Resultados de la búsqueda
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Age-at-length of Patagonian toothfish from the Falkland/Malvinas Islands
Abstract: To provide an age-length key for use in modelling the age structure of the Patagonian ... toothfish stock around the Falkland Islands, we used otoliths to estimate the age of a sample of 1893 ... crenellations. Two readers undertook one reading each of the sections, estimating age using criteria agreed at ... the CCAMLR Otolith Network. Age estimates by the experienced reader were unbiased relative to ...
Meeting Document : WG-FSA-02/74 : Autor(es): J. Ashford, A. Arkhipkin, C. Jones and S. Bobko
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SPATIAL DISTRIBUTION AND AGE STRUCTURE OF THE ANTARCTIC TOOTHFISH (DISSOSTICHUS MAWSONI) IN THE ROSS SEA, ANTARCTICA
. These processes have created diverse habitat, including distinct banks and basins. For many fish species ... toothfish (Dissostichus mawsoni) are subject to an increasingly important commercial fishery in the Ross Sea ... and yet little is known about habitat associations for different life history stages. To define and ... assess the availability of habitat for Antarctic toothfish a benthic habitat map of the Ross Sea was ...
Meeting Document : WG-FSA-08/18 : Autor(es): C.M. Brooks and J.R. Ashford (USA)
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Age-at-length of Patagonian toothfish from South Georgia
Abstract: To provide an age-length key for use in modelling the age structure of the Patagonian ... given by the CCAMLR Otolith Network for toothfish from South Georgia. Age estimates during the first two ... for males; for females, L8 = 144.9, K = 0.085 and t0 =-2.0. Using these age data, we estimated total ... toothfish stock around South Georgia, we used otoliths to estimate the age of a sample of 264 Patagonian ...
Meeting Document : WG-FSA-02/75 : Autor(es): J. Ashford, M. Belchier, C. Jones and S. Bobko
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Towards a validation of ageing in mackerel icefish (Champsocephalus gunnari) – can we estimate age more accurately?
Abstract: Age estimates of mackerel icefish from different laboratories obtained during a CCAMLR ... older than 3 or 4 years were aged. These differences could not be reconciled at the end of the exchange ... . A second age determination workshop on mackerel icefish to improve the accuracy of age determination ... briefly summarizes the state of knowledge on age determination in mackerel icefish and assesses the ...
Meeting Document : WG-FSA-05/23 : Autor(es): K.-H. Kock (Germany) and Zh.A. Frolkina (Russia)
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Length-at-age juvenile Patagonian toothfish Dissostichus eleginoides
Abstract: The fishery for Patagonian toothfish is one of the most valuable in the CCAMLR Area ... . Age based models are used to assess the status of the stocks of this species. Although age can be ... estimated using otoliths it has proven difficult for these to be validated. During a recent trawl survey the ... length density of juvenile toothfish in the catches had a clearly defined polymodal distribution. The age ...
Meeting Document : WG-FSA-01/16 : Autor(es): J. Ashford (USA), I. Everson (UK), C. Jones and S. Bobko (USA)
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A system-of-equations approach to modeling age structured fish populations: the case of Alaskan red king crab, Paralithodes camtschaticus
Abstract: This paper presents a simultaneous system-of-equations approach to modeling age ... -structured populations using trawl survey age/size frequency data. The analysis builds upon a Ricker spawner ... properties of a delay-difference model. The framework shares a common spawner-recruit function across age ... -class equations. This exploits the commonality among cohort members and serves as an instrumental ...
Meeting Document : WS-CRAB-93/23 : Autor(es): J.A. Greenberg, S.C. Matulich and R.C. Mittelhammer (USA)
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Preliminary results of age determination by otolith mass in mackerel icefish Champsocephalus gunnari Lonnberg 1905 in the Heard Island area (Australia)
(1-e-0.5149(1+0.05225)) On this basis the size-age key for this season has been estimated. Author(s ... Abstract: To determine mackerel icefish Champsocephalus gunnari age, otolith mass was used. The ... PROFESSOR MESYATSEV to heard Island shelf area. The otoliths were weighted with an electric balance to ... analysis method. Five age groups were defined. Bertalanffi linear growth equation was calculated: Lt=41.73 ...
Meeting Document : WG-FSA-94/08 : Autor(es): I.B. Russelo (Ukraine)
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Summary of holdings of Patagonian toothfish (Dissostichus eleginoides) otoliths and size-at-age estimates from Heard and McDonald Islands (Division 58.5.2)
currently used in the assessment to predict growth and assign length-at-age to catch-at age, however an ... season age-length keys for these fisheries impossible. It is likely that sufficient otoliths have been ... has yielded data which has assisted with understanding age structure and growth rates of toothfish in ... individuals which have been processed by the Central Ageing Facility to provide size-at-age estimates. Over ...
Meeting Document : WG-FSA-07/45 : Autor(es): D.C. Welsford and G.B. Nowara (Australia)
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LENGTH AND AGE AT SPAWNING OF ANTARCTIC TOOTHFISH DISSOSTICHUS MAWSONI IN THE ROSS SEA
Abstract: This study uses a histological assessment of age and length at spawning for female and ... that primary endogenous growth can occur for an extended period with oocytes accumulating at the ... remnants of previous spawning) yielded similar results. The age at 50% spawning for females on the Ross Sea ... slope with the age distribution in the northern area and the lack of evidence for skip spawning in the ...
Meeting Document : WG-FSA-09/37 : Autor(es): S.J. Parker and P.J. Grimes (New Zealand)
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Robust characterisation of the age structure, growth and recruitment of toothfish in the Macquarie Island and Heard Island and McDonald Islands fisheries
catch at age data remains a high priority for toothfish fisheries. A costing breakdown for otolith ... these fisheries. The inclusion of catch at age data is shown to substantially improve the precision of ... in developing an ageing program. Author(s): D.C. Welsford, S.G. Candy, J.J. Verdouw and J.J ... . Hutchins Title: Robust characterisation of the age structure, growth and recruitment of toothfish in the ...
Meeting Document : WG-FSA-12/P07 : Autor(es): D.C. Welsford, S.G. Candy, J.J. Verdouw and J.J. Hutchins