Resultados de la búsqueda

1. The recent decline in recruitment of Gobionotothen gibberifrons in the South Shetland Islands (CCAMLR Subarea 48.1)

   perturbations on a fish stock by recruitment failure as one of them. Data from the 1980’s and 1990’s (1983, 1985 ... , 1986, 1987, 1996 and 1998: Kock, 1986, Kock 1987, Kock, 1998, Jones et al., 1998) demonstrated that ... caused a number of years of very low recruitment around Elephant Island and the lower South Shetland ...

   Meeting Document : WG-FSA-12/20 : Autor(es): K.-H. Kock (Germany) and C.D. Jones (USA)

2. Integrated stock assessment for the Heard Island and the McDonald Islands Patagonian toothfish (Dissostichus eleginoides) fishery (Division 58.5.2)

   -defining the fishery structure was based on a method by Candy et al. (2013) that suggested a simplification ... of a range of alternative fishery structures and model assumptions for year class strength (YCS) on ... 847 tonnes, and SSB status in 2013 ranged from 0.63- 0.69 of B 0. A model scenario that ignored ... indicating that a separation of the trawl sub-fisheries is appropriate. The scenario with estimating a YCS ...

   Meeting Document : WG-FSA-13/24 : Autor(es): P. Ziegler, S. Candy and D. Welsford (Australia)

3. Revised input parameters and implications for the Antarctic toothfish (Dissostichus mawsoni) stock assessment in Subareas 88.1 and 88.2

   Abstract:  In this paper, we address a number of aspects of the model inputs and parameters of the ... of Antarctic toothfish. While tree-regressions suggested strong evidence of a high degree of small ... -scale areal complexity, we were unable to provide a stratification that resulted in improved or ... . Most of these changes did not have a significant impact on the assessment results. We also provide an ...

   Meeting Document : WG-SAM-07/6 : Autor(es): A. Dunn and S.M. Hanchet (New Zealand)

4. 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

5. 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)

6. 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.

7. 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.

8. 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)

9. 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)

10. 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

Páginas