Search results
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Effect of orientation on broadband acoustic scattering of Antarctic krill Euphausia superba: implications for inverting zooplankton spectral acoustic signatures for angle of orientation
orientation on echo spectral structure. A novel video analysis technique, applied to extract krill angle of ... echo spectra had a more erratic structure, with several closely spaced nulls of variable depth. The ... very similar to theoretically predicted patterns based on a distorted wave Born approximation (DWBA ... acoustic returns for angle of orientation by applying a newly developed Co variance Mean Variance ...
Meeting Document : WG-EMM-99/41 : Author(s): L.V. Martin Traykovski (USA), R.L. O’Driscoll (New Zealand) and D.E. McGehee (USA)
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BEACH DEBRIS SURVEY – MAIN BAY, BIRD ISLAND, SOUTH GEORGIA 2006/2007
Island, South Georgia (covering the period 1 October 2006 to 30 September 2007) a total of 365 items were ... collected. This represents a reduction by 33% on the 544 items recorded in 2005/06 and a decrease in mass of ... clearly identified as being the end of a multifilament line where a hook would have been attached. Five ...
Meeting Document : WG-FSA-08/24 : Author(s): F. Le Bouard (UK)
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Diet composition of Champsocephalus gunnari in Subarea 48.3, Dr Eduardo Holmberg survey, February/ March 1994
the coefficient Q (%) showed a greater importance of T. gaudichaudii with respect to krill. It is ... possible that the inconsistencies found between the results obtained by both methods are due to a ... summer season; a fact that might be related with a significant change in surface temperature observed ... during the cruise. Author(s): E. Barrera-Oro, R. Casaux and A. Roux (Argentina) Title: Diet composition ...
Meeting Document : WG-FSA-94/27 : Author(s): E. Barrera-Oro, R. Casaux and A. Roux (Argentina)
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Results of trials undertaken around Crozet Island using pots to target Patagonian toothfish
Abstract: Patagonian toothfish (Dissostichus eleginoides) is the target species of a bottom ... accidental bird mortality. In order to find a solution to these issues a 25-day pot trial cruise was ... conducted on board vessel Austral Leader II from January 22nd to February 17th 2010 with a period of ... in fishing efficiency and in their by catch. Crab by-catch was identified as a major issue which ...
Meeting Document : WG-FSA-10/10 : Author(s): N. Gasco, P. Tixier and C. Guinet (France)
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Connectivity and population structure in Pleuragramma antarcticum along the west Antarctic Peninsula
simulations using a circulation model. Differences in length distributions and maturity suggested two discrete ... Marguerite Bay, with no mixing between. The presence of a single length mode at Charcot Island and Marguerite ... Bay corresponding to the year class found during GLOBEC 2001 suggested a dominant cohort and no local ... , without similar collapses to the north and south, suggest a third population in the central WAP. Analyses ...
Meeting Document : WG-FSA-10/16 : Author(s): J. Ashford, J. Ferguson, A. Piñones, J. Torres and W. Fraser
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LENGTH-BASED ASSESSMENT FOR MACKEREL ICEFISH (CHAMPSOCEPHALUS GUNNARI) IN SUB-AREA 48.3
projects these numbers forward under the given harvest control rule to set a two‐year TAC. One issue is the ... accurate identification of age cohorts from the survey data. In this paper we describe a length‐based ... approach that removes the problem of cohort determination. A stratified bootstrap technique (consistent ... the population numbers‐at‐length. A comparison of this method and the existing age‐based CMIX/GYM ...
Meeting Document : WG-FSA-09/27 : Author(s): R.M. Hillary (Australia), C.T.T. Edwards, R.E. Mitchel and D.J. Agnew (United Kingdom)
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Population assessment of Patagonian toothfish in Subarea 48.4
Subarea 48.4. The Subarea is divided into two management regions and assessed using a CASAL assessment of ... D. eleginoides in the northern region and a simple Petersen biomass estimate derived for D ... has been retained although a small number of changes have been made to try to improve the fit of the ... model and to reduce the dependency on a relatively small amount of data. These changes comprise the ...
Meeting Document : WG-FSA-12/36 : Author(s): R. Scott (United Kingdom)
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Aspects of the ecology of the bigeye grenadier at South Georgia
estimates suggest that M. holotrachys is a long lived and moderately slow growing species, reaching ages of ... , an average number for a macrourid of this size. A highly skewed sex ratio of 33:1 females: males was ... suggested that females are far more susceptible to longline capture than males. M. holotrachys is a bentho ... - pelagic predator/scavenger that feeds on a wide range of fish and invertebrates. Author(s): S.A. Morley ...
Meeting Document : WG-FSA-03/16 : Author(s): S.A. Morley, T. Mulvey, J. Dickson and M. Belchier (United Kingdom)
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Results of E.L. Holmberg 1995 fish survey in Subarea 48.3
aggregation of stations in a nested ANOVA model. An increase over last year's values was observed in the ... within the historical limits except for a the possible presence of a large eddy in the northern part of ... survey for krill which covered a total of 800 nautical miles in the South Georgia shelf has shown the ... ., Madirolas, A., Balestrini, C., Tossonotto, G., Gonzalez, B., Calcagno, J. Title: Results of E.L. Holmberg ...
Meeting Document : WG-FSA-95/35 : Author(s): Marschoff, E., Madirolas, A., Balestrini, C., Tossonotto, G., Gonzalez, B., Calcagno, J.
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THE SELECTION OF TRIPS BASED ON DATA METRICS FOR THE ASSESSMENT OF ANTARCTIC TOOTHFISH IN THE ROSS SEA
Abstract: A dataset for the 2009 assessment of Antarctic toothfish (Dissostichus mawsoni) in the ... released tags, and/or where tags released on the trip were subsequently recaptured at a high rate. These ... trips were used to define a range for various data quality metrics considered to be informative with ... recovery or where released tags were recaptured at a high rate, the majority of the catches, tag releases ...
Meeting Document : WG-FSA-09/35 : Author(s): D.A.J. Middleton (New Zealand)