PELACUS 0314 CRUISE REPORT
The Spanish acoustic-trawl times PELACUS 0314 was carried out on board R/V Miguel Oliver from 9th March to 8th April, covering the north Spanish waters (Atlantic and Bay of Biscay) from the coast to the 1000 m isobath on a systematic grid with tracks 8 nmi apart and equally spaced. Acoustic , fishin...
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ftcsic:oai:digital.csic.es:10261/328997 2024-02-11T10:06:47+01:00 PELACUS 0314 CRUISE REPORT Carrera, Pablo Riveiro, Isabel Santos, María Begoña Louzao-Arsuaga, Maite Murcia, José Luis Valeiras, Julio García-Barcelona, Salvador Vázquez, José Antonio Preciado, Izaskun Carrera, P. (Pablo) Riveiro, I. (Isabel) Atlantic Ocean Copenhaguen (Denmark) North Atlantic Northeast Atlantic North Sea ICES IXaN y VIIIc Bay of Biscay March-April 2014 2015-02-04 http://hdl.handle.net/10508/8756 http://hdl.handle.net/10261/328997 en eng Centro Oceanográfico de Vigo wga. (17/11/2014 - 21/11/2014. Copenhague (Dinamarca)). . Cruise report http://hdl.handle.net/10508/8756 http://hdl.handle.net/10261/328997 20562 open Pesquerías Centro Oceanográfico de Vigo Acoustic abundance estimation echointegration cufes Bay of Biscay sardine pelagic ecosystem acoustic-trawl survey report 2015 ftcsic 2024-01-16T11:49:35Z The Spanish acoustic-trawl times PELACUS 0314 was carried out on board R/V Miguel Oliver from 9th March to 8th April, covering the north Spanish waters (Atlantic and Bay of Biscay) from the coast to the 1000 m isobath on a systematic grid with tracks 8 nmi apart and equally spaced. Acoustic , fishing stations, fish egg counting, microplastic, and apical predators observations were done during daytime whilst the oceanographic characterisation was done during night time. A total of 1903 nautical miles were steamed, 1075 corresponding to the survey track. Besides 52 fishing stations were performed (Figure 2). PELCACUS 0314 was characterised by relative stable weather conditions along the surveyed area. Besides, there was an important increase in backscattering energy as compared with the previous year. This resulted in an increase of the biomass estimated for the majority of the fish species, but still sardine is at lowest productivity ever recorded. Good recruitment would be observed in horse mackerel, but for the rest of the fish species, no strong signals for age group 1 have been detected. The reasons for this increase would be related to the weather stability which could have increased the fish availability either for a change in the behaviour (i.e. spatial pattern distribution) or for an increase in the food availability. This is relevant accounting the increase of the occurrence of mackerel subsurface layers observed this year. As PELACUS is a multidisciplinary survey series (we collect environmental and biological ancillary information, stomach contents, including CTD cats, plankton tows or continuous records of plankton, eggs, S, T and flourometry), we will try to explain this change of behaviour. Our main hypothesis is that these species could follow mackerel when is undertaking vertical migration, probably related with the spawning activity, just for feeding eggs and, therefore, changing the expected schooling behaviour by the dispersed one, used during the feeding activity. Report North Atlantic Northeast Atlantic Digital.CSIC (Spanish National Research Council) |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Pesquerías Centro Oceanográfico de Vigo Acoustic abundance estimation echointegration cufes Bay of Biscay sardine pelagic ecosystem acoustic-trawl survey |
spellingShingle |
Pesquerías Centro Oceanográfico de Vigo Acoustic abundance estimation echointegration cufes Bay of Biscay sardine pelagic ecosystem acoustic-trawl survey Carrera, Pablo Riveiro, Isabel Santos, María Begoña Louzao-Arsuaga, Maite Murcia, José Luis Valeiras, Julio García-Barcelona, Salvador Vázquez, José Antonio Preciado, Izaskun PELACUS 0314 CRUISE REPORT |
topic_facet |
Pesquerías Centro Oceanográfico de Vigo Acoustic abundance estimation echointegration cufes Bay of Biscay sardine pelagic ecosystem acoustic-trawl survey |
description |
The Spanish acoustic-trawl times PELACUS 0314 was carried out on board R/V Miguel Oliver from 9th March to 8th April, covering the north Spanish waters (Atlantic and Bay of Biscay) from the coast to the 1000 m isobath on a systematic grid with tracks 8 nmi apart and equally spaced. Acoustic , fishing stations, fish egg counting, microplastic, and apical predators observations were done during daytime whilst the oceanographic characterisation was done during night time. A total of 1903 nautical miles were steamed, 1075 corresponding to the survey track. Besides 52 fishing stations were performed (Figure 2). PELCACUS 0314 was characterised by relative stable weather conditions along the surveyed area. Besides, there was an important increase in backscattering energy as compared with the previous year. This resulted in an increase of the biomass estimated for the majority of the fish species, but still sardine is at lowest productivity ever recorded. Good recruitment would be observed in horse mackerel, but for the rest of the fish species, no strong signals for age group 1 have been detected. The reasons for this increase would be related to the weather stability which could have increased the fish availability either for a change in the behaviour (i.e. spatial pattern distribution) or for an increase in the food availability. This is relevant accounting the increase of the occurrence of mackerel subsurface layers observed this year. As PELACUS is a multidisciplinary survey series (we collect environmental and biological ancillary information, stomach contents, including CTD cats, plankton tows or continuous records of plankton, eggs, S, T and flourometry), we will try to explain this change of behaviour. Our main hypothesis is that these species could follow mackerel when is undertaking vertical migration, probably related with the spawning activity, just for feeding eggs and, therefore, changing the expected schooling behaviour by the dispersed one, used during the feeding activity. |
author2 |
Carrera, P. (Pablo) Riveiro, I. (Isabel) |
format |
Report |
author |
Carrera, Pablo Riveiro, Isabel Santos, María Begoña Louzao-Arsuaga, Maite Murcia, José Luis Valeiras, Julio García-Barcelona, Salvador Vázquez, José Antonio Preciado, Izaskun |
author_facet |
Carrera, Pablo Riveiro, Isabel Santos, María Begoña Louzao-Arsuaga, Maite Murcia, José Luis Valeiras, Julio García-Barcelona, Salvador Vázquez, José Antonio Preciado, Izaskun |
author_sort |
Carrera, Pablo |
title |
PELACUS 0314 CRUISE REPORT |
title_short |
PELACUS 0314 CRUISE REPORT |
title_full |
PELACUS 0314 CRUISE REPORT |
title_fullStr |
PELACUS 0314 CRUISE REPORT |
title_full_unstemmed |
PELACUS 0314 CRUISE REPORT |
title_sort |
pelacus 0314 cruise report |
publishDate |
2015 |
url |
http://hdl.handle.net/10508/8756 http://hdl.handle.net/10261/328997 |
op_coverage |
Atlantic Ocean Copenhaguen (Denmark) North Atlantic Northeast Atlantic North Sea ICES IXaN y VIIIc Bay of Biscay March-April 2014 |
genre |
North Atlantic Northeast Atlantic |
genre_facet |
North Atlantic Northeast Atlantic |
op_relation |
Centro Oceanográfico de Vigo wga. (17/11/2014 - 21/11/2014. Copenhague (Dinamarca)). . Cruise report http://hdl.handle.net/10508/8756 http://hdl.handle.net/10261/328997 20562 |
op_rights |
open |
_version_ |
1790604739076947968 |