Search results
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Using preferred habitat models for chinstrap penguins (Pygoscelis antarctica) to help improve krill fisheries management during the penguin breeding season
planning. Using habitat models to understand which variables influence the distribution of predators at-sea ... can enable us to predict the distributions of un-tracked populations, and thus help to identify any ... impact penguin populations. We show that the distribution of chinstrap penguins can be predicted using ... two simple variables; the distance to the colony and a measure of the direction of travel towards the ...
Meeting Document : WG-EMM-17/33 : Author(s): V. Warwick-Evans, N. Ratcliffe, H.L. Clewlow, L. Ireland, A. Lowther, F. Manco and P.N. Trathan
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Length-age composition of the Patagonian toothfish, Dissostichus eleginoides, from the Kerguelen Island area
annual catches were from 0.5 to 3.1 x 103 tonnes. Mean length of fish taken at 300- 500 m depth was 58.1 ... cm, mean age was 5.8 years. Mean length of fish taken at 540- 600 m depth was 85.8, mean age was 9.7 ... Abstract: Results of length-age composition studies of the Patagonian toothfish, Dissostichus ... eleginoides, from various fishing grounds of the shelf and continental slope areas of the Kerguelen Islands ...
Meeting Document : WG-FSA-92/08 : Author(s): V.G. Prutko and V.N. Chikov (Ukraine)
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Age and growth of Scotia Sea icefish Chaenocephalus aceratus (Lönnberg, 1906), from the South Shetland Islands
Abstract: Samples of Chaenocephalus aceratus were collected during a trawl survey carried out ... observed in other recent surveys within the same area, C. aceratus represented one of the predominant ... along their sagittal plane. To estimate the precision of age data, we compared blind readings by readers ... Bertalanffy growth curves were fitted to the estimated age-length data for each sex. The estimated values of ...
Meeting Document : WG-FSA-02/77 : Author(s): M. La Mesa, J. Ashford, E. Larson and M. Vacchi
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A proposed management procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity
of the OM for the MP testing, and one is assuming that the same process that gener- ated such data ... Zealand, April 2003: www.ccsbt.org/docs/pdf/meeting_ reports/ccsbt_10/report_of_mpws2.pdf. Cooke, J.G ... -recruitment curve steepness h is low. These tests also indicate that monitoring of future catch-at-length ... ) resource in the Prince Edward Islands vicinity Abstract / Description: The status of the toothfish ... , whereas catch-at-length information indicates that past catches have had relatively little impact on ... future TACs in the face of this appreciable uncertainty. Four Operating Models (OMs) reflecting ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 33–69 : Author(s): Brandão, A. and D.S. Butterworth
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DEPREDATION AROUND SOUTH GEORGIA AND THE IMPLICATIONS ON STOCK ASSESSMENT OF D. ELEGINOIDES
conducted which looked at the behaviour of cetaceans around fishing vessels in the area. To aid ... Abstract: Observer data collected on longliners between 2003 and 2009 was analysed to look at the ... levels of depredation caused by killer whales (Orcinus orca) and sperm whales (Physeter macrocaphalus ... ) around South Georgia. Since 2003 cetaceans have been observed on 3000 out of 14644 observed lines (20.5 ...
Meeting Document : WG-FSA-09/16 : Author(s): J. Moir Clark, D.A. Agnew, P. McCarthy and M. Unwin (United Kingdom)
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Integrating Count Effort by Seasonally Correcting Animal Population Estimates (ICESCAPE): a method for estimating abundance and its uncertainty from count data using Adélie penguins as a case study
is published and a raw count cannot be inferred, then ‘pseudo-replicates’ are gener- ated from the adjusted ... to be of practicable benefit. This and other covari- ate-based approaches (e.g. using environmental covariates ... series are typically collected at only a limited number of sites, so surrogate availability information ... , the method is applied to several examples of published studies of Adélie penguin abundance at breeding ... animal count data to a common reference point of breeding chronology for species with a complex temporal ... function of sampling availability. ICESCAPE (Integrating Count Effort by Seasonally Correcting Animal ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 213–227 : Author(s): McKinlay, J., C. Southwell and R. Trebilco
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UPDATED BIOLOGICAL PARAMETERS FOR THE ANTARCTIC STARRY SKATE, AMBLYRAJA GEORGIANA, FROM THE ROSS SEA
relationships differ significantly. Better estimates of median length at maturity were made possible through a ... Abstract: Photographs of skates taken by observers on New Zealand toothfish longliners in the ... Ross Sea were identified to species. Sample sizes were small, but indicated a ratio of 10.75:1 of ... of tagged skates. Biological parameters were reviewed and updated for Amblyraja georgiana. Revised ...
Meeting Document : WG-FSA-08/20 : Author(s): M.P. Francis and S. Mormede (New Zealand)
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An updated descriptive analysis of the toothfish (Dissostichus spp.) tagging programme in Subareas 88.1 and 88.2 up to 2005/06
Abstract: A descriptive analysis of the toothfish tagging programme carried out in Subareas 88.1 ... which were presented in July 2006 at WG-FSA-SAM. In addition, the paper presents release and recapture ... still only available for about half of the non-New Zealand vessels for 2003-04. A reported total of 10 ... . About 17% of the recaptures could not be matched to a release observation, mainly because of missing ...
Meeting Document : WG-FSA-06/34 : Author(s): A. Dunn and S.M. Hanchet (New Zealand)
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Measurement of ocean temperatures using instruments carried by Antarctic fur seals
. Congruence was found at horizontal spatial scales from 0.01° X 0.01° to 0.5° X 0.5° (degrees of latitude and ... longitude), and at a vertical scale of 10 m. However, there was no significant correlation between ... Abstract: The study aimed to test the utility of instruments deployed on marine mammals for ... recorders (TDRs) fitted to lactating Antarctic fur seals foraging from the coast of South Georgia ...
Meeting Document : WG-EMM-01/56 : Author(s): I.L. Boyd, E.J. Hawker, M.A. Brandon and I.J. Staniland (United Kingdom)
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Possible options for the future management of the Antarctic krill fishery in Subarea 48.2
. The proposed framework includes the use of CEMP sites, remote cameras at important land-based predator ... breeding colonies, at-sea observations of predators, oceanographic moorings with acoustic sensors, acoustic ... that might facilitate the development of new management procedures for the krill fishery in Area 48. In ... 2014, the state of ecological knowledge for Subarea 48.2 was reviewed, and it was suggested that the ...
Meeting Document : WG-EMM-15/10 : Author(s): P.N. Trathan (United Kingdom), O.R. Godø (Norway) and S.L. Hill (United Kingdom)