Résultats de la recherche

1. A comparison between the estimated density of krill from an acoustic survey with that obtained by scientific nets on the same survey

   ., Higginbottom, I., Hosie, G., de la Mare, W.K., Nicol, S. Title:  A comparison between the estimated density of ... part of a hydroacoustic biomass survey for Antarctic krill in CCAMLR Division 58.4.1. The acoustic ...

   Meeting Document : WG-EMM-97/43 : Auteur(s): Pauly, T., Higginbottom, I., Hosie, G., de la Mare, W.K., Nicol, S.

2. A proposed management procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity

   Paper Title:  A proposed management procedure for the toothfish (Dissostichus eleginoides ... abundance. A Management Procedure (MP) approach is proposed to provide a sound scientific basis to recommend ... ‘Optimistic’, ‘Intermediate’, ‘Less Pessimistic’ and a ‘Pessimistic’ current status for the resource are ... are used for trials of a candidate generic MP which could provide future TAC recommendations for this ... científica sólida para recomendar la captura total permisible (TAC) en el futuro, habida cuenta de esta ... aumento de la tasa de captura, cualquiera que sea el estado actual del stock. Los resultados de la MP son ... que el seguimiento futuro de los datos de la captura por tallas sería necesario, para prevenir un ... . Resumen El estado de los stocks de austromerluza en la región de las Islas Príncipe Eduardo no se conoce ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 33–69 : Auteur(s): Brandão, A. and D.S. Butterworth

3. A generalised model for evaluating yield and the long term status of fish stocks under conditions of uncertainty

   regime is introduced. Author(s):  de la Mare, W.K., Constable, A.J. Title:  A generalised model for ... Abstract:  This paper presents a flexible structure for a general yield model, which provides ... fishing on the estimates of yield per recruit. Also, it can be used to evaluate the performance of a stock ... under a specified catch regime. The model uses an adaptive Runge-Kutta procedure to evaluate stock ...

   Meeting Document : WG-FSA-95/41 : Auteur(s): de la Mare, W.K., Constable, A.J.

4. A balanced model of the food web of the Ross Sea, Antarctica

   Paper Title:  A balanced model of the food web of the Ross Sea, Antarctica Abstract / Description ... :  A quantitative food web of the Ross Sea is presented here as a step towards investigating ecosystem ... base. A survey of the available literature and both published and unpublished data provided an initial ... , and a method is described to adjust the initial parameter set to give a balanced model, taking into ... principales componentes de la biota del Mar de Ross y pone a prueba la coherencia de los datos. El modelo ... ) para cada grupo del modelo. Asimismo, se estimó el nivel relativo de incertidumbre de dichos ... 1.7%, y de 0.6% para las porciones de la dieta. El balance de ciertos componentes del modelo requirió ... parámetros. Los parámetros del conjunto inicial no concordaban, y se describe un método para ajustarlo y ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 1–31 : Auteur(s): Pinkerton, M.H., J.M. Bradford-Grieve and S.M. Hanchet

5. Towards a new method for age determination in Antarctic krill, and evidence that krill shrink under natural conditions

   . Author(s):  W. de la Mare (Australia) Title:  Towards a new method for age determination in Antarctic ... summer show an apparent linear relationship between crystalline cone number and body-length. From a ... be a more reliable indicator of age than body-length alone. The ratio of crystalline cone number to ... body-length offers a method for detecting the effect of shrinking in natural populations of krill. On ...

   Meeting Document : WG-Krill-94/17 : Auteur(s): W. de la Mare (Australia)

6. A von Bertalanffy growth model for toothfish at Heard Island fitted to length-at-age data and compared to observed growth from mark–recapture studies

   Paper Title:  A von Bertalanffy growth model for toothfish at Heard Island fitted to length-at-age ... using a von Bertalanffy (VB) growth model taking into account response-biased sampling of fish that were ... used length-bin sampling involving a fixed sample size per bin. Estimation of the VB parameters used a ... selectivity alone. This was due to the feature of the selectivity function of a sharp decline from ‘full ... parámetros estimados con el método IWLS. Asimismo, se proporciona un ajuste para los peces de menor edad ... (MLP) para el muestreo VP y defi niendo las probabilidades relativas de los intervalos de tallas ... crecimiento de VB. Las fórmulas desarrolladas para ajustar el sesgo de los valores pronosticados por el ... modelo Fabens demostraron que éste es relativamente pequeño para el rango de tallas de los datos sobre ...

   Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 43–66 : Auteur(s): Candy, S.G., A.J. Constable, T. Lamb and R. Williams

7. A first step towards modelling the krill–predator dynamics of the Antarctic ecosystem

   Paper Title:  A first step towards modelling the krill–predator dynamics of the Antarctic ... hypothesis of a krill surplus in the mid-20th century is described, and the information on population and ... population trends without the need for recourse to environmental change hypotheses. A model is developed ... former. A reference case and six sensitivities are fitted to available data on predator abundances and ... , destacándose el papel fundamental del recurso kril. Se describen los fundamentos de la hipótesis de que a ... Austral muestran los mayores cambios en la abundancia de las especies, en contraste con el sector del ... sector en el pasado. Se ajustó un caso de referencia y seis sensibilidades a los datos disponibles ... poblaciones y de las tendencias desde que se postuló esta hipótesis por primera vez. El objetivo de este ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 217–277 : Auteur(s): Mori, M. and D.S. Butterworth

8. A preliminary assessment of age and growth of Antarctic silverfish (Pleuragramma antarcticum) in the Ross Sea, Antarctica

   Paper Title:  A preliminary assessment of age and growth of Antarctic silverfish (Pleuragramma ... antarcticum) were sampled during a trawl survey in the Ross Sea, Antarctica. Biological data, including fish ... -growing with a moderate longevity; the maximum estimated age was 14.3 years. Von Bertalanffy parameters ... were also derived for the sexes separately. Female Antarctic silverfish appear to reach a larger size ... Pleuragramma antarcticum de la región del Estrecho Bransfield, con una comparación cuantitativa con otras ... (DeWitt, 1970; Guglielmo et al., 1998). Consequently, it is a key organism in the fish food web and a ... g ro w th c ur ve p ar am et er s (w ith 9 5% c on fid en ce in te rv al s) f ... al es ; F – fe m al es ; U – u ns ex ed fis h ag ed u p to 5 .3 y ea rs ; A ll ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 75–86 : Auteur(s): Sutton, C.P. and P.L. Horn

9. Bias in the estimation of krill yield from using a deterministic formulation of the median unexploited spawning biomass

   fishing season and spawning season will result in less bias occurring. Author(s):  de la Mare, W.K ... , while the second is a generalised yield model. The decision rules relate to the effects of a specified ... long-term annual yield (γ) on (i) the probability of the spawning stock being reduced below a set ... proportion of SB0 during a projection run (probability of critical depletion) and (ii) the median status of ...

   Meeting Document : WG-EMM-97/45 : Auteur(s): de la Mare, W.K., Constable, A.J.

10. Independent reviews of CCAMLR stock assessments – a discussion paper

    Abstract:  In 2013 the Commission endorsed the Scientific Committee’s recommendation to develop a ... understand that the Scientific Committee will be discussing possible avenues to achieve this goal. We believe ... on this topic and supporting the Scientific Committee in their development of a procedure ... as a mechanism for transparency of the stock assessment process, particularly if reports of such ...

    Meeting Document : SC-CAMLR-XXXV/BG/20 : Auteur(s): Delegation of the USA

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