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  • Generalization of Age-Structured Models in Theory and Practice

    Creator:
    Steinshamn, Stein Ivar
    Abstract:
    A generalization of the harvesting functions and the stock updating functions in age-structured bioeconomic models is outlined. Using this generalization everything from completely uniformly distributed fish to extreme schooling is taken care of. The classical Beverton-Holt model comes out as a special case of the generalized model. Both the theoretical...
    Resource Type:
    Research Paper
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    Montpellier Proceedings 1 GENERALIZATION OF AGE-STRUCTURED MODELS IN THEORY AND PRACTICE Stein Ivar

  • Resource Rents in the Norwegian Fisheries

    Creator:
    Hannesson, Rognvaldur and Steinshamn, Stein Ivar
    Abstract:
    Present resource rents in Norway's fisheries were compared for different fleet structures. Alternative values of TACs were assumed, which is consistent with how most fisheries in Norwegian waters are managed. Total allowable catches (TACs) are set on the basis of advice by fisheries biologists where the economics of the industry...
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    Research Paper
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    Author(s): Rognvaldur Hannesson , Stein Ivar Steinshamn Abstract: Present resource rents in

  • Current and Potential Economic Rent in the Namibian Hake Fishery

    Creator:
    Marsden, A. Dale and Sumaila, U. Rashid
    Abstract:
    We estimated the economic rent obtained currently (that is, in 2002) in the Namibian hake fishery and the rent that might potentially be obtainable if the fishery were managed optimally in the sense of economics. We first reviewed previous economic and biological studies. We then used the theory and model...
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    Research Paper
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    , 187–201 Eburon, Delft, the Netherlands. [5] Eide, Arne, Peter Manning, and Stein Ivar Steinshamn

  • Defining Social & Economic Performance Measures for Catch Share Systems in the Northeast U.S.

    Creator:
    Clay, Patricia M., Pinto da Silva, Patricia, and Kitts, Andrew
    Abstract:
    Catch share systems are being encouraged and considered in a variety of United States (U.S.) fisheries. Scientists, policy makers, and stakeholders (including fishermen and non-governmental environmental organizations) have different views about potential social and economic impacts and outcomes of these output- oriented systems. Thus identifying and evaluating impacts over time...
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    Research Paper
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    , Gordon R. Munro, Sean Pascoe, Dale Squires, Stein Ivar Steinshamn, Bruce R. Turris, and Quinn Weninger

  • Viable coalitions in open access

    Creator:
    Doyen, Luc and Pereau, Jean-Christophe
    Abstract:
    This article gives insights on the complex balance between coalitions structure, resource state or dynamics and agents’ heterogeneity to avoid bio-economic collapses. A model bringing together coalition games and a viability approach is proposed to focus on the compatibility between bio-economic constraints and an exploited common stock dynamics. It is...
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    Research Paper
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    & Steinshamn (2004) in presence of users differing with respect to their efficiency in terms of harvest- ing

  • Can We Stabilize Fisheries' Benefits from a Fluctuating Stock? A Bioeconomic Assessment of The Pacific Whiting Fishery

    Creator:
    Ishimura, Gakushi, Huppert, Daniel D., and Punt, Andre E.
    Abstract:
    Pacific whiting (Merluccius productus) is one of the most commercially valuable fish species in the Pacific coast groundfish fishery, experiences extreme variability in annual recruitment. This variability causes fluctuations in stock abundance and subsequent catch and economic benefits. This study develops a stochastic bioeconomic model of the Pacific whiting fishery...
    Resource Type:
    Research Paper
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    ] Steinshamn, Stein I. 1998, Implications of Harvesting Strategies on Population and Profitability in

  • A Model of Fishing Conflicts in Foreign Fisheries

    Creator:
    Wachsman, Yoav
    Abstract:
    Coastal nations can impose conditions of use on foreign fishing firms that operate in their Exclusive Economic Zone. We develop a game-theoretical model in which a fishery owner maximizes the revenue that it collects from firms that operate in its EEZ by charging them a fishing fee. We find that...
    Resource Type:
    Research Paper