Research Publications (1998)

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  • 1998 - Exploitation/movements of yellowfin tuna / bigeye tuna tagged in the north-western Coral Sea Tooltip

    Exploitation and movements of yellowfin tuna (Thunnus albacares) and bigeye tuna (T. obesus) tagged in the north-western Coral Sea (John Hampton and John Gunn)

    Yellowfin tuna (Thunnus albacares) and bigeye tuna (T. obesus) were tagged and released in the north-western Coral Sea in 1991 and 1992. Over the next five years, recaptures were reported by Australian longline vessels fishing in the release area, and by industrial tuna fleets fishing in the adjacent western Pacific region, thus demonstrating clear links between the tuna stocks in these areas.

  • 1998 - MULTIFAN-CL : a length-based, aged-structured model for fisheries stock assessment Tooltip

    MULTIFAN-CL : a length-based, aged-structured model for fisheries stock assessment, with application to South Pacific albacore, Thunnus Alalunga (David A. Fournier, John Hampton, and John R. Sibert)

    We introduce a length-based, age-structured model, MULTIFAN-CL, that provides an integrated method of estimating catch age composition, growth parameters, mortality rates, recruitment, and other parameters, from time series of fishery catch, effort, and length frequency data. The method incorporates Bayesian parameter estimation, estimation of confidence intervals for model parameters, and procedures for hypothesis testing to assist model development. We apply the method to South Pacific albacore (Thunnus alalunga) fishery data, and demonstrate the incorporation of model structure such as spatial heterogeneity, age-dependent natural mortality and movement rates, time series trends and seasonal variation in catchability, and density-dependent growth. Consistency of the results of the albacore analysis with various exogenous sets of biological and environmental data give credence to the model results.

  • 1998 - Biology, fisheries and stock assessment of bigeye tuna (Thunnus obesus) in the Pacific ocean Tooltip

    Technical Report No 36: A summary of current information on the biology, fisheries and stock assessement of bigeye tuna (Thunnus obesus) in the Pacific ocean, with recommendations for data requirements and future research (John Hampton, Keith Bigelow and Marc Labelle) 

    The western and central Pacific Ocean (WPO) currently supports the largest industrial tuna fishery in the world, with total annual catches from 1991 to 1994 of approximately 1,000,000 mt. The three gear types accounting for most of the catch in the area are longline, purse seine and pole-and-line. Large-mesh drift-net, handline and trolling gear have been utilised in some areas, but not to the extent of the above-mentioned gear types. The primary target species are skipjack, yellowfin, bigeye and albacore

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