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| Registros recuperados: 17 | |
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| Raveau, Adriana; Macher, Claire; Mehault, Sonia; Merzereaud, Mathieu; Le Grand, Christelle; Guyader, Olivier; Bertignac, Michel; Fifas, Spyros; Guillen Garcia, Jordi. |
| Several fleets with various fishing strategies operate as a mixed fishery in the Bay of Biscay. Among the main fleets, bottom trawlers target Norway lobster (Nephrops norvegicus) and, together with gillnetters, they also catch hake (Merluccius merluccius). Trawling leads to average-size catches that are below the minimum landing size (MLS); such catches are discarded since they cannot be sold. These discards result in negative impacts on stock renewal, as most of them do not survive. This also results in an economic loss for both bottom trawlers and gillnetters since these discards represent a future loss of rent. This study, based on the 2009 and 2010 selectivity experiments at sea, assesses the short- and long-term bio-economic impacts of four... |
| Tipo: Text |
Palavras-chave: Demersal trawl fishery; Bio-economic analysis; Selectivity; Simulation; Selective device; Nephrops norvegicus; Merluccius merluccius; Atlantic Ocean. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00110/22135/19774.pdf |
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| Merzereaud, Mathieu; Macher, Claire. |
| A R tool (SENSECO) has been developed in the BENTHIS project (task 5.1) to analyze economic consequences for fishing fleets or vessels of the adoption of new gears (or shift to alternative métier) in combination or substitution to the current gears (or métier). The tool adopts a microeconomic perspective. It performs static comparative analysis of economic performances under different conditions and assumptions of effort reallocation. It enables to analyze risk of gear change in terms of probability of being viable according to different criteria and to uncertainties parameters. It is also designed for exploration of economic impacts and economic incentives of alternative gear adoption according to expected CPUE, prices, or costs structure. The interactive... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00274/38556/37568.pdf |
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| Guillen, Jordi; Macher, Claire; Merzereaud, Mathieu; Bertignac, Michel; Fifas, Spyros; Guyader, Olivier. |
| Most worldwide fish stocks are overexploited, and so exploited beyond the Maximum Sustainable Yield (MSY) and the Maximum Economic Yield (MEY). Not exploiting fisheries resources at MSY or MEY leads to the loss of production and rents from the fisheries. A large part of the EU fisheries are managed based on single species stock assessments; however, in reality, most species are caught together with other species and by different fleets. In multi-species and multi-fleet fisheries, single species assessments, and consequently MSY and MEY reference points, are often not valid, and so the catch recommendations. In this paper it is investigated the MSY and MEY estimation in multi-species and multi-fleet fisheries in comparison to single species assessments.... |
| Tipo: Text |
Palavras-chave: MSY; MEY; Multi-species; Multi-fleet; Fisheries; Bio-economic model. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00129/24000/22053.pdf |
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| Biseau, Alain; Lissardy, Muriel; Marre, Guilhem; Daures, Fabienne; Macher, Claire; Merzereaud, Mathieu; Le Grand, Christelle; Gourguet, Sophie; Berthou, Patrick; Lehuta, Sigrid; Vermard, Youen; Savina-rolland, Marie. |
| Tipo: Text |
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| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00299/41034/79172.pdf |
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| Biseau, Alain; Gourguet, Sophie; Lavialle, Gael; Le Grand, Christelle; Leonardi, Sophie; Merzereaud, Mathieu; Thebaud, Olivier. |
| Dans sa saisine 14-7048 en date du 02 juillet 2014, la Direction des Pêches Maritimes et de l’Aquaculture (DPMA) expose la possibilité pour la pêcherie de sole (Solea solea) du golfe de Gascogne (Zones CIEM VIIIab) d’atteindre les objectifs de gestion fixés par la Politique Commune de la Pêche (PCP) entre 2015 et 2020. L’objectif de la saisine est d’analyser les impacts socioéconomiques des mesures de gestion qui pourraient être imposées pour atteindre le rendement maximum durable fixé par la PCP, notamment la fixation de Totaux Admissibles de Captures (TAC) constants et contraignants pour les professionnels. La DPMA sollicite l’expertise de l’Ifremer pour réaliser les travaux suivants : 1. Un bilan de l’importance économique et sociale du stock de sole... |
| Tipo: Text |
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| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00228/33958/32292.pdf |
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| Le Grand, Christelle; Merzereaud, Mathieu; Leonardi, Sophie; Guyader, Olivier. |
| This report presents the methodology used for the production of economic indicators on commercial fleets in Guyana and Guadeloupe. In a context of limited information, this document recalls the different data sources used to produce indicators at the scale of vessels and fleet segments (fleet, activity, effort and landing data, socio-economic surveys and other local data, etc). The method for calculating the economic indicators requested as part of the European data collection program is then described. A detailed list of the variables used for the production of these idicators is provided in the appendix. |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00649/76107/77061.pdf |
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| Nielsen, J. Rasmus; Thunberg, Eric; Holland, Daniel S.; Schmidt, Jorn O.; Fulton, Elizabeth A.; Bastardie, Francois; Punt, Andre E.; Allen, Icarus; Bartelings, Heleen; Bertignac, Michel; Bethke, Eckhard; Bossier, Sieme; Buckworth, Rik; Carpenter, Griffin; Christensen, Asbjorn; Christensen, Villy; Da-rocha, Jose M.; Deng, Roy; Dichmont, Catherine; Doering, Ralf; Esteban, Aniol; Fernandes, Jose A.; Frost, Hans; Garcia, Dorleta; Gasche, Loic; Gascuel, Didier; Gourguet, Sophie; Groeneveld, Rolf A.; Guillen, Jordi; Guyader, Olivier; Hamon, Katell; Hoff, Ayoe; Horbowy, Jan; Hutton, Trevor; Lehuta, Sigrid; Little, L. Richard; Lleonart, Jordi; Macher, Claire; Mackinson, Steven; Mahevas, Stephanie; Marchal, Paul; Mato-amboage, Rosa; Mapstone, Bruce; Maynou, Francesc; Merzereaud, Mathieu; Palacz, Artur; Pascoe, Sean; Paulrud, Anton; Plaganyi, Eva; Prellezo, Raul; Van Putten, Elizabeth I.; Quaas, Martin; Ravn-jonsen, Lars; Sanchez, Sonia; Simons, Sarah; Thebaud, Olivier; Tomczak, Maciej T.; Ulrich, Clara; Van Dijk, Diana; Vermard, Youen; Voss, Rudi; Waldo, Staffan. |
| Marine ecosystems evolve under many interconnected and area-specific pressures. To fulfil society's intensifying and diversifying needs while ensuring ecologically sustainable development, more effective marine spatial planning and broader-scope management of marine resources is necessary. Integrated ecological–economic fisheries models (IEEFMs) of marine systems are needed to evaluate impacts and sustainability of potential management actions and understand, and anticipate ecological, economic and social dynamics at a range of scales from local to national and regional. To make these models most effective, it is important to determine how model characteristics and methods of communicating results influence the model implementation, the nature of the... |
| Tipo: Text |
Palavras-chave: Bio-economic models; Comparative model evaluation; Fisheries management advice; Integrated ecological-economic fisheries models; Marine spatial planning and cross-sector management; Performance criteria and scales and risks; Use and acceptance and implementation and communication and flexibility and complexity. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00391/50269/50898.pdf |
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| Bellanger, Manuel; Macher, Claire; Merzereaud, Mathieu; Guyader, Olivier; Le Grand, Christelle. |
| An individual-based bio-economic model (IAM) is presented and applied to the Bay of Biscay sole fishery to investigate alternative quota management systems from a multi-criteria perspective. For this study, the model integrates several institutional arrangements related to catch share management. The current French co-management system with non-transferability of quota is compared to an alternative ITQ system in a context of transition to maximum sustainable yield (MSY). Trade-offs between ecological and socio-economic impacts are highlighted and the effectiveness of governance scenarios is discussed in regard to the challenge of capacity adjustment. Results emphasize that the introduction of ITQ is expected to reduce by 40% the number of vessels in the... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00416/52779/53659.pdf |
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| Leonardi, Sophie; Le Grand, Christelle; Merzereaud, Mathieu; Bettali, Tiphaine; Blanchard, Fabian; Mansuy, Emmanuel; Cisse, Abdoul; Guyader, Olivier. |
| This report describes the methodology for collecting economic data on commercial fleets in Guyana and Guadeloupe during the 2020 survey. The context and the objectives for producing indicators within the EU data collection framework, the survey is presented including the organization and collection procedure, field training and reporting as well as communication. The links to the technical documents are provided in particular the questionnaire used. The collection sampling plan is detailed with a description of, the reference population, the stratified sampling frame, the calculation of the sampling allocations. The samples are also described. The annex presents a summary of the questionnaire. |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00649/76105/77060.pdf |
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| Briton, Florence; Macher, Claire; Merzereaud, Mathieu; Legrand, Christelle; Fifas, Spyros; Thebaud, Olivier. |
| Well-established single-species approaches are not adapted to the management of mixed fisheries where multiple species are simultaneously caught in unselective fishing operations. In particular, ignoring joint production when setting total allowable catches (TACs) for individual species is likely to lead to over-quota discards or, when discards are not allowed, to lost fishing opportunities. Furthermore, economic and social objectives have been poorly addressed in the design of fisheries harvest strategies, despite being an explicit objective of ecosystem-based fisheries management in many jurisdictions worldwide. We introduce the notion of operating space as the ensemble of reachable, single-species fishing mortality targets, given joint production in a... |
| Tipo: Text |
Palavras-chave: Eco-viability; Mixed fisheries management; Bio-economic modelling; Integrated TAC advice. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00624/73614/73030.pdf |
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| Guillen, Jordi; Macher, Claire; Merzereaud, Mathieu; Fifas, Spyros; Guyader, Olivier. |
| MSY objectives are being adopted as major fisheries management targets worldwide. However, in fisheries where discards account for an important share of the catches, the yield, effort, and biomass at MSY can be significantly different when accounting or not for discards and thus when, basing the yield estimations on landings or catches. Also whether accounting for a certain survival rate, of discards can lead to different MSY targets estimates. Hence, both decisions have important, implications on catch and effort reduction recommendations, and consequently on the quota, calculations for fisheries managed by quotas. Results from the Bay of Biscay nephrops fishery confirm, that the optimal exploitation level can vary significantly when optimising for... |
| Tipo: Text |
Palavras-chave: Maximum Sustainable Yield (MSY); Discards; Nephrops; Survival rate. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00201/31180/29867.pdf |
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| Macher, Claire; Bertignac, Michel; Guyader, Olivier; Frangoudes, Katia; Fresard, Marjolaine; Le Grand, Christelle; Merzereaud, Mathieu; Thebaud, Olivier. |
| In the context of the Common Fisheries Policy Reform, the implementation of multiannual management plans for fisheries and the annual quota negotiations between EU member states has generated a growing demand from stakeholders and managers for integrated advice that goes beyond the usual biological advice. This has led to the emergence of bio-economic tools and methods for the comparison of the biological, economic and social tradeoffs associated with alternative options for fisheries management. A Decision Support Framework (DSF) has been developed in this context, with the objective to tackle technical and methodological challenges to be able to provide bio-economic advices to support decision at national and European level. It is based on a partnership... |
| Tipo: Text |
Palavras-chave: Participatory approach; Stakeholder engagement; Decision-support; Bio-economic modelling; Fisheries management; Impact assessment. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00445/55698/57395.pdf |
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| Registros recuperados: 17 | |
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