Search results
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Report of vulnerable marine ecosystems in South Georgia Islands (CCAMLR Subarea 48.3) through research dredge sampling
Abstract: In this contribution we report the presence of 6 vulnerable marine ecosystems (VME ... Institute of Fishery Research and Development (INIDEP) and the Argentine Antarctic Institute (IAA) during ... April-May of 2013. VMEs were established from the finding of high densities of indicator taxa through a ... the biomass and were primarily responsible of reaching the proposed threshold of 10kg/1200 m 2 but ...
Meeting Document : WG-FSA-13/58 : Author(s): E. Gaitán, L. Schejter, D. Giberto, M. Escolar and C. Bremec (Argentina)
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Adélie penguin breeder abundance in CCAMLR Divisions 58.4.1 and 58.4.2
Adelie penguins were attempting to breed at the time of the surveys in Divisions 58.4.1 and 58.4.2. This ... predators of the Southern Ocean including ice-breeding seals, fur seals, penguins and flying seabirds. The ... other regions around Antarctica under the work program of WG-EMM-STAPP as a basis for management of ... future krill fisheries in those regions. We present here estimates of the breeding Adélie penguin ...
Meeting Document : WG-EMM-13/09 : Author(s): C. Southwell, J. McKinlay, L. Emmerson (Australia), A. Takahashi (Japan), C. Barbraud, K. DeLord and H. Weimerskirch (France)
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Mackerel icefish ecological indices
Atlantic sector of the Southern Ocean they feed preferentially on krill and are themselves preyed upon by ... : Standing Stock, Cohort Strength and Recruitment, Natural Mortality, Length at Age 1+ and 2+ years ...
Meeting Document : WG-EMM-03/42 : Author(s): I. Everson (United Kingdom), K.-H. Kock (Germany) and A.W. North (United Kingdom)
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Guidelines to whale photo-identification from fishing boats derived from experience in Kerguelen (ASD 58.5.1) and Crozet (ASD 58.6)
, camera settings, data checking at sea and the information needed to identify individuals and interactions ... -identification program. This document could be part of the resources provided by CCAMLR on its website. Author ...
Meeting Document : WG-FSA-13/08 : Author(s): N. Gasco, P. Tixier and C. Guinet (France)
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The structure and spatial distribution of Antarctic krill aggregations from acoustic observation in the South Georgia area
parts of South Georgia area. The boundary between two areas is located at about 37°30/ W. It is shown ... Abstract: Results of acoustic surveys carried out in winter months of 2000 and 2002 demonstrate ... significant distinctions in spatial distribution patterns of krill in the northwestern and the northeastern ... that in winter months in the northwestern part where foraging areas of dependent predators are located ...
Meeting Document : WG-EMM-04/66 Rev. 1 : Author(s): S.M. Kasatkina (Russia)
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ESTIMATING THE SWEPT AREA OF DEMERSAL LONGLINES BASED ON IN-SITU VIDEO FOOTAGE
, the section of line visible to the camera swept sideways, interacting with sessile benthic organisms ... before leaving the seafloor. Based on an estimate of the rate of sideways movement, the total time ... sideways movement occurred before the line lifted off the seafloor, the total length of the line and the ... total time to retrieve the line, we estimate that up to 0.122 km2 of seafloor was swept by the line ...
Meeting Document : WG-FSA-08/58 : Author(s): D. Welsford and R. Kilpatrick (Australia)
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Laboratory target strength measurements of free swimming Antarctic krill (Euphausia superba)
Abstract: Target strength measurements of free swimming krill at 120kHz were made using a single ... were calculated indirectly by deconvolution of the cumulative probability function of echo ensembles of ... evaluate the effects of varying the ratio of largest to smallest echo amplitudes for a given ensemble, thus ... enabling the estimation of threshold induced bias in the target strength estimates. The threshold induced ...
Meeting Document : WG-EMM-97/75 : Author(s): Pauly, T., Penrose, J.D.
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Biological acoustic survey in the marginal ice edge zone of the Bellingshausen Sea
Abstract: An acoustic survey at 38 and 120 kHz was carried out from RRS Discovery in the ... Bellingshausen Sea from 23 November to 7 December 1992 as part of the UK Joint Global Ocean Flux Study (JGOFS ... ) Southern Ocean investigations (TuRNER and OWENS, 1995). A total of 285 targets were identified and ... described from the chart record of the echo sounder. Mean Volume Backscattering Strength data were collected ...
Meeting Document : WG-Krill-94/32 : Author(s): A.W.A. Murray, J.L. Watkins and D.G. Bone (United Kingdom)
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A preliminary assessment and revised growth model of mackerel icefish (Champsocephalus gunnari) in Division 58.5.2, based on results from the 2017 random stratified trawl survey
vicinity of Heard Island and the McDonald Islands during April 2017. This paper provides an updated growth ... , abundance and yield in Division 58.5.2 to the west of 79 o 20’ E using standard CCAMLR methods (CMIX and ... growth model based on recent cohort progressions indicated an increase in size-at-age compared to the ... estimates of Welsford (2010), however Generalized Yield Model projections indicated that the updated growth ...
Meeting Document : WG-FSA-17/22 : Author(s): D. Maschette, P. Burch, P. Yates and D. Welsford
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Shedding new light on the life cycle of mackerel icefish in the Southern Ocean
fishing and due to natural causes. Increases in populations of Antarctic fur seals at South Georgia and ... Atlantic and Indian Ocean sectors of the low-Antarctic region. Biological characteristics differ ... after they have spawned for 2 – 3 times. The number of eggs produced per gram of body weight is higher ... in the north. Stocks have declined in most parts of the distributional range due to the impact of ...
Meeting Document : WG-EMM-03/4 : Author(s): K.-H. Kock (Germany) and I. Everson (United Kingdom)