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• 1. [Article] International Management Strategies for a Migratory Fish Stock: A Bio-economic Simulation Model of the Norwegian Spring-spawning Herring Fishery

  In this paper, a three-country dynamic bio-economic model is presented and used to simulate catch levels, stock size and profit potential of alternative management strategies for the Norwegian spring-spawning ...

  Citation × Citation Citation Abstract Copy Title: International Management Strategies for a Migratory Fish Stock: A Bio-economic Simulation Model of the Norwegian Spring-spawning Herring Fishery Author: Gordon, Daniel V., Bjorndal, Trond, Lindroos, Marko, Kaitala, Veijo Year: 2001 In this paper, a three-country dynamic bio-economic model is presented and used to simulate catch levels, stock size and profit potential of alternative management strategies for the Norwegian spring-spawning herring fishery. Management of the herring fishery is complicated by the migratory behaviour of the species moving between coastal state zones and the high seas. The biological model is described by a discrete time age structured model and the economic model is described by a rent maximising model with constant price of herring and different costs of harvesting and efficiency levels for the different national fleets. The simulations are carried out over a 70-year period and show that the benefits of international cooperation far exceed the returns of a competitive open access fishery. Title: International Management Strategies for a Migratory Fish Stock: A Bio-economic Simulation Model of the Norwegian Spring-spawning Herring Fishery Author: Gordon, Daniel V., Bjorndal, Trond, Lindroos, Marko, Kaitala, Veijo Year: 2001 In this paper, a three-country dynamic bio-economic model is presented and used to simulate catch levels, stock size and profit potential of alternative management strategies for the Norwegian spring-spawning herring fishery. Management of the herring fishery is complicated by the migratory behaviour of the species moving between coastal state zones and the high seas. The biological model is described by a discrete time age structured model and the economic model is described by a rent maximising model with constant price of herring and different costs of harvesting and efficiency levels for the different national fleets. The simulations are carried out over a 70-year period and show that the benefits of international cooperation far exceed the returns of a competitive open access fishery. Close

• 2. [Article] Optimal Management of Conflicting Species: Grey Seal (Halichoerus grypus) and Atlantic Salmon (Salmo salar) in the Northern Baltic Sea

  In the Baltic Sea, the successful conservation of grey seals has increased seal-induced damages to the Atlantic salmon fishery. The paper addresses the conflict between the conservation of the formerly ...

  Citation × Citation Citation Abstract Copy Title: Optimal Management of Conflicting Species: Grey Seal (Halichoerus grypus) and Atlantic Salmon (Salmo salar) in the Northern Baltic Sea Author: Kulmala, Soile, Lindroos, Marko, Holma, Maija In the Baltic Sea, the successful conservation of grey seals has increased seal-induced damages to the Atlantic salmon fishery. The paper addresses the conflict between the conservation of the formerly endangered species and professional fishermen whose livelihood is also regulated by fisheries management. We develop a bioeconomic model that accounts for the age-structure of Atlantic salmon and grey seal populations. In order to reach a social optimum, we maximize the discounted net present value taking into account the seal-induced losses through a damage function. The socially optimal salmon stock size, salmon catch and fishing effort is studied under different management schemes aimed at mitigating the seal-salmon conflict. The results suggest that technological adaptation would effectively reduce the cause of the conflict, while a technology subsidy encouraging such adaptation shifts the economic responsibility from individual fishermen towards a broader public. Title: Optimal Management of Conflicting Species: Grey Seal (Halichoerus grypus) and Atlantic Salmon (Salmo salar) in the Northern Baltic Sea Author: Kulmala, Soile, Lindroos, Marko, Holma, Maija In the Baltic Sea, the successful conservation of grey seals has increased seal-induced damages to the Atlantic salmon fishery. The paper addresses the conflict between the conservation of the formerly endangered species and professional fishermen whose livelihood is also regulated by fisheries management. We develop a bioeconomic model that accounts for the age-structure of Atlantic salmon and grey seal populations. In order to reach a social optimum, we maximize the discounted net present value taking into account the seal-induced losses through a damage function. The socially optimal salmon stock size, salmon catch and fishing effort is studied under different management schemes aimed at mitigating the seal-salmon conflict. The results suggest that technological adaptation would effectively reduce the cause of the conflict, while a technology subsidy encouraging such adaptation shifts the economic responsibility from individual fishermen towards a broader public. Close

• 3. [Article] Optimal Management of Conflicting Species: Grey Seal (Halichoerus Grypus) and Baltic Salmon (Salmo Salar L.)

  Abstract only.

  Citation × Citation Citation Abstract Copy Title: Optimal Management of Conflicting Species: Grey Seal (Halichoerus Grypus) and Baltic Salmon (Salmo Salar L.) Author: Kulmala, Soile, Lindroos, Marko, Holma, Maija Abstract only. Title: Optimal Management of Conflicting Species: Grey Seal (Halichoerus Grypus) and Baltic Salmon (Salmo Salar L.) Author: Kulmala, Soile, Lindroos, Marko, Holma, Maija Abstract only. Close