Résultats de la recherche
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Data on reproduction biology of Dissostichus mawsoni from the Ross Sea (Statistical Subarea 88.1)
maturity at length of 99-102 cm, and males- 102-105 cm. The pattern remained the same when determining 95 ... % of fish with mature gonads. Thus, 95 % of females with mature gonads were noted at length of 120-123 ... cm, and among males- at length of 123-126 cm. In our collections, we noted occurrence of females with ... Abstract: Macroscopic data of the field research obtained during fishing trips on board Spanish ...
Meeting Document : WG-FSA-11/04 : Auteur(s): A.K. Zaytsev (Russia)
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Is toothfish catch correlated with the catch of vulnerable benthic invertebrate taxa?
benthic invertebrate catch rates at a longline segment level. Analysis of the data available showed no ... evidence that the presence of any of six VME taxa was related to Antarctic toothfish catch at the scale of ... relationship between total VME taxa weight and toothfish catch at the scale of a longline set, up to 10km. Our ... Abstract: Accurate estimation of the true impact of bottom fishing on vulnerable marine ...
Meeting Document : WG-EMM-10/27 : Auteur(s): S.J. Parker and M.H. Smith (New Zealand)
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Distribution of foraging by female Antarctic fur seals
Antarctic fur seals breeding at the island of South Georgia. Bathymetric features of the continental shelf ... forage mainly within 100 km of the location at which the offspring was being raised. When this constraint ... was removed at the end of lactation, females foraged to much greater ranges and dispersed to specific ... the spatial impact of breeding female fur seals on krill at South Georgia. This suggested that, in ...
Meeting Document : WG-EMM-03/38 : Auteur(s): I.L. Boyd, I.J. Staniland and A.R. Martin (United Kingdom)
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Review of biological parameters for Ross Sea skates
(TL). The length at maturity of females is not well determined but is probably in the range 95–100 cm ... TL. Length at maturity of B. cf. eatonii is poorly determined, but is about 90–100 cm TL for males ... Abstract: Biological parameters were reviewed and updated for the two main species of skates ... . Differences in length-weight relationships among regions raise doubt about the conspecificity of A. georgiana ...
Meeting Document : WG-FSA-06/31 : Auteur(s): M.P. Francis (New Zealand)
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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)