Modelling trawling discards of the Alboran fisheries in the Mediterranean Sea

The ecosystem processes underlying the discard rates of the demersal otter-trawl fishery in the Alboran Sea, Western Mediterranean are investigated. We evaluate whether environmental and climatic variability, measured from operational oceanographic data, allow assessment of discarded species abundan...

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Published in:Regional Studies in Marine Science
Main Authors: Carbonell, Ana, García, T., González-Aguilar, María, Álvarez-Berastegui, Diego, Mallol, Sandra, De La Serna, J. M., Bultó-Estébanez, Cristina, Bellido-Millán, José María, Barcala-Bellod, Elena, Baro, Jorge
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier BV 2018
Subjects:
NAO
Gam
Online Access:http://hdl.handle.net/10261/323082
https://doi.org/10.1016/j.rsma.2017.11.010
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spelling ftcsic:oai:digital.csic.es:10261/323082 2024-02-11T10:06:37+01:00 Modelling trawling discards of the Alboran fisheries in the Mediterranean Sea Carbonell, Ana García, T. González-Aguilar, María Álvarez-Berastegui, Diego Mallol, Sandra De La Serna, J. M. Bultó-Estébanez, Cristina Bellido-Millán, José María Barcala-Bellod, Elena Baro, Jorge 2018 http://hdl.handle.net/10261/323082 https://doi.org/10.1016/j.rsma.2017.11.010 en eng Elsevier BV Centro Oceanográfico de Baleares 2352-4855 http://hdl.handle.net/10261/323082 doi:10.1016/j.rsma.2017.11.010 23475 none Discards Centro Oceanográfico de Baleares Pesquerías Otter-trawl fisheries Fishery conservation Operational oceanography NAO artículo http://purl.org/coar/resource_type/c_6501 2018 ftcsic https://doi.org/10.1016/j.rsma.2017.11.010 2024-01-16T11:46:57Z The ecosystem processes underlying the discard rates of the demersal otter-trawl fishery in the Alboran Sea, Western Mediterranean are investigated. We evaluate whether environmental and climatic variability, measured from operational oceanographic data, allow assessment of discarded species abundances. Monthly data collected by onboard fishery observers during 2011 and 2012 in the Northern Alboran Sea served as a case study of the trawling fishery’s dynamics. The study area was split into west and east zones to account for differences in the Atlantic and Mediterranean Sea water influences, for distinct geomorphology and for species composition of catches. Sixteen species divided in three groups were analysed: species without discards, those partially discarded and those completely discarded. Applying Gaussian Generalized Additive Models (GAM), we tested the relationships of standard oceanographic data products and climatic variability with discard abundances. These variables were sea surface temperature (SST) and chlorophyll a (chl-a) from satellite imagery, as indicators of environmental conditions, and the North Atlantic Oscillation index (NAO) as a climatic indicator. Models were applied for target and bycatch species partially discarded. These were the following species: gadoid like European hake (Merluccius merluccius), Blue Whiting (Micromesistius poutassou), Seabreams (Pagellus acarne, and Pagellus erythrinus), and Mackerels (Trachurus mediterraneus, Trachurus picturatus and Trachurus trachurus). Surface seawater temperature was a relevant variable in coastal and eastern, more haline Mediterranean waters. Climatic variability represented by NAO was useful for assessing discard rates in the more productive western zone. Chlorophyll a showed less relevance for discard prediction models, but it was more related in the coastal zones. Including oceanographic data products and climatic patterns in GAM models of fishery discards provides a new perspective that may improve our predictive capabilities for ... Article in Journal/Newspaper North Atlantic North Atlantic oscillation Digital.CSIC (Spanish National Research Council) Gam ENVELOPE(-57.955,-57.955,-61.923,-61.923) Hake ENVELOPE(15.612,15.612,66.797,66.797) Regional Studies in Marine Science 23 73 86
institution Open Polar
collection Digital.CSIC (Spanish National Research Council)
op_collection_id ftcsic
language English
topic Discards
Centro Oceanográfico de Baleares
Pesquerías
Otter-trawl fisheries
Fishery conservation
Operational oceanography
NAO
spellingShingle Discards
Centro Oceanográfico de Baleares
Pesquerías
Otter-trawl fisheries
Fishery conservation
Operational oceanography
NAO
Carbonell, Ana
García, T.
González-Aguilar, María
Álvarez-Berastegui, Diego
Mallol, Sandra
De La Serna, J. M.
Bultó-Estébanez, Cristina
Bellido-Millán, José María
Barcala-Bellod, Elena
Baro, Jorge
Modelling trawling discards of the Alboran fisheries in the Mediterranean Sea
topic_facet Discards
Centro Oceanográfico de Baleares
Pesquerías
Otter-trawl fisheries
Fishery conservation
Operational oceanography
NAO
description The ecosystem processes underlying the discard rates of the demersal otter-trawl fishery in the Alboran Sea, Western Mediterranean are investigated. We evaluate whether environmental and climatic variability, measured from operational oceanographic data, allow assessment of discarded species abundances. Monthly data collected by onboard fishery observers during 2011 and 2012 in the Northern Alboran Sea served as a case study of the trawling fishery’s dynamics. The study area was split into west and east zones to account for differences in the Atlantic and Mediterranean Sea water influences, for distinct geomorphology and for species composition of catches. Sixteen species divided in three groups were analysed: species without discards, those partially discarded and those completely discarded. Applying Gaussian Generalized Additive Models (GAM), we tested the relationships of standard oceanographic data products and climatic variability with discard abundances. These variables were sea surface temperature (SST) and chlorophyll a (chl-a) from satellite imagery, as indicators of environmental conditions, and the North Atlantic Oscillation index (NAO) as a climatic indicator. Models were applied for target and bycatch species partially discarded. These were the following species: gadoid like European hake (Merluccius merluccius), Blue Whiting (Micromesistius poutassou), Seabreams (Pagellus acarne, and Pagellus erythrinus), and Mackerels (Trachurus mediterraneus, Trachurus picturatus and Trachurus trachurus). Surface seawater temperature was a relevant variable in coastal and eastern, more haline Mediterranean waters. Climatic variability represented by NAO was useful for assessing discard rates in the more productive western zone. Chlorophyll a showed less relevance for discard prediction models, but it was more related in the coastal zones. Including oceanographic data products and climatic patterns in GAM models of fishery discards provides a new perspective that may improve our predictive capabilities for ...
format Article in Journal/Newspaper
author Carbonell, Ana
García, T.
González-Aguilar, María
Álvarez-Berastegui, Diego
Mallol, Sandra
De La Serna, J. M.
Bultó-Estébanez, Cristina
Bellido-Millán, José María
Barcala-Bellod, Elena
Baro, Jorge
author_facet Carbonell, Ana
García, T.
González-Aguilar, María
Álvarez-Berastegui, Diego
Mallol, Sandra
De La Serna, J. M.
Bultó-Estébanez, Cristina
Bellido-Millán, José María
Barcala-Bellod, Elena
Baro, Jorge
author_sort Carbonell, Ana
title Modelling trawling discards of the Alboran fisheries in the Mediterranean Sea
title_short Modelling trawling discards of the Alboran fisheries in the Mediterranean Sea
title_full Modelling trawling discards of the Alboran fisheries in the Mediterranean Sea
title_fullStr Modelling trawling discards of the Alboran fisheries in the Mediterranean Sea
title_full_unstemmed Modelling trawling discards of the Alboran fisheries in the Mediterranean Sea
title_sort modelling trawling discards of the alboran fisheries in the mediterranean sea
publisher Elsevier BV
publishDate 2018
url http://hdl.handle.net/10261/323082
https://doi.org/10.1016/j.rsma.2017.11.010
long_lat ENVELOPE(-57.955,-57.955,-61.923,-61.923)
ENVELOPE(15.612,15.612,66.797,66.797)
geographic Gam
Hake
geographic_facet Gam
Hake
genre North Atlantic
North Atlantic oscillation
genre_facet North Atlantic
North Atlantic oscillation
op_relation Centro Oceanográfico de Baleares
2352-4855
http://hdl.handle.net/10261/323082
doi:10.1016/j.rsma.2017.11.010
23475
op_rights none
op_doi https://doi.org/10.1016/j.rsma.2017.11.010
container_title Regional Studies in Marine Science
container_volume 23
container_start_page 73
op_container_end_page 86
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