Resultados de la búsqueda
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Report on exploratory fishing by Australia in Division 58.4.1 during the 2015/16 fishing season
as set out in Conservation Measures 41-11 and 41-05. A research plan (WG-FSA-15/47 Rev. 1) was ... composition, tagging and biological sampling undertaken by Australia in SSRUs 58.4.1E and 58.4.1G. A total of ... logbooks recorded a total of 51980.9 kg of Antarctic toothfish (Dissostichus mawsoni) and 581.6 kg of ... Conservation Measure 41-01. A total of 247 D. mawsoni and 16 D. eleginoides were tagged, and 3 D. mawsoni were ...
Meeting Document : WG-SAM-16/35 : Autor(es): P. Yates, D. Welsford, P. Ziegler, D. Maschette and T. Lamb
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An investigation of integrated stock assessment methods for the Patagonian toothfish (Dissostichus eleginoides) in Division 58.5.2 using CASAL
al. (2006), but with a recognition that some age classes are only partially selected in these surveys ... Patagonian toothfish in Division 58.5.2. It focuses on developing a “base-case” assessment, which is ... the abundances of juvenile fish but adding fishery catch-at-length data, including a standardised ... well as uncertainties in the spatial dynamics of the stock and the fisheries. Author(s): A. Constable ...
Meeting Document : WG-FSA-SAM-06/14 : Autor(es): A. Constable, S. Candy and I. Ball (Australia)
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Uncertainty in echosounder calibrations
standard sphere method (Johannesson and Mitson, 1983; Simmonds et al., 1984). To determine the accuracy of ... deviations of 0.1, 0.3, and 0.2 dB, respectively. To characterize the precision of the method for a fixed ... pulse length (0.3 ms) and water temperature (18.9°C), a Simrad EK500 echosounder was used to measure ... sphere TS versus time. Over two 15 hour periods, the measured TS ranged 1.2 dB for a 23.0 mm Cu sphere ...
Meeting Document : WG-EMM-96/40 : Autor(es): Soule, M.A., Demer, D.A.
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Uncertainty in acoustic surveys of Antarctic krill
acoustic surveys. The variance in system calibration with a standard sphere was evaluated in relation to ... different standard spheres with the results of a calibration by self-reciprocity (Demer and Hewitt ... , submitted). Combining the results of these experiments, the accuracy and precision of a system calibration ... with a standard sphere were estimated as-1.2 dB and ±0.3 dB, respectively. Uncertainty in estimating ...
Meeting Document : WG-EMM-95/72 : Autor(es): Demer, D.A.
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Genetic structuring of Patagonian toothfish populations in the southwest Atlantic Ocean: the effect of the Antarctic Polar Front and deep-water troughs as barriers to genetic exchange
sites. Mitochondrial DNA (mtDNA) data indicated a sharp genetic division between the Patagonian Shelf ... these data indicate that the APF, as a barrier to larval dispersal, is the major inhibitor of genetic ... effects or (putative) male-biased dispersal. Author(s): P.W. Shaw, A.I. Arkhipkin and H. Al-Khairulla ...
Meeting Document : WG-FSA-04/21 : Autor(es): P.W. Shaw, A.I. Arkhipkin and H. Al-Khairulla (United Kingdom)
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Penguins, fur seals, and fishing: prey requirements and potential competition in the South Shetland Islands, Antarctica
their foraging efforts on a single species, Antarctic krill (Euphausia superba). Because these predators ... may have a significant effect on krill abundance, we estimated the energy and prey requirements of ... et al. who asserted that the potential for competition between South Shetland predators and the ...
Meeting Document : WG-EMM-99/57 : Autor(es): D.A. Croll and B.R. Tershy (USA)
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Proposed initiative to contribute to Ross Sea region MPA research and monitoring activities using pop-up satellite tags and otolith chemistry on Dissostichus mawsoni
is to deploy a total 20 pop-off satellite tags (PSAT) on juvenile toothfish within the General ... survey to monitor abundance of Antarctic toothfish in the southern Ross Sea in 2018/19 (Stevens et al ... ., 2018), and a winter longline survey of Antarctic toothfish in the northern region of Subareas 88.1 and ...
Meeting Document : WS-SM-18/16 : Autor(es): C.D. Jones
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An integrated stock assessment for the Heard Island and the McDonald Islands Patagonian toothfish (Dissostichus eleginoides) fishery in Division 58.5.2
parameters, the use of abundance estimates from a random stratified trawl survey (RSTS), longline tag-release ... -SAM-2015, and incorporates (a) new fishery observations up to 2015 including new ageing data from the ... catchability q, unfished spawning biomass B 0 and year class strength, and (e) a split of the trawl sub-fishery ... into two periods. All model runs were conducted with the CASAL version 2.30-2012-03-21 that was agreed ...
Meeting Document : WG-FSA-15/52 : Autor(es): P. Ziegler and D. Welsford (Australia)
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An integrated stock assessment for the Heard Island and McDonald Islands Patagonian toothfish (Dissostichus eleginoides) fishery in Division 58.5.2
, the use of abundance estimates from a random stratified trawl survey (RSTS), longline tag-release data ... , (3) updated maturity parameters, (4) updated tag loss estimates (5) a bias correction for fish ... the CASAL version 2.30-2012-03-21 rev. 4648 that was agreed on by WG-SAM-14. The updated assessment ... model leads to a smaller estimate of the virgin spawning stock biomass B 0 than that obtained in 2015 ...
Meeting Document : WG-FSA-17/19 : Autor(es): P. Ziegler
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Birds: Trophic modelling of the Ross Sea
Description / Abstract: A supporting document to the CCAMLR Science paper: M.H. Pinkerton, J.M ... . Bradford-Grieve and S.M. Hanchet. 2010. A balanced model of the food web of the Ross Sea, Antarctica ... 1993). In a study of chick abundance trends, Barber-Meyer et al. (2008) suggests that the overall ... each year (Ainley et al. 1984), a breeding success of 60%, and juvenile mortality of 1.0 y-1 in the ... (data includes East Crozier) (Taylor et al 1990) compared to 118 000 pairs in 1991, a decrease of 33 ... colonies, and a lack of information on whether these changes are continuing, for the present version of ...
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