Search

Search Results

• 1. [Article] An Empirical Analysis of Portfolio Management as a Tool for Implementing Ecosystem-Based Fishery Management

  presentation

  Citation × Citation Citation Abstract Copy Title: An Empirical Analysis of Portfolio Management as a Tool for Implementing Ecosystem-Based Fishery Management Author: Jin, Di, Hoagland, Porter, DePiper, Geret presentation Title: An Empirical Analysis of Portfolio Management as a Tool for Implementing Ecosystem-Based Fishery Management Author: Jin, Di, Hoagland, Porter, DePiper, Geret presentation Close

• 2. [Article] Optimal Effort Controls for the Multispecies Groundfish Complex in New England

  Research Paper

  Citation × Citation Citation Abstract Copy Title: Optimal Effort Controls for the Multispecies Groundfish Complex in New England Author: Maguire, Jean-Jacques, Holland, Daniel S. Research Paper Title: Optimal Effort Controls for the Multispecies Groundfish Complex in New England Author: Maguire, Jean-Jacques, Holland, Daniel S. Research Paper Close

• 3. [Article] Risk Assessment of the Mediterranean Seabass and Seabream industry in Greece: A Stochastic Simulation Approach Based on insurance Claims

  The Mediterranean finfish aquaculture is strongly represented from the successful industrial development of the mass production of the Mediterranean seabass (Dicentrarchus labrax) and seabream (Spaurus ...

  Citation × Citation Citation Abstract Copy Title: Risk Assessment of the Mediterranean Seabass and Seabream industry in Greece: A Stochastic Simulation Approach Based on insurance Claims Author: Tzovenis, Ioannis, Sorgeloos, Patrick, Viaene, Jacques, Theodorou, John A., Kotsonis, Antonios The Mediterranean finfish aquaculture is strongly represented from the successful industrial development of the mass production of the Mediterranean seabass (Dicentrarchus labrax) and seabream (Spaurus aurata), with Greece as the major producer country, contributing with approximately 57% of the global farmed production of both species. Despite the difficulty to obtain information from the private and public sector about the aquaculture insurance claims, the analysis of insurance data is necessary to develop a risk management strategy of the industry. The aim of the present work is to identify the major risks affecting the seabass/seabream aquaculture by examining qualitative and quantitative insurance claims from the early developmental stage (mid-80s) up to the maturation of the Greek sector (2000). A risk assessment based on scenario quantification and Monte Carlo Simulation with the ZHA WORKS 4.2 QUANT software is used to reveal percentile statistics of 1 Year/Worst out of x Years aggregate loss and thus to "harden" the basis for decision taking. The use of the past insurance experience provides forecasting trends for risk avoidance in the future and contributes to a strategy development for the sustainability of the sector. Title: Risk Assessment of the Mediterranean Seabass and Seabream industry in Greece: A Stochastic Simulation Approach Based on insurance Claims Author: Tzovenis, Ioannis, Sorgeloos, Patrick, Viaene, Jacques, Theodorou, John A., Kotsonis, Antonios The Mediterranean finfish aquaculture is strongly represented from the successful industrial development of the mass production of the Mediterranean seabass (Dicentrarchus labrax) and seabream (Spaurus aurata), with Greece as the major producer country, contributing with approximately 57% of the global farmed production of both species. Despite the difficulty to obtain information from the private and public sector about the aquaculture insurance claims, the analysis of insurance data is necessary to develop a risk management strategy of the industry. The aim of the present work is to identify the major risks affecting the seabass/seabream aquaculture by examining qualitative and quantitative insurance claims from the early developmental stage (mid-80s) up to the maturation of the Greek sector (2000). A risk assessment based on scenario quantification and Monte Carlo Simulation with the ZHA WORKS 4.2 QUANT software is used to reveal percentile statistics of 1 Year/Worst out of x Years aggregate loss and thus to "harden" the basis for decision taking. The use of the past insurance experience provides forecasting trends for risk avoidance in the future and contributes to a strategy development for the sustainability of the sector. Close

• 4. [Article] Presentation of Dogmatis, An Inter and Multidisciplinary Programme for the Assessment of the Impacts of Genetically Modified Fish, and Results About Risk of fortuitous Import on French Market

  Poster session.

  Citation × Citation Citation Abstract Copy Title: Presentation of Dogmatis, An Inter and Multidisciplinary Programme for the Assessment of the Impacts of Genetically Modified Fish, and Results About Risk of fortuitous Import on French Market Author: Mariojouls, Catherine, Ngo, May-Ahn, Sohm, Frédéric, Pucheu, Elodie, Doussan, Isabelle, Mambrini, Muriel, Bertheau, Yves, Coutellec, Léo, Schmid, Anne Françoise, Barrey, Sandrine, Boy, Laurence Poster session. Title: Presentation of Dogmatis, An Inter and Multidisciplinary Programme for the Assessment of the Impacts of Genetically Modified Fish, and Results About Risk of fortuitous Import on French Market Author: Mariojouls, Catherine, Ngo, May-Ahn, Sohm, Frédéric, Pucheu, Elodie, Doussan, Isabelle, Mambrini, Muriel, Bertheau, Yves, Coutellec, Léo, Schmid, Anne Françoise, Barrey, Sandrine, Boy, Laurence Poster session. Close

• 5. [Article] Markets, Pooling and Insurance for Managing Incidental Catch In Fisheries

  Abstract only.

  Citation × Citation Citation Abstract Copy Title: Markets, Pooling and Insurance for Managing Incidental Catch In Fisheries Author: Holland, Dan Abstract only. Title: Markets, Pooling and Insurance for Managing Incidental Catch In Fisheries Author: Holland, Dan Abstract only. Close

• 6. [Article] Discontinuous Sustainable Yield: The Exception or the Rule?

  The sustainable yield function is a favoured tool in fisheries policy making. Normally, this function is drawn as a continuous curve in effort-yield space. This means that sustainable yield (harvest) is ...

  Citation × Citation Citation Abstract Copy Title: Discontinuous Sustainable Yield: The Exception or the Rule? Author: Arnason, Ragnar The sustainable yield function is a favoured tool in fisheries policy making. Normally, this function is drawn as a continuous curve in effort-yield space. This means that sustainable yield (harvest) is gradually reduced to zero as fishing effort increases. This, however, does not have to be the case. The sustainable yield function may easily be discontinuous in the sense that sustained fishing effort beyond a certain critical level will lead to a discrete fall in yield to zero, i.e., a collapse of the fishery. The corresponding sustainable yield curve then has a gap at the critical fishing effort level. Clearly, the existence of such a gap has major implications for fisheries policy. It has long been recognized that depensatory biomass growth generally leads to discontinuous sustainable yield curves. What appears to be less well understood is that with fully compensatory biomass growth, fish schooling (patchy distribution of fish over the fishing grounds) generally leads to the same result. Since schooling behaviour is typical of most species of fish ― only the degree of schooling varies ― discontinuous sustainable yield functions tend to be the rule rather than the exception. This paper considers with these issues. It shows how schooling behaviour leads to discontinuities in the sustainable yield function. It explores the corresponding dynamics of the fish stock and the implications for the risk of stock collapses and fisheries policies designed to avoid them. The paper finally speculates about the impacts of profit maximizing investments by fishing firms on the existence and location of gaps in sustainable yield curves. Title: Discontinuous Sustainable Yield: The Exception or the Rule? Author: Arnason, Ragnar The sustainable yield function is a favoured tool in fisheries policy making. Normally, this function is drawn as a continuous curve in effort-yield space. This means that sustainable yield (harvest) is gradually reduced to zero as fishing effort increases. This, however, does not have to be the case. The sustainable yield function may easily be discontinuous in the sense that sustained fishing effort beyond a certain critical level will lead to a discrete fall in yield to zero, i.e., a collapse of the fishery. The corresponding sustainable yield curve then has a gap at the critical fishing effort level. Clearly, the existence of such a gap has major implications for fisheries policy. It has long been recognized that depensatory biomass growth generally leads to discontinuous sustainable yield curves. What appears to be less well understood is that with fully compensatory biomass growth, fish schooling (patchy distribution of fish over the fishing grounds) generally leads to the same result. Since schooling behaviour is typical of most species of fish ― only the degree of schooling varies ― discontinuous sustainable yield functions tend to be the rule rather than the exception. This paper considers with these issues. It shows how schooling behaviour leads to discontinuities in the sustainable yield function. It explores the corresponding dynamics of the fish stock and the implications for the risk of stock collapses and fisheries policies designed to avoid them. The paper finally speculates about the impacts of profit maximizing investments by fishing firms on the existence and location of gaps in sustainable yield curves. Close

• 7. [Article] A Multivariate Poisson Approach to Estimating Target Catch and Bycatch Production

  Abstract only.

  Citation × Citation Citation Abstract Copy Title: A Multivariate Poisson Approach to Estimating Target Catch and Bycatch Production Author: Stohs, Stephen, Hilger, James Abstract only. Title: A Multivariate Poisson Approach to Estimating Target Catch and Bycatch Production Author: Stohs, Stephen, Hilger, James Abstract only. Close

• 8. [Article] Aquaculture and Food Security - Can Fish Farming Fill the Gap?

  While aquaculture has provided economic and nutritional benefits to millions, there are concerns that unconstrained sector expansion and intensification, coupled with its ecological and social impacts, ...

  Citation × Citation Citation Abstract Copy Title: Aquaculture and Food Security - Can Fish Farming Fill the Gap? Author: Troell, Max While aquaculture has provided economic and nutritional benefits to millions, there are concerns that unconstrained sector expansion and intensification, coupled with its ecological and social impacts, globalization of markets, and climate change, may have undesirable impacts on the resilience of social-ecological systems. A significant part of the aquaculture expansion is expected to occur in coastal areas, where it directly affects resource systems already experiencing large pressure from human activities. Thus, there is a risk that the anticipated benefits from aquaculture may come at the expense of increased pressure on coastal ecosystem services, thus jeopardizing coastal people’s food security and livelihoods. Further, intensification may also indirectly increase the dependence on marine ecosystems through usage of fish resources as feeds. The practice of intensive farming of fish and crustaceans is characterised by inputs of high quality resources and energy and release of effluents. The industry continues to improve performance through research on food development and system designs, and recent initiative, the “Aquaculture dialogue”, attempts to identify sustainability criteria for a selection of cultured species. In addition FAO have recently moved beyond their earlier established “code of conducts” and are now developing a broader systematic perspective on aquaculture, i.e. “Ecosystem approach to aquaculture”. This presentation will discuss how aquaculture may impact on social-ecological resilience, more broadly and also in connection to coastal aquaculture development, and specifically considers the intensification of production methods. In connection to this some recent sustainability tools/indicators will briefly be discussed out from this perspective. Title: Aquaculture and Food Security - Can Fish Farming Fill the Gap? Author: Troell, Max While aquaculture has provided economic and nutritional benefits to millions, there are concerns that unconstrained sector expansion and intensification, coupled with its ecological and social impacts, globalization of markets, and climate change, may have undesirable impacts on the resilience of social-ecological systems. A significant part of the aquaculture expansion is expected to occur in coastal areas, where it directly affects resource systems already experiencing large pressure from human activities. Thus, there is a risk that the anticipated benefits from aquaculture may come at the expense of increased pressure on coastal ecosystem services, thus jeopardizing coastal people’s food security and livelihoods. Further, intensification may also indirectly increase the dependence on marine ecosystems through usage of fish resources as feeds. The practice of intensive farming of fish and crustaceans is characterised by inputs of high quality resources and energy and release of effluents. The industry continues to improve performance through research on food development and system designs, and recent initiative, the “Aquaculture dialogue”, attempts to identify sustainability criteria for a selection of cultured species. In addition FAO have recently moved beyond their earlier established “code of conducts” and are now developing a broader systematic perspective on aquaculture, i.e. “Ecosystem approach to aquaculture”. This presentation will discuss how aquaculture may impact on social-ecological resilience, more broadly and also in connection to coastal aquaculture development, and specifically considers the intensification of production methods. In connection to this some recent sustainability tools/indicators will briefly be discussed out from this perspective. Close

• 9. [Article] Fishery Management When Biological and Economic Disturbances Are Correlated

  Economists studying the management of fisheries have universally assumed disturbances affecting harvest costs are unrelated to disturbances affecting biological growth. This paper gives examples of commercially ...

  Citation × Citation Citation Abstract Copy Title: Fishery Management When Biological and Economic Disturbances Are Correlated Author: Kennedy, Chris J. Economists studying the management of fisheries have universally assumed disturbances affecting harvest costs are unrelated to disturbances affecting biological growth. This paper gives examples of commercially valuable species that are impacted reproductively and behaviorally by a single environmental variable (e.g., temperature), leading to correlated disturbances in current marginal harvest costs and future biological growth. A general analytical model examines the importance of considering correlated disturbances when choosing optimal escapement targets, and shows how the presence of correlation affects the value of waiting for information on harvest costs. These results give insight as to the appropriate use of "self-correcting" mechanisms for controlling harvest, such as landing fees, versus hard targets, and provide a framework for proactive management of fisheries in the face of large-scale marine disturbances that can affect both the biological growth and behavior of commercially valuable species. Title: Fishery Management When Biological and Economic Disturbances Are Correlated Author: Kennedy, Chris J. Economists studying the management of fisheries have universally assumed disturbances affecting harvest costs are unrelated to disturbances affecting biological growth. This paper gives examples of commercially valuable species that are impacted reproductively and behaviorally by a single environmental variable (e.g., temperature), leading to correlated disturbances in current marginal harvest costs and future biological growth. A general analytical model examines the importance of considering correlated disturbances when choosing optimal escapement targets, and shows how the presence of correlation affects the value of waiting for information on harvest costs. These results give insight as to the appropriate use of "self-correcting" mechanisms for controlling harvest, such as landing fees, versus hard targets, and provide a framework for proactive management of fisheries in the face of large-scale marine disturbances that can affect both the biological growth and behavior of commercially valuable species. Close

• 10. [Article] A Stochastic Viability Approach for Ecosystem-Based Management of Mixed Fisheries: The Case of The Bay of Biscay Demersal Fisheries

  Abstract only.

  Citation × Citation Citation Abstract Copy Title: A Stochastic Viability Approach for Ecosystem-Based Management of Mixed Fisheries: The Case of The Bay of Biscay Demersal Fisheries Author: Gourguet, Sophie, Doyen, Luc, Thébaud, Olivier, Macher, Claire, Guyader, Olivier Abstract only. Title: A Stochastic Viability Approach for Ecosystem-Based Management of Mixed Fisheries: The Case of The Bay of Biscay Demersal Fisheries Author: Gourguet, Sophie, Doyen, Luc, Thébaud, Olivier, Macher, Claire, Guyader, Olivier Abstract only. Close