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• 1. [Article] Global Economic and Environmental Changes and Fisheries Viability: the Case of the French Guyana Shrimp Fishery

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  Citation × Citation Citation Abstract Copy Title: Global Economic and Environmental Changes and Fisheries Viability: the Case of the French Guyana Shrimp Fishery Author: Thébaud, Olivier, Chaboud, Christian, Blanchard, Fabian Abstract only. Title: Global Economic and Environmental Changes and Fisheries Viability: the Case of the French Guyana Shrimp Fishery Author: Thébaud, Olivier, Chaboud, Christian, Blanchard, Fabian Abstract only. Close

• 2. [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

• 3. [Article] The triple bottom line: Meeting ecological, economic and social goals with Individual Transferable Quotas

  This paper deals with the sustainable management of a renewable resource based on individual and transferable quotas (ITQs) when agents differ in terms of harvesting costs or catchability. In a dynamic ...

  Citation × Citation Citation Abstract Copy Title: The triple bottom line: Meeting ecological, economic and social goals with Individual Transferable Quotas Author: Little, L. Rich, Thébaud, Olivier, Pereau, Jean-Christophe, Doyen, Luc This paper deals with the sustainable management of a renewable resource based on individual and transferable quotas (ITQs) when agents differ in terms of harvesting costs or catchability. In a dynamic bio-economic model, we determine the conditions under which the manager of an ITQ system can achieve sustainability objectives which simultaneously account for stock renewal, economic efficiency and maintenance of fishing activity for the agents along time. We use the viability approach and more specifically the viability kernel to handle such a feasibility problem. We show that the capacity for the manager to set viable management strategies based on fixing Total Allowable Catch (TAC) limits simultaneously depends on the degree of heterogeneity of users in the fishery, the current value of the stock and its dynamic features. To quantify this, we also compute the maximal number of active (viable) agents for a given set of agents and a given stock. It is shown how this number decreases with heterogeneity of involved agents while it increases with the stock. A numerical example illustrates the whole results. Title: The triple bottom line: Meeting ecological, economic and social goals with Individual Transferable Quotas Author: Little, L. Rich, Thébaud, Olivier, Pereau, Jean-Christophe, Doyen, Luc This paper deals with the sustainable management of a renewable resource based on individual and transferable quotas (ITQs) when agents differ in terms of harvesting costs or catchability. In a dynamic bio-economic model, we determine the conditions under which the manager of an ITQ system can achieve sustainability objectives which simultaneously account for stock renewal, economic efficiency and maintenance of fishing activity for the agents along time. We use the viability approach and more specifically the viability kernel to handle such a feasibility problem. We show that the capacity for the manager to set viable management strategies based on fixing Total Allowable Catch (TAC) limits simultaneously depends on the degree of heterogeneity of users in the fishery, the current value of the stock and its dynamic features. To quantify this, we also compute the maximal number of active (viable) agents for a given set of agents and a given stock. It is shown how this number decreases with heterogeneity of involved agents while it increases with the stock. A numerical example illustrates the whole results. Close

• 4. [Article] The Effect of Quota Trading Limitation in A Fishery Managed Through Individual Transferable Quotas

  Individual transferable quotas (ITQs) have been used in several countries worldwide to regulate access to marine fisheries. While ITQs can improve the economic efficiency of fisheries, in practice they ...

  Citation × Citation Citation Abstract Copy Title: The Effect of Quota Trading Limitation in A Fishery Managed Through Individual Transferable Quotas Author: Little, L. Richard, Hamon, Katell G., Thébaud, Olivier, Frusher, Stewart D. Individual transferable quotas (ITQs) have been used in several countries worldwide to regulate access to marine fisheries. While ITQs can improve the economic efficiency of fisheries, in practice they are not a panacea and distribution and equity issues have been raised in many cases. To overcome those issues, ITQ systems have sometimes been designed with a set of regulations limiting the trade and capping ownership of quota units. In this study, we use an agent-based modelling approach to simulate the effects of introducing ITQs in the Tasmanian rock lobster fishery. Individual agent decisions regarding spatial and temporal fishing distribution are modelled at a monthly level taking into consideration the profitability they derive from fishing rock lobster. A quota trading model is integrated into the fisher decision making process allowing fishers the choice of leasing quota units in or out depending on economic performance and their catch expectations. The model is then used to investigate the consequences of setting a limit on quota trading. Preliminary results are presented on how the different harvesting patterns induced by a cap on trade and concentration of quota impact on the socio-economic performance of the fishery and the biological resource. The initial simulations show that allowing quota trade has been important in reducing capacity in the fishery. Simulations suggest that non tradeable individual quotas would not have led to the observed reduction in the active fleet. The model also allows to simulate the possible trajectory of quota leasing prices over the first decade of the ITQ system, and to assess its sensitiveness to external drivers such as the market crisis observed in the early 2000s. Title: The Effect of Quota Trading Limitation in A Fishery Managed Through Individual Transferable Quotas Author: Little, L. Richard, Hamon, Katell G., Thébaud, Olivier, Frusher, Stewart D. Individual transferable quotas (ITQs) have been used in several countries worldwide to regulate access to marine fisheries. While ITQs can improve the economic efficiency of fisheries, in practice they are not a panacea and distribution and equity issues have been raised in many cases. To overcome those issues, ITQ systems have sometimes been designed with a set of regulations limiting the trade and capping ownership of quota units. In this study, we use an agent-based modelling approach to simulate the effects of introducing ITQs in the Tasmanian rock lobster fishery. Individual agent decisions regarding spatial and temporal fishing distribution are modelled at a monthly level taking into consideration the profitability they derive from fishing rock lobster. A quota trading model is integrated into the fisher decision making process allowing fishers the choice of leasing quota units in or out depending on economic performance and their catch expectations. The model is then used to investigate the consequences of setting a limit on quota trading. Preliminary results are presented on how the different harvesting patterns induced by a cap on trade and concentration of quota impact on the socio-economic performance of the fishery and the biological resource. The initial simulations show that allowing quota trade has been important in reducing capacity in the fishery. Simulations suggest that non tradeable individual quotas would not have led to the observed reduction in the active fleet. The model also allows to simulate the possible trajectory of quota leasing prices over the first decade of the ITQ system, and to assess its sensitiveness to external drivers such as the market crisis observed in the early 2000s. Close