Search results
-
Detecting trends in the krill fishery
Abstract: The development of the krill fishery can be monitored and predicted using a number of ... found that they are generally less accurate than will be necessary to detect trends in the future ... . Economic information on the krill fishery has been difficult to access in the past but will be necessary to ... interpretation of technological and market data requires specialist skills which would have to be harnessed if ...
Meeting Document : WG-EMM-02/25 : Author(s): S. Nicol and J. Foster (Australia)
-
Variation in echosounder calibration with temperature and some possible implications for acoustic surveys of krill biomass
calibration parameters were to be employed on survey around South Georgia, and no account were taken of the ... differences in gain settings, then integrated 120 kHz echo signals would be under-reported by 2.8 dB, leading ... in turn to an under-estimation of krill biomass by 52.5 %. Every effort should therefore be made to ... are to be conducted. In addition, the implications of temperature variation across a survey area for ...
Meeting Document : WG-EMM-97/52 : Author(s): Watkins, J.L., Woodroffe, P., Brierley, A.S., Goss, C.
-
Standardised CPUE analysis of Antarctic toothfish (Dissostichus mawsoni) fishery in the Ross Sea for the years 1997/98 to 2004/05
addition to extreme ice conditions that limited where lines could be set. None of these factors were ... believed to be important in 2005. Investigation of additional explanatory terms included an index of ice ... cover and an index of vessel crowding. Neither of these terms was found to be significant or explain the ... parameterisation of the variables are likely to be the reasons why neither of these terms were found to be ...
Meeting Document : WG-FSA-05/32 : Author(s): A. Dunn and N.L. Phillips (New Zealand)
-
Proposal to continue the time series of research surveys to monitor abundance of Antarctic toothfish in the southern Ross Sea, 2016–2017
strata carried out from 2012–2015. It is also proposed that the survey be extended to include adult ... basis, it is proposed that these two areas be surveyed in alternate years. Therefore, it is proposed to ... the same as in previous years, and the number of sets will be retained at 45 sets for the core strata ... , and trends in the time series, be presented to WG-FSA for review in 2016 and that a full review be ...
Meeting Document : WG-SAM-15/45 : Author(s): S.M. Hanchet, S.J. Parker, S. Mormede and R.J.C. Currey (New Zealand)
-
Fishing for structure; can we describe normal patterns in toothfish fishing operations using catch and effort data?
values outside normal maximum ranges can be used to target additional error-checking or seek additional ... required to be gaffed aboard and removed from the line. This effect is compounded by fish size and the ... could be derived, are likely to be influenced by multiple variables. Therefore, multivariate analyses ... . We also recommend additional information be included in the data recording forms to improve ...
Meeting Document : WG-FSA-16/36 : Author(s): J.M. Fenaughty and K. Large
-
Scientific contribution to the 2016 review of Conservation Measure 51-07: Part 1 – rationale, method and data for a risk assessment framework for distributing the krill trigger level
land-based predators, of being inadvertently or disproportionally affected by the krill fishery ... land-based predators, of being inadvertently or disproportionally affected by the krill fishery.   ...
Meeting Document : WG-FSA-16/47 Rev. 1 : Author(s): A. Constable (on behalf of the e-group on CM 51-07 WG-EMM review)
-
Using tag-recapture data to estimate catchability of a series of random stratified trawl surveys
fishing selectivity cannot be corrected for given the available data. In the absence of an unbiased ... estimate of survey catchability, we recommend that a non-informative prior with uniform distribution be ... uniform prior should be wide, e.g. 0.1-1.5, since many processes act on catchability at the same time ... which collectively result in an estimate of catchability that can be well below or above 1. Author(s ...
Meeting Document : WG-SAM-15/34 : Author(s): W. de la Mare, P. Ziegler and D. Welsford (Australia)
-
A SIMULATION STUDY TO DETERMINE THE RELATIONSHIP BETWEEN SAMPLING INTENSITY AND PRECISION WHEN ESTIMATING AVAILABILITY FUNCTIONS FOR BREEDING ADÉLIE PENGUIN COLONIES
measurements that allow high resolution temporal availability functions to be estimated, which in turn can be ... consuming and expensive to process, and it is of interest to determine if such data could be subsampled with ... and cannot be recommended. Author(s): J. McKinlay and C. Southwell (Australia) Title: A SIMULATION ...
Meeting Document : WG-EMM-11/12 : Author(s): J. McKinlay and C. Southwell (Australia)
-
PROPOSED APPROACH FOR THE IDENTIFICATION OF IMPORTANT MARINE AREAS FOR CONSERVATION: USING ‘MARXAN’ SOFTWARE TO SUPPORT SYSTEMATIC CONSERVATION PLANNING
(Margules & Pressey, 2000) might be used to identify important areas for conservation of biodiversity in ... that would be required to undertake such an analysis. ‘MARXAN’ software (Ball & Possingham, 2000 ... other environmental characteristics. It is concluded that this methodology could be used to provide ... type of analysis could be used to inform the implementation of a range of actions to conserve marine ...
Meeting Document : WG-EMM-08/49 : Author(s): S.M. Grant, J. Tratalos and P.N. Trathan (United Kingdom)
-
PRELIMINARY ESTIMATION OF PENGUIN BREEDING ABUNDANCE AT SPATIAL-SCALES OF RELEVANCE TO CCAMLR: INCORPORATING UNCERTAINTY IN COUNT DATA
immediate inter-sessional work to be reported to WG-EMM-08. The work to be undertaken included preliminary ... Antarctic data for Adélie penguins. It was recognised that the abundance estimates would not be corrected ... for availability (e.g. nest failure) and hence would to some extent be biased estimates of the ...
Meeting Document : WG-EMM-08/53 : Author(s): H. Lynch, R. Naveen (USA), J. McKinlay, C. Southwell (Australia), P. Trathan (United Kingdom), W. Trivelpiece, S. Trivelpiece (USA) and D. Ramm (CCAMLR Secretariat)