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Commission pour la conservation de la faune et la flore marines de l'Antarctique

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  1. Analysis of variability of krill size and fish by-catch in Japanese krill fishery based on scientific observer data

    Abstract:  To estimate optimal relative sample size of scientific observer data collected on ... –2008 were analysed by using a hierarchical Bayesian model. The models were composed of multistage ... -temporal variability in size structure of krill population, which is presumably derived from large ... variability of recruitment causing difficulty in predicting krill population dynamics. Variances of observer ...

    Meeting Document : WG-EMM-12/68 : Auteur(s): T. Okuda and M. Kiyota (Japan)

  2. Direct ageing of Antarctic krill (Euphausia superba) – potential utility of eyestalk sections for age determination

    Abstract:  We outline a method for the direct determination of age in Antarctic krill (Euphausia ... endocuticle layer of the eyestalks and gastric mill in decapod crustaceans. Here we report on a preliminary ... proof of concept study using several known age krill grown under controlled conditions at the Australian ... performed. First, longitudinal sections of the eyestalk from known age krill (2+ and 3+ years old) were ...

    Meeting Document : WG-EMM-15/45 : Auteur(s): C. Reiss (USA), R. Kilada (Canada) and S. Kawaguchi (Australia)

  3. Mitigation of Macrourus by-catch in research block 58.4.1_6 and estimation of Macrourus biomass and sustainable catch in Divisions 58.4.1 and 58.4.2

    ) avoidance, ii) mitigation and iii) the setting of sustainable by-catch limits if mortality is not ... preventable (SC-CAMLR-XXII, paragraph 5.230). Here, we undertake a risk assessment of the effects of ... block 58.4.1_6 in particular. We investigate the distribution of D. mawsoni and Macrourus spp. catch ... grid includes only areas of low Macrourus spp. by-catch rates, or (2) replace the requirement for ...

    Meeting Document : WG-FSA-17/23 : Auteur(s): D. Maschette, P. Burch, P. Yates and P. Ziegler

  4. Changing status of three notothenioid fish at the South Shetland Islands (1983–2016) after impacts of the 1970–80s commercial fishery

    prevalence of three species, Notothenia rossii, Gobionotothen gibberifrons and N otothenia coriiceps in ... 2007 and 2012 around the South Shetland Islands: (1) continued increase in the  abundance of N. rossii ... ; (2) further decline in G. gibberifrons recruitment evidenced by low proportions of juvenile fish; and ... (3) a high abundance of N. coriiceps. Reasons for lack of recovery in G. gibberifrons remain obscure ...

    Meeting Document : WG-FSA-17/P01 : Auteur(s): E. Barrera-Oro, E. Marschoff and D. Ainley

  5. Cycles of Euphausia superba recruitment evident in the diet of Pygoscelid penguins and net trawls in the South Shetland Islands, Antarctica

    Abstract:  Size and sex of Antarctic krill taken from chinstrap and gentoo penguin diet were ... sustaining the population during each cycle. Penguin diet samples contained adult krill of similar lengths to ... proportionately more females when the krill population was dominated by large adults at the end of the cycles; net ... samples showed greater proportions of males in these years. These patterns are comparable to those ...

    Meeting Document : WG-EMM-07/P2 : Auteur(s): A. Miller and W. Trivelpiece (USA)

  6. Analysis of krill trawling positions north of the South Shetland Islands (Antarctic Peninsula area), 1980/81–1999/2000

    Abstract:  Inter- and intra-annual variability of commercial krill trawling positions for the 1980 ... /81 to 1999/2000 seasons in the area to the north of South Shetland Islands were analyzed in relation ... the shelf across to the outer shelf in the early to late 1990’s. Intra-annual variation of trawling ... the season. Trawling positions seemed to be primarily governed by the distribution of larger mature ...

    Meeting Document : WG-EMM-01/35 : Auteur(s): S. Kawaguchi and K. Segawa

  7. Distribution, biological characteristics and biomass of mackerel icefish based on the results of the trawling survey carried out at RV Atlantida in February 2000

    Abstract:  The results of mackerel icefish (Champsocephalus gunnari) trawling survey carried out ... C.gunnari were feeding. In all parts of the Subarea, except the North-Western one, C. gunnari of 22-28 cm in ... coefficient. The objective evidences are submitted to prove that a certain part of C.gunnari stock may stay in ... . Arrangement of regular trawling-acoustic surveys in the area may improve the accuracy of this important ...

    Meeting Document : WG-FSA-00/51 : Auteur(s): Zh.A. Frolkina and P.S. Gasiukov (Russia)

  8. 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 ... properties of a delay-difference model. The framework shares a common spawner-recruit function across age ... variable, lessening the effect of measurement errors in estimation. The dynamic features of the underlying ... effect of measurement error and improve overall estimation efficiency. A seemingly unrelated regression ...

    Meeting Document : WS-CRAB-93/23 : Auteur(s): J.A. Greenberg, S.C. Matulich and R.C. Mittelhammer (USA)

  9. A simulation study of the method of refining the natural mortality coefficient with Champsocephalus gunnari in Subarea 48.3 used as an example

    Abstract:  The method of refining the natural mortality coefficient is based on the notion that ... the free component of the regression equation between the mean-weighted coefficient of natural ... . As a result of this mathematical modelling study using C. gunnari in Area 48.3 as an example, it was ... shown that the proposed method facilitates such a refinement. When a mistake is made in the choice of ...

    Meeting Document : WG-FSA-91/25 : Auteur(s): P.S. Gasiukov and R.S. Dorovskikh (USSR)

  10. Review of Dissostichus spp. fishery in the adjacent seas of three Antarctic sectors in 2003–2010

    of the Antarctic toothfish is commercially viable not only for countries which are close to the ... the Pacific and Indian sectors of the Antarctic. According to lack of data on the Antarctic toothfish ... estimation of toothfish stock and TAC values in all high-latitude Antarctic seas is necessary. From data ... available we suggest that factual stock values of the Antarctic toothfish are considerably underestimated in ...

    Meeting Document : WG-FSA-13/14 : Auteur(s): A.F. Petrov (Russia)

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