Resultados de la búsqueda
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Direct ageing of Antarctic krill (Euphausia superba) – potential utility of eyestalk sections for age determination
Abstract: We outline a method for the direct determination of age in Antarctic krill (Euphausia ... performed. First, longitudinal sections of the eyestalk from known age krill (2+ and 3+ years old) were ... seasons. Marks consistent with annuli observed in laboratory raised krill were observed. Length at age ... development of age-based assessments of krill necessary for management. Further because the annular bands ...
Meeting Document : WG-EMM-15/45 : Autor(es): C. Reiss (USA), R. Kilada (Canada) and S. Kawaguchi (Australia)
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Age-length key for Champsocephalus gunnari from Subarea 48.3, Dr Eduardo Holmberg survey, February/March 1994
Abstract: An age-length key was prepared for Champsocephalus gunnari from the Subarea 48.3, based ... Rocks, a large concentration of fish belonging to age groups 2 (90%) and 3 (10%) was found. The length ... and, the mean lengths of age groups 1-2. Such correspondence was also obtained for age group 3 when ... , E. Marschoff and R. Casaux (Argentina) Title: Age-length key for Champsocephalus gunnari from ...
Meeting Document : WG-FSA-94/11 : Autor(es): E. Barrera-Oro, E. Marschoff and R. Casaux (Argentina)
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Methods of age determination for mackerel icefish (Champsocephalus gunnari Lönnberg 1905) from the South Georgia Island shelf
age assessments of fish longer than 30 cm having an enlarged otolith centre. An age/length key for the ... Paper Title: Methods of age determination for mackerel icefish (Champsocephalus gunnari Lönnberg ... taken in the period July to September. The latter was done using specimens from strictly defined age ... third quarter of the year was also calculated. File: 04-Frolkina.pdf ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 37–49 : Autor(es): Frolkina, Zh.A.
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Estimation of natural mortality using catch-at-age and aged mark-recapture data: a simulation study comparing estimation for a model based on the Baranov equations versus a new mortality equation
the age-structured population for each fishing year by annual recursive use of difference equations ... . An alternative estimation strategy was tested using simulation whereby catch-at-age and aged mark ... -recapture data were generated for 12 years of fishing. Two alternative estimation models were programmed in ... R. Both use the same Poisson likelihood for annual number of recaptures by age class, and both model ...
Meeting Document : WG-SAM-10/11 Rev. 1 : Autor(es): S.G. Candy (Australia)
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Comparison of estimators of effective sample size for catch-at-age and catch-at-length data using simulated data from the Dirichlet-multinomial Distribution
stocks. An appropriate and accurate estimate of the ESS for catch frequency data for each fishery and ... parameter. This last method generally gave the best estimator of an ESS that is appropriate for haul-level ... fishing year is therefore important for such assessments and this issue is studied using simulation ... one of the year-level methods gave reduced estimates of ESS. An appropriate distributional model that ...
Meeting Document : WG-SAM-07/7 : Autor(es): S.G. Candy (Australia)
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Estimation of natural mortality for the Patagonian toothfish at Heard and McDonald Islands using catch-at-age and aged mark-recapture data from the main trawl ground
were obtained using proportions-at-length and fishery and year specific age length keys (ALKs) for ... . An alternative strategy was adopted whereby the catch-at-age and mark-recapture data were restricted ... releases and recaptures of tagged fish were available. Catch and releases by age class for this fishery ... programmed in R, based on alternative ordinary differential equations (ODE) for within-year population ...
Meeting Document : WG-FSA-10/41 : Autor(es): S. Candy, D. Welsford, T. Lamb, J. Verdouw and J. Hutchins (Australia)
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Age-structured production model for toothfish at South Georgia
was fitted for all years, the change to the new selectivity function improved the fit to length ... model. Revisions to the selectivity model this year have led to an ASPM with superior performance ... decaying function of age, with three easily interpretable parameters. When only a single selectivity curve ... selectivity parameters allowed to be estimated on an annual basis the fits are substantially improved. However ...
Meeting Document : WG-FSA-SAM-05/18 : Autor(es): A. Payne, G.P. Kirkwood, R. Hillary and D.J. Agnew (United Kingdom)
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Comparison of age- and length-based harvest control rules for the South Georgia icefish (Champsocephalus gunnari) fishery
age vector for the population. An age-based harvest control rule was then applied using the operating ... Abstract: An age-based operating model was constructed and used to derive an initial numbers at ... (United Kingdom) Title: Comparison of age- and length-based harvest control rules for the South Georgia ... model dynamics and assuming perfect knowledge of the resource (initial numbers at age, maturity and ...
Meeting Document : WG-SAM-10/12 : Autor(es): C.T.T. Edwards, R.M. Hillary, R.E. Mitchell and D.J. Agnew (United Kingdom)
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A von Bertalanffy growth model for Division 58.5.2 fitted to length-at-age data and a comparison of predicted with observed growth from mark–recapture data
Abstract: Length-at-age data for the Patagonian toothfish (Dissostichus eleginoides) caught by ... weighted least squares (IWLS) substantially under-predicted mean length-at-age for older ages compared to ... -age for young fish. Author(s): S.G. Candy, A.J. Constable, T. Lamb and R. Williams (Australia) Title ... : A von Bertalanffy growth model for Division 58.5.2 fitted to length-at-age data and a comparison of ...
Meeting Document : WG-FSA-SAM-06/07 : Autor(es): S.G. Candy, A.J. Constable, T. Lamb and R. Williams (Australia)
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DEVELOPMENT OF SPATIALLY EXPLICIT AGE-STRUCTURED POPULATION DYNAMICS OPERATING MODELS FOR ANTARCTIC TOOTHFISH IN THE ROSS SEA
program allows implementation of an aggregate movement model for use with large numbers of areas as a ... OF SPATIALLY EXPLICIT AGE-STRUCTURED POPULATION DYNAMICS OPERATING MODELS FOR ANTARCTIC TOOTHFISH IN ... Abstract: We present developments towards spatially explicit age-structured population dynamics ... operating models for Antarctic toothfish in the Ross Sea. The operating models consider both a coarse-scale ...
Meeting Document : WG-SAM-09/18 : Autor(es): A. Dunn, S. Rasmussen and S. Hanchet (New Zealand)