Résultats de la recherche
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Review of CCAMLR activities on monitoring marine debris in the Convention Area
period 1994-1996 at Bird Island and Signy Island, but have declined thereafter. The level of marine ... were reported for the first time from Cape Shirreff. The number of Antarctic Fur seal entanglements at ... entangled at King George Island during the 2002 season, with nylon wrapped around its wing. The number of ... Abstract: The current status of national surveys on monitoring of marine debris and their impact ...
Meeting Document : SC-CAMLR-XXIII/BG/11 : Auteur(s): Secretariat
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Density and abundance estimates of baleen whales recorded during the 2019 DY098 cruise in the Scotia Sea around South Georgia and the South Sandwich Islands
on the abundance of krill and so was not optimised for deriving design-based cetacean abundance ... estimates, but may provide a useful means of comparing whale densities and habitat use patterns between the ... species during the survey (226 sightings of a total count of 495 whales) and were widely distributed east ... of 42.5°W in all water depths surveyed, with fin whales the next most commonly sighted species (53 ...
Meeting Document : WG-EMM-2019/27 : Auteur(s): M. Baines, M. Reichelt, C. Lacey, S. Pinder, S. Fielding, N. Kelly, E. Murphy, P. Trathan and J.A. Jackson
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Age and growth of the Antarctic skate (Amblyraja georgiana) in the Ross Sea
respectively) produced estimated ages at maturity of 6–7 years for males and 8–11 years for females. These ... estimates are near the middle to upper end of the range of ages at maturity for skates worldwide. Author(s ... Abstract: X-rays of vertebral half-centra, and X-rays and transmitted white light examination of ... caudal thorns, were used to estimate the ages of Amblyraja georgiana from the Ross Sea. Caudal thorns ...
Meeting Document : WG-FSA-04/29 : Auteur(s): M.P. Francis and C. Ó Maolagáin (New Zealand)
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Population assessment of Patagonian toothfish in Subarea 48.4
addition of catch at age information for 2011, a minor change to the initial parameters of the selection ... pattern and the inclusion of additional information on size at age. CASAL estimates of stock size, harvest ... rate and recruitment are similar to those of last year’s assessment. B 0 is estimated at around 1,690 ... Abstract: This paper presents an update of the assessment of toothfish (Dissostichus spp.) in ...
Meeting Document : WG-FSA-12/36 : Auteur(s): R. Scott (United Kingdom)
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Influence of data quality and quantity from a multiyear tagging program on an integrated fish stock assessment
-overlap), numbers of tagged fish, duration of the tagging program, using catch-at-length or catch-at-age ... , fishing, and data collection, this study investigated how the bias and precision of biomass estimates from ... an integrated tag-based assessment are influenced by various aspects of a multiyear tagging program ... , particularly the effects of the size of tagged fish compared with the size of fish in the catch (tag size ...
Meeting Document : WG-FSA-13/P03 : Auteur(s): P. Ziegler
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Age distribution of breeding female Antarctic fur seals in relation to changes in population growth rate
Abstract: The age distribution of breeding female Antarctic fur seals at Bird Island, South ... Georgia, in 1988 was compared with the age distribution of a sample obtained in 1971-1973. The mean age in ... age-dependent arrival time at the pupping beach in 1988, the mean age was 6.22 (SE = 0.14 years ... ), which was significantly lower than in 1971-1973. Indicators of population size suggested that population ...
Meeting Document : WG-CEMP-91/21 : Auteur(s): I.L. Boyd, N.J. Lunn, P. Rothery and J.P. Croxall (United Kingdom)
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Age validation of Patagonian toothfish (Dissostichus eleginoides) from Heard and Macquarie Islands
number of observed increments after the mark in relation to the time-at-liberty between tagging and ... number of increments was the same as the observed increments for 88% of cases (when the time-at-liberty ... was known at the time of reading and 52% when the time-at-liberty was not known These results indicate ... counting presumed growth increments on the sectioned face of sagittal otoliths. While there is a general ...
Meeting Document : WG-FSA-05/60 : Auteur(s): K. Krusic-Golub and R. Williams (Australia)
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Impacts of rising sea temperature on krill increase risks for predators in the Scotia Sea
minimally realistic ecosystem model to examine how projected effects of ocean warming on the growth of ... Antarctic krill, Euphausia superba, might affect populations of krill and dependent predators (whales ... for predators by curtailing krill fishing at different points in the 21st century. The projected ... effects of ocean warming on krill biomass were strongest in the northern Scotia Sea, with a ≥ 40% decline ...
Meeting Document : WG-EMM-18/P02 : Auteur(s): E.S. Klein, S.L. Hill, J.T. Hinke, T. Phillips and G.M. Watters
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Do the males of Dissostichus eleginoides grow faster, or only mature before females?
maturity at age and not due to the growth rate. Based on this sample of 434 females and 398 males, it is ... Helena and Cisne Verde during August of 1997-and utilized by the WG-FSA-97 to build the maturity ogives ... concluded that the males mature for the first time at 4 years age and females at 10 years age, reaching 100 ... % maturity at 12 years age the males and 21 years age the females. Author(s): C.A. Moreno (Chile) Title: Do ...
Meeting Document : WG-FSA-98/16 Rev. 1 : Auteur(s): C.A. Moreno (Chile)
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Abundance and trends in the breeding population of Adélie penguins (Pygoscelis adeliae) in the western Ross Sea
in the number of Adélie penguin breeding pairs at colonies in the western Ross Sea. High angle ... , 2001-2010. In contrast, a single declining trend line best represented the number of breeding pairs at ... of change versus loge-transformed colony size all showed a significant negative correlation at lag 1 ... Ecosystem Monitoring Program (CEMP) to detect effects of anthropogenic activities (e.g. commercial fishing ...
Meeting Document : WG-EMM-13/30 : Auteur(s): P. O’B. Lyver, M. Barron, K.J. Barton, S. Gordon (New Zealand), D. Ainley, A. Pollard (USA), P.R. Wilson and M.H. Pinkerton (New Zealand)