@article{ ISI:000208409700006,
Author = {Hillary, R. M. and Edwards, C. T. T. and Mitchell, R. E. and Agnew, D.
   J.},
Title = {{LENGTH-BASED ASSESSMENT FOR MACKEREL ICEFISH (CHAMPSOCEPHALUS GUNNARI)
   AT SOUTH GEORGIA}},
Journal = {{CCAMLR SCIENCE}},
Year = {{2010}},
Volume = {{17}},
Pages = {{129-137}},
Abstract = {{The current CCAMLR assessment method for mackerel icefish
   (Champsocephalus gunnari) in Subarea 48.3 employs the CCAMLR mixture
   analysis program (CMIX) and generalised yield model (GYM) packages,
   which derives population numbers-at-age and projects these numbers
   forward under the given harvest control rule to set a two-year total
   allowable catch (TAC). One issue is the accurate identification of age
   cohorts from the survey data. In this paper a length-based approach is
   described that removes the problem of cohort determination. A bootstrap
   technique (consistent with the current CCAMLR approach) is used to
   estimate the length distribution of the population from the survey data
   which, in conjunction with the bootstrapped survey biomass data, yields
   an estimate of the population numbers-at-length. A comparison of this
   method and the existing age-based CMIX/GYM methodology showed very good
   agreement in calculated yields for 2006, 2007 and 2009, and some
   differences for 2008 which were explained by an unusual length
   distribution from which it was difficult to reliably estimate age
   composition in CMIX. Using the 2009 survey data and the new methodology,
   a TAC was calculated according to the CCAMLR decision rules of 1 577 and
   933 tonnes for the 2009/10 and 2010/11 fishing seasons respectively. The
   respective estimates using the existing CMIX/GYM methodology were 1 590
   and 968 tonnes respectively.}},
Publisher = {{C C A M L R TI}},
Address = {{PO BOX 213, NORTH HOBART, TAS 7002, AUSTRALIA}},
Type = {{Article}},
Language = {{English}},
Affiliation = {{Hillary, RM (Reprint Author), CSIRO Marine \& Atmospher Res, Castray Esplanade, Hobart, Tas 7001, Australia.
   Hillary, R. M.; Edwards, C. T. T., Univ London Imperial Coll Sci Technol \& Med, Div Biol, Fisheries Grp, Ascot SL5 7PY, Berks, England.
   Edwards, C. T. T.; Mitchell, R. E.; Agnew, D. J., MRAG Ltd, London W1J 5PN, England.}},
ISSN = {{1023-4063}},
Keywords = {{mackerel icefish; length-based assessment; CCAMLR}},
Research-Areas = {{Fisheries}},
Web-of-Science-Categories  = {{Fisheries}},
Author-Email = {{rich.hillary@csiro.au}},
ResearcherID-Numbers = {{Hillary, Richard/L-3300-2013}},
Number-of-Cited-References = {{12}},
Times-Cited = {{3}},
Usage-Count-Last-180-days = {{0}},
Usage-Count-Since-2013 = {{3}},
Journal-ISO = {{CCAMLR Sci.}},
Doc-Delivery-Number = {{V24KQ}},
Unique-ID = {{ISI:000208409700006}},
OA = {{No}},
DA = {{2017-08-17}},
}

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One issue is the accurate identification of age cohorts from the survey data. In this paper a length-based approach is described that removes the problem of cohort determination. A bootstrap technique (consistent with the current CCAMLR approach) is used to estimate the length distribution of the population from the survey data which, in conjunction with the bootstrapped survey biomass data, yields an estimate of the population numbers-at-length. A comparison of this method and the existing age-based CMIX/GYM methodology showed very good agreement in calculated yields for 2006, 2007 and 2009, and some differences for 2008 which were explained by an unusual length distribution from which it was difficult to reliably estimate age composition in CMIX. Using the 2009 survey data and the new methodology, a TAC was calculated according to the CCAMLR decision rules of 1 577 and 933 tonnes for the 2009/10 and 2010/11 fishing seasons respectively. 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E. and Agnew, D.\n J.},\nTitle = {{LENGTH-BASED ASSESSMENT FOR MACKEREL ICEFISH (CHAMPSOCEPHALUS GUNNARI)\n AT SOUTH GEORGIA}},\nJournal = {{CCAMLR SCIENCE}},\nYear = {{2010}},\nVolume = {{17}},\nPages = {{129-137}},\nAbstract = {{The current CCAMLR assessment method for mackerel icefish\n (Champsocephalus gunnari) in Subarea 48.3 employs the CCAMLR mixture\n analysis program (CMIX) and generalised yield model (GYM) packages,\n which derives population numbers-at-age and projects these numbers\n forward under the given harvest control rule to set a two-year total\n allowable catch (TAC). One issue is the accurate identification of age\n cohorts from the survey data. In this paper a length-based approach is\n described that removes the problem of cohort determination. A bootstrap\n technique (consistent with the current CCAMLR approach) is used to\n estimate the length distribution of the population from the survey data\n which, in conjunction with the bootstrapped survey biomass data, yields\n an estimate of the population numbers-at-length. A comparison of this\n method and the existing age-based CMIX/GYM methodology showed very good\n agreement in calculated yields for 2006, 2007 and 2009, and some\n differences for 2008 which were explained by an unusual length\n distribution from which it was difficult to reliably estimate age\n composition in CMIX. Using the 2009 survey data and the new methodology,\n a TAC was calculated according to the CCAMLR decision rules of 1 577 and\n 933 tonnes for the 2009/10 and 2010/11 fishing seasons respectively. 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