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1. Uncertainty in standard sphere calibrations

   Abstract:  In fisheries acoustics, the standard sphere method of echosounder calibration is most commonly used (Johannesson and Mitson, 1983; Simmonds et al., 1984). To investigate the uncertainty in the method, a series of experiments were conducted in a deep tank (Demer and Hewitt, 1993). Results

   Meeting Document : WG-EMM-95/70 : Author(s): Demer, D.A., Hewitt, R.P.

2. Acoustic survey design to estimate krill biomass in Subareas 48.1, 48.2 and 48.3

   Abstract:  The Scientific Committee has requested advice on the feasibility of conducting a synoptic survey of krill biomass in Statistical Area 48. Example calculations are presented for estimating the amount of survey effort required to achieve a target level of precision using a stratified

   Meeting Document : WG-EMM-95/71 : Author(s): Hewitt, R.P., Watters, G.

3. Uncertainty in acoustic surveys of Antarctic krill

   Abstract:  Studied were four primary sources of uncertainty in krill density estimates from acoustic surveys. The variance in system calibration with a standard sphere was evaluated in relation to sphere material and diameter, water temperature, and pulse length (Demer and Hewitt, 1992).

   Meeting Document : WG-EMM-95/72 : Author(s): Demer, D.A.

4. A summary of software anomalies encountered with the Simrad EK500 system

   Abstract:  Anomalies detected in the firmware of a Simrad EK500 echo-sounder are described so that users are aware of potential problems and how to solve them. Author(s):  Murray, A.W.A., Watkins, J.L., Goss, C., Brierley, A.S. Title:  A summary of software anomalies encountered with the Simrad

   Meeting Document : WG-EMM-95/73 : Author(s): Murray, A.W.A., Watkins, J.L., Goss, C., Brierley, A.S.

5. An acoustic estimation of krill densities to the north of South Georgia in January 1994

   Abstract:  Dual frequency (38 and 120 kHz) acoustic surveys were carried out in two regions along the northern coast of South Georgia from RRS lames Clark Ross during January 1994. Difference in signal strength between the two frequencies (δMVBS = MVBS 120 kHz- MVBS 38 kHz) was used to discriminate

   Meeting Document : WG-EMM-95/74 : Author(s): Watkins, J.L., Brierley, A.S.

6. A comparison of acoustic targets at South Georgia and the South Orkney Islands during a season of profound krill scarcity

   Abstract:  Dual frequency (38 and 120 kHz) acoustic surveys of shelf-break regions in the vicinity of Willis Islands, South Georgia and Coronation Island, South Orkneys, both in the Atlantic sector of the Southern Ocean, were carried out from RRS lames Clark Ross during January 1994. Difference in

   Meeting Document : WG-EMM-95/75 : Author(s): Watkins, J.L., Brierley, A.S.

7. A comparison of geostatistical and random sample survey analyses of Antarctic krill acoustic data

   Abstract:  Data from the acoustic surveys of MV SA "Aghulas" and FRV "Walter Herwig", and the 1981 RRS "John Biscoe" South Georgia acoustic survey were analyzed by geostatistical methods. Estimates of mean density (g m-2) of krill and their variances are compared with

   Meeting Document : WG-EMM-95/76 : Author(s): Murray, A.W.A.

8. Report of CEMP activities carried out in Cape Shirreff during the Antarctic season 1994/95

   Author(s):  Torres, D. Title:  Report of CEMP activities carried out in Cape Shirreff during the Antarctic season 1994/95 Approval:  Approved

   Meeting Document : WG-EMM-95/77 : Author(s): Torres, D.

9. Variation in the diet of the blue-eyed shag Phalacrocorax atriceps throughout the breeding season at Half-Moon Island, South Shetland Islands

   Abstract:  One hundred and seventy three regurgitated casts of the blue-eyed shag or imperial cormorant Phalacrocorax atriceps were collected in a colony at Half-moon Island, South Shetland Islands, by weekly sampling throughout the breeding season from December 1993 to February 1994. Demersal

   Meeting Document : WG-EMM-95/78 : Author(s): Barrera-Oro, E., Casaux, R.

10. Comparison of the diet of the blue-eyed shag Phalacrocorax atriceps by the analysis of pellets and stomach contents

    Abstract:  A total of 45 pellets from the blue-eyed shag Phalacrocorax atriceps were collected in January 1994 at Duthoit Point, Nelson Island, South Shetland Islands. The analysis showed fish as the main prey, followed by octopods, polychaetes and gastropods. Notothenia coriiceps formed the bulk

    Meeting Document : WG-EMM-95/79 : Author(s): Silva, P., Coria, N., Favero, M., Casaux, R.

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