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1. 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 : Автор(ы): J. Ashford, M. Belchier, C. Jones and S. Bobko

2. 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 : Автор(ы): K.-H. Kock (Germany) and Zh.A. Frolkina (Russia)

3. 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 : Автор(ы): J. Ashford (USA), I. Everson (UK), C. Jones and S. Bobko (USA)

4. 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 : Автор(ы): J.A. Greenberg, S.C. Matulich and R.C. Mittelhammer (USA)

5. 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 : Автор(ы): I.B. Russelo (Ukraine)

6. 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 : Автор(ы): D.C. Welsford and G.B. Nowara (Australia)

7. 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 : Автор(ы): S.J. Parker and P.J. Grimes (New Zealand)

8. 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 : Автор(ы): D.C. Welsford, S.G. Candy, J.J. Verdouw and J.J. Hutchins

9. Update of ongoing work on age and growth of Antarctic toothfish (Dissostichus mawsoni) from Division 58.4.1 by Australia and Spain

   -age pair values had been estimated for every season.   An intersessional exchange of 40 “bake and ... and 2017 respectively, in order to get data and biological samples which enable an assessment of ... T. Barnes Title:  Update of ongoing work on age and growth of Antarctic toothfish (Dissostichus ... responsibility for releasing documents:  Spain ...

   Meeting Document : WG-FSA-18/54 Rev. 1 : Автор(ы): L.J. López-Abellán, M.T.G. Santamaría, R. Sarralde, S. Barreiro, B. Farmer and T. Barnes

10. Comparison of age readings by two otolith preparation techniques and readers

    between fish ageing programmes. The criteria for determining similar age interpretation used here (mean ... ” techniques were used to prepare otoliths and each were read by an experienced reader from each program. The ... paired age difference statistically equal to zero, overall CV less than 10%, and slope of regression ... across ages equal to 1) were useful diagnostics in interpreting age comparisons. Author(s):  S.J. Parker ...

    Meeting Document : WG-FSA-14/53 : Автор(ы): S.J. Parker (New Zealand), A.F. Petrov (Russia), C.P. Sutton (New Zealand) and E.N. Kuznetsova (Russia)

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