Search results
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Progress on the application of an age-structured production model fitted to commercial catch-rate and catch-at-length data to assess the toothfish (Dissostichus eleginoides) resource in the Prince Edward Island vicinity
allow the estimation of a selectivity-at-age function that decreases at larger ages. This is, in ... particular, to accommodate the view of the August 2003 meeting of the Subgroup on assessment methods that 0.2 ... yr-1 is likely the largest value of natural mortality M that is plausible for toothfish. Catch, catch ... . In the meantime, based upon a cautious interpretation of projections over the wide range of current ...
Meeting Document : WG-FSA-03/97 : Author(s): A. Brandão and D.S. Butterworth (South Africa)
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Fecundity and size at sexual maturity of the bigeye grenadier (Macrourus holotrachys) at South Georgia (CCAMLR Subarea 48.3)
at different stages of development suggesting that M. holtrachys may have an extended spawning season ... . Analyses of size at sexual maturity indicate that Lmat 50 occurs at 29cm (pre-anal length) whilst Lint 50 ... final ovarian development is a prolonged process in M. holotrachys which probably lasts for a period of ... greater than a year. Sex ratios of specimens caught in the longline fishery are highly skewed with females ...
Meeting Document : WG-FSA-02/26 : Author(s): T. Mulvey, S.A. Morley, M. Belchier and J. Dickson (United Kingdom)
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CIRCULATION IN THE ROSS SEA SECTOR OF THE SOUTHERN OCEAN: REPRESENTATION IN NUMERICAL MODELS
Abstract: The circulation in the Ross Sea sector of the Southern Ocean is examined in three ... numberical models of intermediate to high resolution. Despite the model differences (including physics ... , forcing) the circulation representation is relatively consistent, both in terms of the mean and some ... aspects of monthly variability. This could point to strong bathymetric constraints on the circulation. In ...
Meeting Document : WG-EMM-09/41 : Author(s): G.J. Rickard (New Zealand), M. Roberts (United Kingdom), M.J.M. Williams, A. Dunn, M.H. Smith and M. Pinkerton (New Zealand)
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On the taxonomy of the Lepidonotothen squamifrons group (Pisces, Perciformes, Notothenioidei)
Abstract: The Lepidonotothen squamifrons group has been described to be comprised of 3 species: L ... overlapping. Enzyme electrophoresis of enzyme polymorph isms has been applied to specimens morphologically ... ; represent only populations of one species. Evidence is presented that the third species of the group, L ... comprised of only one species, Lepidonotothen squamifrons (Günther, 1880). We found no statistically ...
Meeting Document : WG-FSA-93/25 : Author(s): R. Schneppenheim and K.-H. Kock (Germany), G. Duhamel (France) and G. Janssen (Germany)
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Variations in food composition and feeding intensity of mackerel icefish (Champsocephalus gunnari) at South Georgia
Abstract: The diet composition and feeding intensity of mackerel icefish (Champsocephalus gunnari ... ) around Shag Rocks and the mainland of South Georgia was investigated in January/February 1985, January ... of krill and Themisto in the diet items varied considerably between the three seasons, whereas the ... proportion of mysids in the diet remained fairly constant. krill is obviously the prefered diet. In years of ...
Meeting Document : WG-FSA-92/26 : Author(s): K.-H. Kock (Germany), I. Everson (United Kingdom), S. Wilhelms (Germany), S. Campbell (United Kingdom), J. Szlakowski (Poland), G. Parkes (United Kingdom), Z. Cielniaszek (Poland) and C. Goss (United Kingdom)
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Some comments on the procedure for testing estimators of krill abundance which utilise survey data
Abstract: Since krill distributional data do show evidence of spatial correlation, estimators of ... performance in practice. Such studies require a simple method for computer generation of krill distribution ... " models of krill distribution are considered. These achieve overall spatial correlation by placing ... encouraging improvement in fits to the distribution of inter-swarm distances observed on the 1981FIBEX survey ...
Meeting Document : WG-KRILL-91/21 : Author(s): D.S. Butterworth, D.L. Borchers and D.G.M. Miller (South Africa)
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Progress report for the third year of the research fishery for Dissostichus spp. in Subarea 48.6 being jointly undertaken by Japan and South Africa: 2013–2015.
participated in the research project in each of the three fishing seasons and the progress achieved during the ... first 2.5 years is reported. Between December 2012 and April 2015 a total of 291 Dissostichus ... eleganoides and 3273 D. mawsoni were tagged and released, and a total of 10 and 49 tagged D. eleganoides and D ... the southern half of Subarea 48.6 already in the current season, more than total number for all ...
Meeting Document : WG-SAM-15/50 : Author(s): R.W. Leslie (South Africa), K. Taki, T. Ichii (Japan) and S. Somhlaba (South Africa)
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Progress report of the CEMP camera network in Subarea 48.1
Abstract: We provide a brief update on the progress of our project “Establishing a CEMP Camera ... project is now running, with 53 time-lapse cameras installed throughout Subarea 48.1. Installation of ... of pre-existing cameras at some sites enabled validation studies to be completed and partial network ... coverage of breeding chronology and success estimates for 2015/16. We were also able to develop methods ...
Meeting Document : WG-EMM-16/58 : Author(s): J. Hinke, G. Watters, M. Santos, M. Korczak-Abshire, G. Milinevsky, A. Barbos, C. Southwell and L. Emmerson
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Habitat preferences of Adélie and chinstrap penguins during pre-moult
Abstract: In order to understand and mitigate for the potential impacts of anthropogenic ... phase of the annual cycle. We show that Adélie penguins have an affinity to forage and moult on sea-ice ... to moult. However, habitat models aimed to predict the preferred foraging habitats of penguins during ... understand the distribution and foraging behaviour of penguins during certain stages of the life-cycle, and ...
Meeting Document : WG-EMM-18/P12 : Author(s): V. Warwick-Evans, M. Santos and P.N. Trathan
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ESTIMATING THE NUMBER OF PRE- AND INTERMITTENT BREEDERS ASSOCIATED WITH THE BÉCHERVAISE ISLAND ADÉLIE PENGUIN POPULATION
Abstract: The size of two of the inaccessible (non-breeding) components of the Adélie penguin ... a series of mark-recapture analyses and some simple population modelling techniques. Author(s): L ... . Emmerson and C. Southwell (Australia) Title: ESTIMATING THE NUMBER OF PRE- AND INTERMITTENT BREEDERS ...
Meeting Document : WG-EMM-PSW-08/08 : Author(s): L. Emmerson and C. Southwell (Australia)