Resultados de la búsqueda
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Conservation Measure Conservation Measure 41-01 (2004)
el este hasta 30°E, derecho hacia el sur hasta 60°S, derecho hacia el oeste hasta 20°W, derecho hacia el norte ... hasta 60°S. F Desde 60°S 20°E, derecho hacia el este hasta 30°E, derecho hacia el sur hasta la costa ... e Investigación hasta el 31 de agosto de 2005 se presentarán a la CCRVMA antes del 30 de septiembre de 2005 ... detallados de cualquier mortalidad incidental de estos animales. 3. De las pesquerías de palangre ... General measures for exploratory fisheries for Dissostichus spp. in the Convention Area in the ... Subarea 88.1 Subarea 88.2 Species: Dissostichus spp. Limitations: Except for waters adjacent to the ... Kerguelen and Crozet Islands Except for waters adjacent to the Prince Edward Islands Adopted at Meeting ...
Conservation Measure : 41-01 (2004)
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Revised age and growth estimates for Antarctic starry skate (Amblyraja georgiana) from the Ross Sea
Paper Title: Revised age and growth estimates for Antarctic starry skate (Amblyraja georgiana ... georgiana in the Ross Sea suggested that these skates initially grow very rapidly for about five years ... , after which growth almost ceases (Francis and Ó Maolagáin, 2005). An alternative interpretation of age ... been generated that suggest much slower growth, greater ages-at-maturity (about 20 years compared with ... underestimated Estimated age (years) 0 10 20 30 40 P el vi c le ng th (c m ) 0 20 40 60 80 100 ... cessa- tion of growth. They estimated the age-at-sexual- maturity to be 6–7 years for males and 8–11 ... years for females, and their maximum observed age was 14 years. However, no ageing validation study ... an assessment of between-reader variability. The revised age and growth estimates for this species ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 211–220 : Autor(es): Francis, M.P. and M.J. Gallagher
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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.
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 ... new mortality equation. Abstract / Description: An estimation strategy for natural mortality, M ... , using multiple cohorts and multiple years of catch-at-age and aged mark-recapture data was tested using ... time. The initial age structure at the first year of fishing and for subsequent years is obtained by ... ) model) uses an ODE with constant within-year catch per unit time for each age class, and as a result ... of the population size for each age class and year of fishing. Allowing an adequate time for mixing ... = t0, then the starting numbers-at-age for the pop- ulation { }0 0 0,1 ,,...,=t t t AN N N must be ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 1–27 : Autor(es): Candy, S.G.
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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
obtained using proportions-at-length and fishery- and year-specific age–length keys (ALKs) for years 1998 ... trawl ground at HIMI were used to estimate M. Catch and releases by age class for this fishery were ... directly from the estimates of population numbers-at-age. The properties of these two models for estimation ... in R, based on alternative ordinary differential equations (ODE) for within-year population dynamics ... fishery- and year-specific age–length keys (ALKs) for years 1998 to 2008. A large proportion of the ... age frequencies within each fishing year. For an M of 0.155, the expected number of recaptures fitted ... proportions-at-age for the main trawl ground for season 2 (1 May–30 September) and season 3 (1 October–30 ... -age proportions observed and fitted by CASAL for Ground B in (a) season 2 (1 May–30 September) and ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 29–45 : Autor(es): Candy, S.G., D.C. Welsford, T. Lamb, J.J. Verdouw and J.J. Hutchins
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Species identification and age estimation for the ridge-scaled macrourid (Macrourus whitsoni) from the Ross Sea
Paper Title: Species identification and age estimation for the ridge-scaled macrourid (Macrourus ... Zealand for subsequent confirmation of their identity by researchers from the National Institute of Water ... methodology has yet to be validated for this species. Von Bertalanffy growth parameters were calculated from ... , living to at least 50 years. Females grow at a faster rate, and reach a larger size, than males, but both ... 40 50 60 70 80 90 100 0 5 10 15 20 25 30 35 40 45 50 55 60 Age (years) To ta l l en gt h ... . holotrachys Species identifi cation and age estimation for M. whitsoni 44 Marriott et al. 0 10 20 30 ... % 80% 90% 100% 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 ... maturing. 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 12 13 14 15 16 17 18 19 20 21 22 23 24 25 ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 37–51 : Autor(es): Marriott, P., P.L. Horn and P. McMillan
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Estimation of effective sample size for catch-at-age and catch-at-length data using simulated data from the Dirichlet-multinomial distribution
Paper Title: Estimation of effective sample size for catch-at-age and catch-at-length data using ... gave accurate estimators of an ESS that is appropriate for haul-level heterogeneity with increasing ... method. To account for process error in the calculation of the ESS, the lack of fit of the age-structured ... random variation across years in one of the selectivity function parameters and similarly for the ... sampling of the population age structure. For each of the 20 years in a replicate, catch-at- age ... ) effective sample size is given by /n hm . When catch-at-age frequen- cies for a series of years are given ... estimates of yn′ if catch-at-age frequen- cies for a series of years are available. They esti- mate yn ... interaction between years and age for these terms (i.e. linbin x linyr, linbin x quadyr, quadbin x linyr ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 115–138 : Autor(es): Candy, S.G
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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 ... (IWLS), predicted substantially lower mean length-at-age for older ages compared to the VB curve fitted ... -estimated parameters. A young-age adjustment (less than 5 years old) to the VB model is also given in order ... to give more realistic predictions of mean length-at-age for young fish. File: 03candy-etal.pdf ... ed distribution with zero skew, and (ii) an exponential distribution for age- at-fi rst-capture that ... mean length-at-age for ages above 15 years. When length bin relative sampling frequencies were also ... – 20 year range. This translated to larger predictions for the MLPLB-fi tted curve for ages below 5 ... (2007): 43–66 43 A VON BERTALANFFY GROWTH MODEL FOR TOOTHFISH AT HEARD ISLAND FITTED TO LENGTH-AT-AGE ...
Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 43–66 : Autor(es): Candy, S.G., A.J. Constable, T. Lamb and R. Williams
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REVISED AGE AND GROWTH ESTIMATES FOR ANTARCTIC STARRY SKATE, AMBLYRAJA GEORGIANA, FROM THE ROSS SEA
that these skates initially grow very rapidly for about five years, after which growth almost ceases ... (Francis and Ó Maolagáin, 2005). We present an alternative interpretation of age and growth in A. georgiana ... growth, greater ages at maturity (about 20 years compared with 6–11 years) and greater maximum ages (28 ... . Francis (New Zealand) and M.J. Gallagher (Ireland) Title: REVISED AGE AND GROWTH ESTIMATES FOR ANTARCTIC ...
Meeting Document : WG-FSA-08/21 : Autor(es): M.P. Francis (New Zealand) and M.J. Gallagher (Ireland)
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Lead-radium dating provides a framework for coordinating age estimation of Patagonian toothfish (Dissostichus eleginoides) between fishing areas
. 3.3 years was observed across estimated ages younger than 20 years. For the CAF, ages were ... estimates range from approximately 20 to more than 50 years. In this study, lead-radium dating provided ... zones in transverse otolith sections, and longevity estimates exceeding 30 years. Lead-radium dating ... revealed minor biases between the radiometric age and interpretation of growth zone counting for regional ...
Meeting Document : WG-FSA-11/P01 : Autor(es): A.H. Andrews, J.R. Ashford, C.M. Brooks, K. Krusic-Golub, G. Duhamel, M. Belchier, C.C. Lundstrom and G.M. Cailliet
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A comparison between otoliths and scales for use in estimating the age of Dissostichus eleginoides from South Georgia
Paper Title: A comparison between otoliths and scales for use in estimating the age of ... result in large errors in age data for long-lived species, usually due to compression of scale circuli ... otoliths and scales give the same age estimates, and compared the precision of age estimation for both ... Dissostichus eleginoides from South Georgia Abstract / Description: Age composition is fundamental to ... . Sustainable exploitation rates should have been 20-30% of that based on age determinations from scales, in ... suckers grew quickly at ages 4-7 years, few surviving beyond an age of 9 years. Annual mortality was ... using scales than otoliths. There was evidence that for fish older t l~an 16 years (estimated using ... use of otoliths and scales in estimating tootlifish age 0 10 20 30 40 50 10 20 30 40 50 Reader l ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 75–92 : Autor(es): Ashford, J.R., S. Wischniowski, C. Jones, S. Bobko and I. Everson