Modeling discards in Trawling Mediterranean Northern Alboran Sea Fishery

Abstract

Event Abstract Back to Event Modeling discards in Trawling Mediterranean Northern Alboran Sea Fishery Ana Carbonell Quetglas1*, Iosu Paradinas2, Sandra Mallol1, Teresa Garcia3, Maria Gonzalez3, Diego Álvarez-Berastegui4, Cristina Bultó5 and Jose M. Bellido5 1 Instituto Español de Oceanografia, Fisheries, Spain 2 Universitat de Valencia, Departament de Estadística e Investigación Operativa, Spain 3 Centro Oceanográfico de Málaga, Fisheries, Instituto Español de Oceanografía, Spain 4 Balearic Islands Coastal Observing and Forecasting System, Spain 5 Centro Oceanográfico de Murcia, Fisheries, Instituto Español de Oceanografía, Spain, Spain Target and Bycatch species metrics estimated from fishery-dependent data were explored to assess their use in governance of habitat conservation in respect to fisheries. Fishing data collected by onboard observers in otter-trawl boats between 2011 and 2012 at monthly sampling frequency in the Alboran Sea (Western Mediterranean) were used to build maps of sensitivity to fishing stress. Maps were drawn by means kriging interpolation techniques of biomass and abundance (Catch Per Unit of Effort, CPUE) in kilogram and number per fishing hour of blue whiting (Micromesistius poutassou), European hake (Merluccius merluccius), and red mullets (Mullus barbatus and Mullus surmuletus) target species, seabreams (Pagellus acarne, Pagellus bogaraveo, and Pagellus erythrinus), and mackerels (Trachurus mediterraneus, Trachurus trachurus, and Trachurus picturatus) bycatch species and Bogue (Boops boops) bycatch discarded species. Modelling discards by means Generalised Additive Models (GAMs) use environmental (sea surface temperature and chlorophyll-a from satellite data and NAO climatic index); spatial (latitude, longitude, depth and port) and temporal (season, haul duration, moon phase), as well as technical (boat length and power) explanatory variables. The main causes of discards, for both target and bycatch species, are associated to the seasonality of the recruitment and the changes on the spatial distribution of habitat preferences along their ontogeny. Environmental variables did not reveal significant effects, showing that operational oceanography standard products must be not enough to assess discards, and therefore products providing information on specific ecological processes to discards must be designed with this purpose. In Bycatch species, such as sea breams, mackerels and bogue, discards were also highly dependent of the port and boat (fleet/boat strategies, power, etc, and market preferences). The higher discards corresponded to these bycatch pelagic or bentho-pelagic species. Keywords: Discards, Otter-trawl fisheries, fishery conservation, operational oceanography, spatial modeling Keywords: Discards, Otter-trawl fisheries, Fishery conservation, Operational Oceanography, spatial modeling Conference: XIX Iberian Symposium on Marine Biology Studies, Porto, Portugal, 5 Sep - 9 Sep, 2016. Presentation Type: Poster Presentation Topic: 4. FISHERIES, AQUACULTURE AND BIOTECHNOLOGY Citation: Carbonell Quetglas A, Paradinas I, Mallol S, Garcia T, Gonzalez M, Álvarez-Berastegui D, Bultó C and Bellido JM (2016). Modeling discards in Trawling Mediterranean Northern Alboran Sea Fishery. Front. Mar. Sci. Conference Abstract: XIX Iberian Symposium on Marine Biology Studies. doi: 10.3389/conf.FMARS.2016.05.00202 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 30 Apr 2016; Published Online: 03 Sep 2016. * Correspondence: Dr. Ana Carbonell Quetglas, Instituto Español de Oceanografia, Fisheries, Palma, Illes Balears, 07015, Spain, ana.carbonell@ba.ieo.es Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Ana Carbonell Quetglas Iosu Paradinas Sandra Mallol Teresa Garcia Maria Gonzalez Diego Álvarez-Berastegui Cristina Bultó Jose M Bellido Google Ana Carbonell Quetglas Iosu Paradinas Sandra Mallol Teresa Garcia Maria Gonzalez Diego Álvarez-Berastegui Cristina Bultó Jose M Bellido Google Scholar Ana Carbonell Quetglas Iosu Paradinas Sandra Mallol Teresa Garcia Maria Gonzalez Diego Álvarez-Berastegui Cristina Bultó Jose M Bellido PubMed Ana Carbonell Quetglas Iosu Paradinas Sandra Mallol Teresa Garcia Maria Gonzalez Diego Álvarez-Berastegui Cristina Bultó Jose M Bellido Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.