species Acoustic data Ramos, Fernando Córdoba-Sellés, María del Pilar Tornero, Jorge Sánchez-Barba, María José Navarro, María Rosario Acoustic assessment and distribution of the main pelagic fish species in ICES Subdivision 9a South during the ECOCADIZ-RECLUTAS 2021-10 Spanish survey (October 2021). |
topic_facet |
Gulf of Cadiz Centro Oceanográfico de Cádiz Pesquerías Acoustic-trawl surveys Pelagic fish resources Spatial distribution Recruitment pelagic fish distribution species Acoustic data |
description |
The present working document summarises the main results obtained from the ECOCADIZ-RECLUTAS 2021-10 Spanish (pelagic ecosystem-) acoustic-trawl survey conducted by IEO between 21st October and 07th November 2021 in the Portuguese and Spanish shelf waters (20-200 m isobaths) off the Gulf of Cadiz (GoC) onboard the R/V Ramón Margalef. The survey suffered a ten-day delay in relation to the usual starting dates. The survey’s main objective is the acoustic assessment of anchovy and sardine juveniles (age 0 fish) in the GoC recruitment areas. The 21 foreseen acoustic transects were sampled. A total of 18 valid fishing hauls were carried out for echo-trace ground-truthing purposes. Chub mackerel, anchovy and sardine were the most frequent captured species in the fishing hauls, followed by horse mackerel, bogue, Atlantic mackerel, Mediterranean horse mackerel and blue jack mackerel. Boarfish, longspine snipefish and pearlside showed an incidental occurrence in the hauls performed in the surveyed area. Sardine and chub mackerel showed the highest yields in these hauls, followed by anchovy and Mediterranean horse mackerel. Total and Spanish estimates of total NASC allocated to the “pelagic fish species assemblage” in this survey showed lower values than those recorded last year, whereas the Portuguese estimates showed an increasing trend. GoC anchovy was widely distributed in the surveyed area, although avoided the easternmost waters. Higher densities were recorded between Alfanzina and west of Cape Santa Maria, in the Algarve, and between Isla Cristina and Bay of Cadiz. Anchovy acoustic estimates in autumn 2021, 17 512 t and 1973 million fish, experienced 38% and 51% decreases in abundance and biomass, respectively, in relation to the last year’s autumn estimates and they were lower than their time-series averages. The population was composed by fishes not older than 2 years. As usual, the bulk of the population, including juveniles, was located in Spanish waters. Age-0 anchovies accounted for 83% (1629 million) and 69% ... |
format |
Report |
author |
Ramos, Fernando Córdoba-Sellés, María del Pilar Tornero, Jorge Sánchez-Barba, María José Navarro, María Rosario |
author_facet |
Ramos, Fernando Córdoba-Sellés, María del Pilar Tornero, Jorge Sánchez-Barba, María José Navarro, María Rosario |
author_sort |
Ramos, Fernando |
title |
Acoustic assessment and distribution of the main pelagic fish species in ICES Subdivision 9a South during the ECOCADIZ-RECLUTAS 2021-10 Spanish survey (October 2021). |
title_short |
Acoustic assessment and distribution of the main pelagic fish species in ICES Subdivision 9a South during the ECOCADIZ-RECLUTAS 2021-10 Spanish survey (October 2021). |
title_full |
Acoustic assessment and distribution of the main pelagic fish species in ICES Subdivision 9a South during the ECOCADIZ-RECLUTAS 2021-10 Spanish survey (October 2021). |
title_fullStr |
Acoustic assessment and distribution of the main pelagic fish species in ICES Subdivision 9a South during the ECOCADIZ-RECLUTAS 2021-10 Spanish survey (October 2021). |
title_full_unstemmed |
Acoustic assessment and distribution of the main pelagic fish species in ICES Subdivision 9a South during the ECOCADIZ-RECLUTAS 2021-10 Spanish survey (October 2021). |
title_sort |
acoustic assessment and distribution of the main pelagic fish species in ices subdivision 9a south during the ecocadiz-reclutas 2021-10 spanish survey (october 2021). |
publishDate |
2022 |
url |
http://hdl.handle.net/10508/16184 http://hdl.handle.net/10261/324526 |
op_coverage |
On-line (WebEx) Océan atlantique Atlantique Nord Atlantic Ocean Eastern Central Atlantic ICES Atlántico Centro-oriental Atlantique centre-est Gulf of Cadiz Golfo de Cádiz Atlantique central Atlántico Central Atlántico Norte Océano Atlántico Central Atlantic North Atlantic 2021 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Centro Oceanográfico de Cádiz ICES Working Group Southern horse mackerel, Anchovy and Sardine (WGHANSA-1) 2022. (23/05/2022 - 27/05/2022. On-line (WebEx)). 2022. http://hdl.handle.net/10508/16184 http://hdl.handle.net/10261/324526 50473 |
op_rights |
open |
_version_ |
1790604827437301760 |