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Growth of mackerel icefish (Champsocephalus gunnari) and age-size composition of populations in subarea of South Georgia
were studied for different periods. The analysis of age composition of icefish in subarea 48.3 showed ... represented by fish of two contiguous age groups. It was shown that in the 1980s during a number of years the ... Abstract: Age, growth rate and age composition of icefish catches in subareas 48.3, 48.2, 48.1 ... that the catches consisted mainly of individuals of 2-4 age groups, where more than 60% were ...
Meeting Document : WG-EMM-03/60 : Autor(es): K.V. Shust and E.N. Kuznetsova (Russia)
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Growth of mackerel icefish (Champsocephalus gunnari) and age-size composition of population in subarea of the South Georgia
were studied for different periods. The analysis of age composition of icefish in subarea 48.3 showed ... represented by fish of two contiguous age groups. It was shown that in the 1980s during a number of years the ... Abstract: Age, growth rate and age composition of icefish catches in subareas 48.3, 48.2, 48.1 ... that the catches consisted mainly of individuals of 2-4 age groups, where more than 60% were ...
Meeting Document : WG-FSA-SAM 03/7 : Autor(es): K.V. Shust and E.N. Kuznetsova (Russia)
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Age and growth of Antarctic Euphausiacea (Crustacea) under natural conditions
Peninsula and the southeastern Weddell Sea. Life spans range from two years for Euphausia frigida to six ... years for the krill Euphausia superba. Growth in length and weight was calculated by non-linear ... eastern Weddell Sea. Former opinions that differ are discussed. Seasonal growth was re-analyzed for the ... spawn at least twice and in some cases three times during their life, except for E. frigida which spawns ...
Meeting Document : SC-CAMLR-VI/BG/24 : Autor(es): V. Siegel (FRG)
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Age determination of Champsocephalus gunnari taken from the South Georgia area in 1990 (available in Russian only)
Author(s): P.N. Kochkin (VNIRO, USSR) Title: Age determination of Champsocephalus gunnari taken ...
Meeting Document : WG-FSA-90/33 : Autor(es): P.N. Kochkin (VNIRO, USSR)
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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)