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• 1. [Article] Towards Behavioural Models of Fleet Dynamics

  Considerable attention has been applied to the development of models explaining how fish stocks change over space and time, from relatively simple stock-recruitment relationships to ecosystem models with ...

  Citation × Citation Citation Abstract Copy Title: Towards Behavioural Models of Fleet Dynamics Author: Hamon, Katell G., Kulmala, Soile, Thébaud, Olivier, Van Putten, Ingrid, Hutton, Trevor, Dowling, Natalie, Pascoe, Sean Considerable attention has been applied to the development of models explaining how fish stocks change over space and time, from relatively simple stock-recruitment relationships to ecosystem models with a complex food web structure. However, in many case studies fishing effort is assumed to be exogenous and even in dynamic models pre-determined by external factors such as management. An increasing number of operational bio-economic models for the marine environment are including a fleet dynamics component, recognising that fishers respond to changing environmental and economic conditions. These models are based on different assumptions about behaviour. In this review, we examine models of fisher behaviour that are empirically or theoretically developed and tested. In particular, we focus on the range of different economic and social drivers and their relevance to different types of behaviour. We find that economic factors are a dominant driver included in many types of short term behavioural models, although we acknowledge and find that other social factors play a significant role in some types of behaviour. The link between management and economic impacts is reasonably well established, and most bioeconomic models are able to incorporate these feedback systems. Incorporating these other social-dependent behaviours into bioeconomic models, however, is likely to remain a challenge unless links between management and changes in the social drivers are developed. Title: Towards Behavioural Models of Fleet Dynamics Author: Hamon, Katell G., Kulmala, Soile, Thébaud, Olivier, Van Putten, Ingrid, Hutton, Trevor, Dowling, Natalie, Pascoe, Sean Considerable attention has been applied to the development of models explaining how fish stocks change over space and time, from relatively simple stock-recruitment relationships to ecosystem models with a complex food web structure. However, in many case studies fishing effort is assumed to be exogenous and even in dynamic models pre-determined by external factors such as management. An increasing number of operational bio-economic models for the marine environment are including a fleet dynamics component, recognising that fishers respond to changing environmental and economic conditions. These models are based on different assumptions about behaviour. In this review, we examine models of fisher behaviour that are empirically or theoretically developed and tested. In particular, we focus on the range of different economic and social drivers and their relevance to different types of behaviour. We find that economic factors are a dominant driver included in many types of short term behavioural models, although we acknowledge and find that other social factors play a significant role in some types of behaviour. The link between management and economic impacts is reasonably well established, and most bioeconomic models are able to incorporate these feedback systems. Incorporating these other social-dependent behaviours into bioeconomic models, however, is likely to remain a challenge unless links between management and changes in the social drivers are developed. Close

• 2. [Article] Ecosystem-Wide Impacts of Alternative Bycatch Reduction Strategies: An Ecological-Economic Assessment of the Australian Southern and Eastern Scalefish and Shark Fishery

  A concern for the consequences of bycatch and discards in fisheries has led to the implementation of new policies and fisheries management plans aimed at their reduction in many fisheries around the world. ...

  Citation × Citation Citation Abstract Copy Title: Ecosystem-Wide Impacts of Alternative Bycatch Reduction Strategies: An Ecological-Economic Assessment of the Australian Southern and Eastern Scalefish and Shark Fishery Author: Kulmala, Soile, Fulton, Beth, Thébaud, Olivier, Hutton, Trevor, Pascoe, Sean A concern for the consequences of bycatch and discards in fisheries has led to the implementation of new policies and fisheries management plans aimed at their reduction in many fisheries around the world. Such plans have been developed for the Australian Commonwealth fisheries (the most recent bycatch action plan extends from 2009 to 2011 for this case study). These plans list a wide variety of species, including both commercial fish and non-commercial species, particularly those listed as threatened, endangered or protected. The paper presents an analysis of the potential economic and ecological impacts of alternative approaches to the implementation of these plans, with particular emphasis on the use of economic incentives. The analysis is centered on the Australian Commonwealth Southern and Eastern Scalefish and Shark Fishery, and is based on the Atlantis simulation model developed within CSIRO. Atlantis is a spatially explicit model with subcomponents that model the coupled physical transport-biogeochemical processes as elements of the ecosystem, as well as sub-models to include the fisheries, the annual assessments, and the implementation of management regulations and compliance. A feature of the Atlantis model is that it incorporates a fleet dynamics model that allows the main fleets to adjust their fishing behavior in response to incentives. Incentive-based bycatch management scenarios such as the use of deemed values within the existing trade-able quota scheme for over-quota landings, or the imposition of a tax on catches of threatened, endangered and protected species, are considered (as well as tradable bycatch quotas). The consequences of these scenarios are presented in terms of both ecological and economic impacts, with a focus on the ecosystem-wide implications of alternative regulations. Title: Ecosystem-Wide Impacts of Alternative Bycatch Reduction Strategies: An Ecological-Economic Assessment of the Australian Southern and Eastern Scalefish and Shark Fishery Author: Kulmala, Soile, Fulton, Beth, Thébaud, Olivier, Hutton, Trevor, Pascoe, Sean A concern for the consequences of bycatch and discards in fisheries has led to the implementation of new policies and fisheries management plans aimed at their reduction in many fisheries around the world. Such plans have been developed for the Australian Commonwealth fisheries (the most recent bycatch action plan extends from 2009 to 2011 for this case study). These plans list a wide variety of species, including both commercial fish and non-commercial species, particularly those listed as threatened, endangered or protected. The paper presents an analysis of the potential economic and ecological impacts of alternative approaches to the implementation of these plans, with particular emphasis on the use of economic incentives. The analysis is centered on the Australian Commonwealth Southern and Eastern Scalefish and Shark Fishery, and is based on the Atlantis simulation model developed within CSIRO. Atlantis is a spatially explicit model with subcomponents that model the coupled physical transport-biogeochemical processes as elements of the ecosystem, as well as sub-models to include the fisheries, the annual assessments, and the implementation of management regulations and compliance. A feature of the Atlantis model is that it incorporates a fleet dynamics model that allows the main fleets to adjust their fishing behavior in response to incentives. Incentive-based bycatch management scenarios such as the use of deemed values within the existing trade-able quota scheme for over-quota landings, or the imposition of a tax on catches of threatened, endangered and protected species, are considered (as well as tradable bycatch quotas). The consequences of these scenarios are presented in terms of both ecological and economic impacts, with a focus on the ecosystem-wide implications of alternative regulations. Close