The Experts below are selected from a list of 192 Experts worldwide ranked by ideXlab platform
O. Guyader - One of the best experts on this subject based on the ideXlab platform.
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A Bio-Economic Model for the Viable Managementof the Coastal Fishery in French Guyana
2020Co-Authors: Abdoul Cisse, Fabian Blanchard, Luc Doyen, Jean-christophe Pereau, Sophie Gourguet, O. GuyaderAbstract:The Coastal Fishery in French Guyana is a challenging case study for the implementation of the ecosystem based Fishery management. Although the current situation of this small scale Fishery could be considered as satisfactory, the viability of the Fishery can be questioned. Indeed according to demographic scenarios, the growth of the population will generate an increase of local food demand and therefore growing fishing pressures. Moreover, there is no direct regulation for limiting the fishing catches. Models and quantitative methods to tackle this sustainability issue are still lacking for such mall-scale fisheries mainly because of the various complexities underlying the systems including the heterogeneity of the production factors, the weak selectivity of fleets and high fish biodiversity levels. In the present paper, we both use numerical simulations and a viability perspective to deal with such a problem. We first build a multispecies multi-fleets dynamic model relying on thirteen exploited species and four types of fleets. It accounts for potential trophic interactions, fishing effort and the corresponding costs and revenues. The model was fit on data collected since 2006 by Ifremer: daily production and efforts data, as well as economic data from a survey on the production costs and selling prices in 2009.The co-viability of the system under different scenarios of fishing efforts is studied through ecological and economic performances. The biological viability constraints focus on biodiversity index as species richness or trophic index while economic viability constraints intend to guarantee profitability to all the fleets.
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Sustainability of tropical small-scale fisheries: Integrated assessment in French Guiana
Marine Policy, 2014Co-Authors: Abdoul Ahad Cissé, Fabian Blanchard, O. GuyaderAbstract:Like many tropical small-scale fisheries, the French Guiana Coastal Fishery is characterized by the high fish biodiversity of its ecosystem, the weak selectivity of the fleets exploiting the resources, and the heterogeneity of the vessels in terms of size and fishing techniques. The Rapfish method is used to assess sustainability within 11 Fishery systems by means of 27 attributes relating to ecological, economic, social, and technological fields. Overall results indicate an average performance in the weak sustainability range. Comparisons made among the FSs show a gradient of sustainability performance from the western portion of the coast to the eastern portion. Several recommendations are formulated to raise the current "sustainability" status, such as the reduction of discards. This study is used as a complementary tool to the bioeconomic model in order to define a sustainable management plan for the French Guiana Coastal Fishery. © 2013 Elsevier Ltd.
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Integrated assessment of the Coastal Fishery production systems in French Guiana
2013Co-Authors: Abdoul Cisse, Fabian Blanchard, O. GuyaderAbstract:Like many cases of tropical small-scale fisheries, the French Guiana Coastal Fishery is characterized by the high fish biodiversity of its ecosystem, the weak selectivity of the fleets exploiting the resources and the heterogeneity of the vessels in terms of size and fishing techniques. We use Rapfish method [Pitcher & Preikshot, 2001] to assess sustainability within 11 Fishery systems in the ecological, economic, social and technological fields through 27 attributes. Overall results point out an average performance in the scale of sustainability. Comparisons made among the FSs show a gradient of sustainability performance from the west coast to the east coast. Several recommendations have been formulated to raise the current ‘sustainability’ status as for example the reduction of discards. This study is postulated as a complementary tool to bioeconomic model in order to define a sustainable management of the French Guiana costal Fishery.
Fabian Blanchard - One of the best experts on this subject based on the ideXlab platform.
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A Bio-Economic Model for the Viable Managementof the Coastal Fishery in French Guyana
2020Co-Authors: Abdoul Cisse, Fabian Blanchard, Luc Doyen, Jean-christophe Pereau, Sophie Gourguet, O. GuyaderAbstract:The Coastal Fishery in French Guyana is a challenging case study for the implementation of the ecosystem based Fishery management. Although the current situation of this small scale Fishery could be considered as satisfactory, the viability of the Fishery can be questioned. Indeed according to demographic scenarios, the growth of the population will generate an increase of local food demand and therefore growing fishing pressures. Moreover, there is no direct regulation for limiting the fishing catches. Models and quantitative methods to tackle this sustainability issue are still lacking for such mall-scale fisheries mainly because of the various complexities underlying the systems including the heterogeneity of the production factors, the weak selectivity of fleets and high fish biodiversity levels. In the present paper, we both use numerical simulations and a viability perspective to deal with such a problem. We first build a multispecies multi-fleets dynamic model relying on thirteen exploited species and four types of fleets. It accounts for potential trophic interactions, fishing effort and the corresponding costs and revenues. The model was fit on data collected since 2006 by Ifremer: daily production and efforts data, as well as economic data from a survey on the production costs and selling prices in 2009.The co-viability of the system under different scenarios of fishing efforts is studied through ecological and economic performances. The biological viability constraints focus on biodiversity index as species richness or trophic index while economic viability constraints intend to guarantee profitability to all the fleets.
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Sustainability of tropical small-scale fisheries: Integrated assessment in French Guiana
Marine Policy, 2014Co-Authors: Abdoul Ahad Cissé, Fabian Blanchard, O. GuyaderAbstract:Like many tropical small-scale fisheries, the French Guiana Coastal Fishery is characterized by the high fish biodiversity of its ecosystem, the weak selectivity of the fleets exploiting the resources, and the heterogeneity of the vessels in terms of size and fishing techniques. The Rapfish method is used to assess sustainability within 11 Fishery systems by means of 27 attributes relating to ecological, economic, social, and technological fields. Overall results indicate an average performance in the weak sustainability range. Comparisons made among the FSs show a gradient of sustainability performance from the western portion of the coast to the eastern portion. Several recommendations are formulated to raise the current "sustainability" status, such as the reduction of discards. This study is used as a complementary tool to the bioeconomic model in order to define a sustainable management plan for the French Guiana Coastal Fishery. © 2013 Elsevier Ltd.
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a bio economic model for the ecosystem based management of the Coastal Fishery in french guiana
Environment and Development Economics, 2013Co-Authors: Abdoul Cisse, Fabian Blanchard, Luc Doyen, Sophie Gourguet, Jean-christophe PereauAbstract:This paper offers a theoretical and empirical model of ecosystem-based Fishery management. A multi-species and multi-fleet model integrating Lotka–Volterra trophic dynamics as well as production and profit assessments is developed and applied to the Coastal Fishery of French Guiana. This small-scale Fishery constitutes a challenging example with high fish biodiversity, several non-selective fleets and a potentially increasing local food demand due to demographic growth. The dynamic model is calibrated with 13 species and four fleets using monthly catch and effort data from 2006 to 2009. Several contrasted fishing scenarios including status quo, total closure, economic and viable strategies are then simulated. They are compared from the viewpoints of both biodiversity preservation and socioeconomic performance, assuming fixed landing prices and fixed costs. We show that fishing outputs, including food supply and fleet profitability, can be sustained on average but a loss of species cannot be avoided.
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Stochastic viability of the Coastal Fishery in French Guiana
2013Co-Authors: Abdoul Cisse, Fabian Blanchard, Luc Doyen, Jean-christophe PereauAbstract:This paper presents an application of stochastic viability approach in a tropical small scale Fishery context, offering a theoretical and empirical model of ecosystem-based Fishery management. A multi-species and multi-fleet bio-economic model integrating Lotka-Volterra trophic dynamics as well as production and profit assessments is applied to the French Guiana Coastal Fishery. This case study is interesting as consistent time series data are available with data collection system set up since 2006. The dynamic model is calibrated with thirteen species and four fleets using monthly catch and effort data from 2006 to 2010. We compare different management strategies relying on different combinations of fishing effort, from the viewpoints of both biodiversity preservation and socio-economic performance, assuming fixed landing prices and fixed costs. The risk for the Fishery to mismatch the potential local fish demand growth is pointed out, as well as the loss of species which cannot be avoided without closure.
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Integrated assessment of the Coastal Fishery production systems in French Guiana
2013Co-Authors: Abdoul Cisse, Fabian Blanchard, O. GuyaderAbstract:Like many cases of tropical small-scale fisheries, the French Guiana Coastal Fishery is characterized by the high fish biodiversity of its ecosystem, the weak selectivity of the fleets exploiting the resources and the heterogeneity of the vessels in terms of size and fishing techniques. We use Rapfish method [Pitcher & Preikshot, 2001] to assess sustainability within 11 Fishery systems in the ecological, economic, social and technological fields through 27 attributes. Overall results point out an average performance in the scale of sustainability. Comparisons made among the FSs show a gradient of sustainability performance from the west coast to the east coast. Several recommendations have been formulated to raise the current ‘sustainability’ status as for example the reduction of discards. This study is postulated as a complementary tool to bioeconomic model in order to define a sustainable management of the French Guiana costal Fishery.
James D Scott - One of the best experts on this subject based on the ideXlab platform.
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forecasting the dynamics of a Coastal Fishery species using a coupled climate population model
Ecological Applications, 2010Co-Authors: Jonathan A Hare, Michael A Alexander, Michael J Fogarty, Erik H Williams, James D ScottAbstract:Marine fisheries management strives to maintain sustainable populations while allowing exploitation. However, well-intentioned management plans may not meet this balance as most do not include the effect of climate change. Ocean temperatures are expected to increase through the 21st century, which will have far-reaching and complex impacts on marine fisheries. To begin to quantify these impacts for one Coastal Fishery along the east coast of the United States, we develop a coupled climate–population model for Atlantic croaker (Micropogonias undulatus). The model is based on a mechanistic hypothesis: recruitment is determined by temperature-driven, overwinter mortality of juveniles in their estuarine habitats. Temperature forecasts were obtained from 14 general circulation models simulating three CO2 emission scenarios. An ensemble-based approach was used in which a multimodel average was calculated for a given CO2 emission scenario to forecast the response of the population. The coupled model indicates th...
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Forecasting the dynamics of a Coastal Fishery species using a coupled climate?population model
Ecological Applications, 2010Co-Authors: Jonathan A Hare, Michael A Alexander, Michael J Fogarty, Erik H Williams, James D ScottAbstract:Marine fisheries management strives to maintain sustainable populations while allowing exploitation. However, well-intentioned management plans may not meet this balance as most do not include the effect of climate change. Ocean temperatures are expected to increase through the 21st century, which will have far-reaching and complex impacts on marine fisheries. To begin to quantify these impacts for one Coastal Fishery along the east coast of the United States, we develop a coupled climate–population model for Atlantic croaker (Micropogonias undulatus). The model is based on a mechanistic hypothesis: recruitment is determined by temperature-driven, overwinter mortality of juveniles in their estuarine habitats. Temperature forecasts were obtained from 14 general circulation models simulating three CO2 emission scenarios. An ensemble-based approach was used in which a multimodel average was calculated for a given CO2 emission scenario to forecast the response of the population. The coupled model indicates th...
Kevin Leleu - One of the best experts on this subject based on the ideXlab platform.
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metiers effort and catches of a mediterranean small scale Coastal Fishery the case of the cote bleue marine park
Fisheries Research, 2014Co-Authors: Kevin Leleu, Dominique Pelletier, Eric Charbonnel, Yves Letourneur, Frederique Alban, Frederic Bachet, Charles F BoudouresqueAbstract:Abstract The overexploitation of Fishery resources has led to a major fisheries crisis. In this context, artisanal fisheries, and in particular small-scale Coastal fisheries, appear as relevant alternatives for a sustainable use of Coastal resources. Marine Protected Areas (MPA) are more and more used as management tools for these fisheries, as protection effects and targeted access regulations may benefit to commercial fishers. Managers and scientists need then quantitative information not only to adapt their management to the fishing activity present on their territory, but also to estimate the effects of MPA management on it. This study provides catch and effort estimates that are essential for appraising and managing the artisanal Fishery in the Cote Bleue Marine Park (CBMP), a French Mediterranean MPA including two No-Take Zones of different age and size. A field protocol was defined and implemented between July 2009 and June 2010 within the CBMP. Seven metiers were identified and characterized by target species, gear type, fishing grounds and fishing periods. During the one-year studied period, 3512 fishing trips and 4645 fishing operations were performed by 30 active boats in the Cote Bleue fishing territory, amounting to 9500 km of immersed nets. In total, approximately 130 tons of catch were landed in the six CBMP harbors, out of which 58% depend on the three main species caught on the Cote Bleue: hake ( Merluccius merluccius ), gilthead seabream ( Sparus aurata ) and common sole ( Solea solea ). The presented methodology could be part of a long term monitoring requiring close collaboration with local fishers. It enables adaptive management with respect to changes in fishing pressure (from inside and outside the MPA) that may impact the environment and its resources.
Jean-christophe Pereau - One of the best experts on this subject based on the ideXlab platform.
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A Bio-Economic Model for the Viable Managementof the Coastal Fishery in French Guyana
2020Co-Authors: Abdoul Cisse, Fabian Blanchard, Luc Doyen, Jean-christophe Pereau, Sophie Gourguet, O. GuyaderAbstract:The Coastal Fishery in French Guyana is a challenging case study for the implementation of the ecosystem based Fishery management. Although the current situation of this small scale Fishery could be considered as satisfactory, the viability of the Fishery can be questioned. Indeed according to demographic scenarios, the growth of the population will generate an increase of local food demand and therefore growing fishing pressures. Moreover, there is no direct regulation for limiting the fishing catches. Models and quantitative methods to tackle this sustainability issue are still lacking for such mall-scale fisheries mainly because of the various complexities underlying the systems including the heterogeneity of the production factors, the weak selectivity of fleets and high fish biodiversity levels. In the present paper, we both use numerical simulations and a viability perspective to deal with such a problem. We first build a multispecies multi-fleets dynamic model relying on thirteen exploited species and four types of fleets. It accounts for potential trophic interactions, fishing effort and the corresponding costs and revenues. The model was fit on data collected since 2006 by Ifremer: daily production and efforts data, as well as economic data from a survey on the production costs and selling prices in 2009.The co-viability of the system under different scenarios of fishing efforts is studied through ecological and economic performances. The biological viability constraints focus on biodiversity index as species richness or trophic index while economic viability constraints intend to guarantee profitability to all the fleets.
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a bio economic model for the ecosystem based management of the Coastal Fishery in french guiana
Environment and Development Economics, 2013Co-Authors: Abdoul Cisse, Fabian Blanchard, Luc Doyen, Sophie Gourguet, Jean-christophe PereauAbstract:This paper offers a theoretical and empirical model of ecosystem-based Fishery management. A multi-species and multi-fleet model integrating Lotka–Volterra trophic dynamics as well as production and profit assessments is developed and applied to the Coastal Fishery of French Guiana. This small-scale Fishery constitutes a challenging example with high fish biodiversity, several non-selective fleets and a potentially increasing local food demand due to demographic growth. The dynamic model is calibrated with 13 species and four fleets using monthly catch and effort data from 2006 to 2009. Several contrasted fishing scenarios including status quo, total closure, economic and viable strategies are then simulated. They are compared from the viewpoints of both biodiversity preservation and socioeconomic performance, assuming fixed landing prices and fixed costs. We show that fishing outputs, including food supply and fleet profitability, can be sustained on average but a loss of species cannot be avoided.
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Stochastic viability of the Coastal Fishery in French Guiana
2013Co-Authors: Abdoul Cisse, Fabian Blanchard, Luc Doyen, Jean-christophe PereauAbstract:This paper presents an application of stochastic viability approach in a tropical small scale Fishery context, offering a theoretical and empirical model of ecosystem-based Fishery management. A multi-species and multi-fleet bio-economic model integrating Lotka-Volterra trophic dynamics as well as production and profit assessments is applied to the French Guiana Coastal Fishery. This case study is interesting as consistent time series data are available with data collection system set up since 2006. The dynamic model is calibrated with thirteen species and four fleets using monthly catch and effort data from 2006 to 2010. We compare different management strategies relying on different combinations of fishing effort, from the viewpoints of both biodiversity preservation and socio-economic performance, assuming fixed landing prices and fixed costs. The risk for the Fishery to mismatch the potential local fish demand growth is pointed out, as well as the loss of species which cannot be avoided without closure.
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a bio economic model for the ecosystem based management of the Coastal Fishery in french guiana
Cahiers du GREThA, 2011Co-Authors: Abdoul Cisse, Fabian Blanchard, Luc Doyen, Sophie Gourguet, Jean-christophe PereauAbstract:This paper offers a theoretical and empirical modeling for ecosystem-based Fishery management (EBFM). A multi-species and multi-fleets model integrating Lokta-Volterra trophic dynamics and profit functions is developed for the Coastal Fishery of French Guiana. This small-case Fishery constitutes a challenging example with high fish biodiversity, several non selective fleets and a potentially increasing local food demand due to demographic pressure. The dynamic model is calibrated with thirteen species and four fleets using catch and effort data on a monthly basis from 2006 to 2009. Several contrasting fishing scenarios including status quo, total closure, economic and viable strategies are simulated and compared from both biodiversity preservation and socio-economic performance viewpoints. We show that fishing outputs including food supply and profitability of fleets can be sustained although a significant loss of biodiversity cannot be avoided.