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Estimation of natural mortality using catch-at-age and aged mark-recapture data: a multi-cohort simulation study comparing estimation for a model based on the Baranov equations versus a new mortality equation.
perturbation by observational error were also carried out for each model in order to investigate the effect on ... selectivity function, the bias and imprecision in estimates of M increased by no more than 2% for the CCODE ... obtained by integrating an ordinary differential equation (ODE) for within-year population dynamics. The ... process error in predicted catch-at-age numbers. Simulations assumed 1 000 releases per year over 12 years ... the age-structured population for each fishing year by ‘tracking’ all cohorts in the population over ... time. The initial age structure at the first year of fishing and for subsequent years is obtained by ... t with the corresponding total catch for year t in age class a given by ( ), / δ δ ¢ ¢= tt a aC c ... selectivity function, the bias and imprecision in estimates of M increased by no more than 2% for the CCODE ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 1–27 : Autor(es): Candy, S.G.
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A first attempt at an assessment of the Patagonian toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands EEZ
eleginoides) resource in the Prince Edward Islands EEZ Abstract / Description: The history of the fishery for ... Patagonian toothfish (Dissostichus eleginoides) in the Prince Edward Islands Exclusive Economic Zone (EEZ) is ... reviewed briefly. It is characterised by very large illegal catches and a sharply declining longline catch ... maximum of about 400 tonnes. Implications for surveillance are discussed. File: 02brandao-etal.pdf ... sensitivity tests are shown in Table 5, together with those for projections to 2010 and to 2020 under a ... Prince Edward Islands EEZ fi shery for toothfi sh by South African operators developed in the face of ... combines these IUU catch estimates with legal catches (for calendar years) by South African operators ... -based) production models in that they allow for the delay between reduction in spawning biomass and ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 11–32 : Autor(es): Brandão, A., D.S. Butterworth, B.P. Watkins and D.G.M. Miller