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  • Feasibility of supplementary sampling of the commercial groundfish landings in Oregon using seafood plant workers

    Creator:
    Builder, Tonya L.
    Abstract:
    Fishery dependent data--length distributions, sex ratios, maturity schedules, and species composition of landed catches--are necessary for stock assessments. These data are currently collected by state port biologists using a sampling design that randomly selects samples from a small percentage of a very large target population. Sampling programs may need to...
    Resource Type:
    Masters Thesis
    Full Text:
    uncertainty in U.S. West Coast stock assessments (NMFS Stock Assessment Team et al., 1998; Rogers et at

  • Evaluating the data-poor fishery stock assessment method, DB-SRA

    Creator:
    Owashi, Brandon R.
    Abstract:
    Depletion-Based Stock Reduction Analysis (DB-SRA; Dick and MacCall, 2011) is a catch-only fisheries stock assessment model that has been developed to estimate an overfishing limit (OFL) in data-poor situations. DB-SRA projects the biomass trajectories of a stock by means of a catch time series and five parameters: the instantaneous, per...
    Resource Type:
    Masters Thesis
    Full Text:
    data-poor fishery stock assessment method, DB-SRA Abstract approved

  • Viability of Transboundary Fisheries and International Quota Sharing

    Creator:
    Curtin, Richard and Martinet, Vincent
    Abstract:
    This paper examines the viability of the management of a transboundary resource, the Bay of Biscay anchovy (Engraulis encrasicolus L.). A deterministic model is used to simulate the anchovy dynamics, with the fish stock consisting of two age groups, “young" and “old", while recruitment follows a Beverton Holt pattern. Two...
    Resource Type:
    Research Paper
    Full Text:
    dynamics, with the fish stock consisting of two age groups, “young" and “old", while recruitment follows

  • Can A 'Feasible' Rent Collector Earn His Hire?

    Creator:
    Murray, Jason
    Abstract:
    Price instruments are rarely seen in fisheries despite their many desirable properties. In this paper, I find new reasons to favor price instruments in a fishery. Given constraints on information and enforcement precluding the optimum optimorum, I consider a second-best but welfare improving policy when catch limits cannot be enforced...
    Resource Type:
    Other
    Full Text:
    Mangrove variability. The 'feasible' tax exploits spatial variation in fish stock productivity as a

  • Statistical model selection criteria and their application to the Stock Synthesis assessment program

    Creator:
    Helu, Siosaia Langitoto
    Abstract:
    Statistical modeling has evolved around building increasingly more complex models, even though it is common knowledge among statisticians that an optimal model size usually exists for any given data set. Having overly complex models leads to imprecise parameter estimates and tends to increase the subjective role of the modeler, which...
    Resource Type:
    Masters Thesis
    Full Text:
    the Stock Synthesis assessment program AN ABSTRACT OF THE THESIS OF Siosaia Langitoto He lu for

  • Sensitivity of the stock synthesis assessment model : a simulation approach

    Creator:
    Yin, Yanshui
    Abstract:
    Stock assessments for many U.S. Pacific coast groundfish stocks are developed using the catch-at-age method known as Stock Synthesis. In this work a simulation package was developed and used to evaluate the sensitivity of the Stock Synthesis program. More specifically, the evaluation focused on the impacts of input data errors...
    Resource Type:
    Dissertation
    Full Text:
    Stock Synthesis Assessment Model: a Simulation Approach. Abstract approved: David B. Sampson Stock

  • North-East Arctic Cod Model

    Creator:
    Ekerhovd, Nils-Arne
    Abstract:
    The international council for the exploration of the seas (ICES) publish annual reports on fish stock assessments. Based on the stock assessment data for the North-East Arctic cod we estimate the effective fishing mortality, establishing coefficients for the catchability-at-age and the annual fishing effort. The fishing effort estimates are then...
    Resource Type:
    Other
    Full Text:
    ) publish annual reports on fish stock assessments. Based on the stock assessment data for the North-East

  • Resource Assessment Surveys As the Basis for Effective Fisheries Management

    Creator:
    Shallard, Bruce, Al-Oufi, Hamed Said, and Bose, Shekar
    Abstract:
    This paper discusses the use of resource assessment surveys as the basis for effective fisheries management drawing on the resource assessment survey of the Arabian Sea coast of Oman. This survey, completed in 2009, has been undertaken in the context of the primary aim of the Oman Ministry of Fisheries...
    Resource Type:
    Research Paper
    Full Text:
    Oman for ongoing stock assessment of Omani fisheries, to guide development and investment decisions

  • Age Structure Metrics for Precautionary Management: Can Simpler Assessment Techniques Save Fish, Time, and Money?

    Creator:
    Cusack, Christopher, Harte, Michael, Sylvia, Gil, Larkin, Sherry, and Heppell, Selina
    Abstract:
    Stock assessment techniques currently used in the United States are extremely costly to implement, involve significant data requirements, and are inaccessible to all but a few stock assessment scientists. A systematic decrease in fishery yields and the designation of several species as overfished on the west coast of the United...
    Resource Type:
    Research Paper
    Full Text:
    @oregonstate.edu ABSTRACT Stock assessment techniques currently used in the United States are extremely

  • Length-based fish stock assessment in Senegal

    Creator:
    Mason, Steve
    Abstract:
    Global Graduates/Oregon International Internship Program offered an internship position working in Senegal with the Institut Senegalais de Recherches Agricoles (ISRA) and the Natural Resource Based Agricultural Research (NRBAR). The author of this paper was accepted for this internship and lived and worked in Senegal from October 1 through December 15,...
    Resource Type:
    Capstone Project
    Full Text:
    Length-based Fish Stock Assessment in Senegal by Steve Mason