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    Analysis and comparison of age-structured assessment models for two Pacific herring populations

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    Hulson_P_2007.pdf
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    Author
    Hulson, Peter-John F.
    Chair
    Quinn, Terrance J. II
    Committee
    Norcross, Brenda L.
    Marty, Gary D.
    Metadata
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    URI
    http://hdl.handle.net/11122/5863
    Abstract
    Substantial research has been devoted to identify causes for decline the of Prince William Sound (PWS) Pacific herring in the early 1990's because of the proximity to the 1989 Exxon Valdez oil spill (EVOS). A potential source for decline has been identified with the isolation of disease in the PWS population. There have been limited investigations of PWS Pacific herring population dynamics related to other stocks in the Gulf of Alaska. The objective of this thesis was to compare observations and age-structured assessment (ASA) model results between PWS and Sitka Sound Pacific herring. Data conflicts were evaluated in the PWS ASA model and indicate that hypotheses about natural mortality in the four years subsequent to EVOS depend on the type and weighting of population indices. In Sitka, the ASA model was used to show that time-dependent natural mortality can be estimated. Comparison between PWS and Sitka indicated that age structure and recruitment have been comparable, but abundance indices and weight-at-age data have not been similar after 1993. The differences identified in this thesis between PWS and Sitka imply uniqueness in natural mortality and condition within each Pacific herring population.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2007
    Table of Contents
    General introduction -- 1. Data conflicts in fishery models : incorporating hydroacoustic data into the Prince William Sound Pacific herring assessment model -- 2. Time-dependent parameters in fishery models : natural mortality, gear selectivity, and maturity of Pacific herring (Clupea pallasi) in Sitka Sound, Alaska -- 3. Holistic comparison of historical data and age-structured assessment (ASA) models for Prince William Sound (PWS) and Sitka Sound Pacific herring -- General summary and conclusions.
    Date
    2007-12
    Type
    Thesis
    Collections
    Fisheries

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