Search results

1. Intra-annual variability in the density of Antarctic krill (Euphausia superba) at South Georgia, 2002–2005: within-year variation provides a new framework for interpreting previous ‘annual’ estimates of krill density

   of bad data (e.g. near-surface dead zones, ‘blank after transmit’ and periods of interference). TVG ... the ADCP-derived GPS position for the start and end of each interval. The daily mean krill density ... weeks (i.e. annual). In each year, prominent changes in krill density occurred after March ... out in 1986, during a study of predator–prey interac- tions around the western end of South Georgia ... Paper Title:  Intra-annual variability in the density of Antarctic krill (Euphausia superba) at ... profilers (300 kHz) and echo sounders (125 kHz) were deployed on moorings on- and off-shelf to the northwest ... = 64.2). A sinusoidal regression model (period = 52 weeks) with time as the independent variable ... explained 64% of the observed week-to-week variation. Estimates of krill density from moored instruments ...

   Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 27–41 : Author(s): Saunders, R.A., A.S. Brierley, J.L. Watkins, K. Reid, E.J. Murphy, P. Enderlein and D.G. Bone

2. Modelling catch and effort data using generalised linear models, the Tweedie distribution, random vessel effects and random stratum-by-year effects

   ’ values defi ned using parameter estimates for reference levels of other predictors, after being ... the confi dence interval end-points using the inverse link function. Catch and effort data Longline fi ... simulation set of Tweedie residuals, 100 random sets were gener- ated and after sorting each set ... for their coeffi cients. After setting the coeffi cients for these two vessels to zero, the median of the vessel ... Paper Title:  Modelling catch and effort data using generalised linear models, the Tweedie ... distribution, random vessel effects and random stratum-by-year effects Abstract / Description:  The current ... CCAMLR areas is to model the haul-by-haul ratios of catch to effort as the response variable in a ... standardised CPUE estimates and their precision can be obtained from the ‘fishing year’ parameter estimates ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 59–80 : Author(s): Candy, S.G

3. A possible framework in which to consider plausible models of the Antarctic marine ecosystem for evaluating krill management procedures

   ), to begin to review how the CCAMLR Ecosystem Monitoring Program could provide information to assist ... with manage- ment of the krill fi shery (SC-CAMLR, 2003), and now to begin to evaluate proposals aiming ... after their fi nal reproduction and their body mass is largely consumed at the surface rather than ... ‘drivers’, and (iii) the rates of mortality of taxa at the end of the food chains. For Antarctic marine ... Paper Title:  A possible framework in which to consider plausible models of the Antarctic marine ... management procedure for the krill fishery, including the evaluation of candidate management procedures in a ... simulation framework, using plausible models of the Antarctic marine ecosystem. This paper develops a ... framework for erecting such models. It discusses the general model requirements and presents a conceptual ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 99–117 : Author(s): Constable, A.J

4. A simulation study of the method of deriving natural mortality rate using data for Champsocephalus gunnari in Subarea 48.3

   beginning from age ar is: ak F y = L Wa,y x F a,y a=a/ where Wa,y are weight factors ... Paper Title:  A simulation study of the method of deriving natural mortality rate using data for ... Champsocephalus gunnari in Subarea 48.3 Abstract / Description:  A method of determining the rate of natural ... mortality, based on the construction of a regression between the rate of annual fishing mortality ... (determined by VPA) and fishing effort is described. The intersect of this regression must be equal to zero if ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 69–83 : Author(s): Gasyukov, P.S. and R.S. Dorovskikh

5. Length- and age-at-spawning of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea

   shows that once development begins, oocytes grow and accumulate at the cortical alveoli stage ... that once development begins, oocytes grow and accumulate at the cortical alveoli stage for at least one ... begins, oocytes grow and accumulate at the cortical alveoli stage for at least one year. Individual ... sam- pled after the spawning season (hindcasting). This evidence consists of post-ovulatory follicles ... or resorbed as new development begins, but others may last several months to a year, tending to per- sist ... alveoli (end of the primary growth phase) were classified as ‘not spawned’. Ages were determined ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 53–73 : Author(s): Parker, S.J. and P.J. Grimes

6. Estimating unaccounted fishing mortality in the Ross Sea region and Amundsen Sea (CCAMLR Subareas 88.1 and 88.2) bottom longline fisheries targeting Antarctic toothfish

   grooming Fishing years are assigned to the year in which the fishing season ended (i.e. the 2007/08 ... mortality after being lost. The following terminol- ogy is used to distinguish categories of gear loss ... . Here- after this is referred to as ‘hooks lost’. Catch and effort data were extracted from the CCAMLR ... retained after the grooming procedure and the proportion of data remaining after grooming by gear type ... Paper Title:  Estimating unaccounted fishing mortality in the Ross Sea region and Amundsen Sea ... counted in estimates of total fishing removals or otherwise accounted for in stock assessment models. The ... mortality resulting from the loss of sections of bottom longline gear in the Ross Sea region and Subarea ... average 208 tonnes of Antarctic toothfish mortality may be unaccounted for annually. While the current ...

   Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 17–30 : Author(s): Webber, D.N. and S.J. Parker

7. Assessing the power to detect systematic change in Adélie penguin foraging trip duration

   there is a constant rate of increase for a number of years, after which the mean level remains constant. Monitoring ... or ‘baseline’ data) and b years after that impact (post- impact data) from 2n penguins (i.e. n pairs) each ... stages respectively, (ii) an impact after a years causes either a step, ramp or trend change ... after an impact (i.e. Mi+1 = Mi + pMi, or 1 1i i M p M + = + , where Mi is the expected trip ... Paper Title:  Assessing the power to detect systematic change in Adélie penguin foraging trip ... variation was known to occur. Variability among trips and penguins was greater in the crèche stage, but ... variability among years was greater in the guard stage. Estimates of variability were used to explore the ... greater in the crèche stage than the guard stage. The gain obtained by increasing the number of penguins ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 201–215 : Author(s): Southwell, C., J. Clarke and L.M. Emmerson

8. Surface water circulation in krill fishing areas near the South Shetland Islands

   but both reached the South Georgia area 110 to 120 days after they had left the South Shetlands (Figures ... l(c) and 3(b)). After entrainment there for 25 days (as indicated by semicircular movements), it moved northeast along ... to the distribution of krill catches (Figures 3 and 4). Fishing usually begins in January (Figure 3). Ichii ... Paper Title:  Surface water circulation in krill fishing areas near the South Shetland Islands ... deployed in shelf and oceanic waters to the north of the South Shetland Islands. Each buoy was deployed ... with a drogue attached at a depth of 30 m to assess flow patterns at the depth range where krill tended ... to be most abundant. The buoys were tracked using the ARGOS satellite positioning system. Based on ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 125–136 : Author(s): Ichii, T. and M. Naganobu

9. Observations on haul-out patterns and trends in the breeding populations of southern elephant seal at Península Valdés (Patagonia) and Stranger Point (25 de Mayo - King George I.)

   of females from these two breeding places. - 456 - The second one was included because after ... census, at Stranger Point this should be carried out after the 30/10 (27/10 plus the 3-days rank ... ), and at Peninsula Valdes after the 5/10 (30/9 plus 5-days rank). Here the weaning pups immigration from other areas ... population trends. Migration between subantarctic and antarctic places after the breeding season have ... Paper Title:  Observations on haul-out patterns and trends in the breeding populations of southern ... de Mayo-King George I. were studied during the breeding season from 1979 to 1987. Two main objectives ... were taken into consideration: haul-out pattern and the female population trend. In both places, the ... intrinsic population growth rate is positive. In 1982, at Stranger Point, a sharp decrease of the female ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 453-463 : Author(s): Vergani, D.F., M.N. Lewis and Z.B. Stanganelli

10. By-catch, growth and feeding of Antarctic juvenile fish taken in krill (Euphausia superba Dana) fisheries in the South Georgia area, in 1992

    the tip of the rostrum to the end of telson) and weighed. The stomach contents of 108 specimens ... the coastal fjords and feed on copepods (Rembiszewski et al., 1978; North and Ward, 1990). After leaving ... superba Dana) fisheries in the South Georgia area, in 1992 Abstract / Description:  This paper discusses ... an investigation of juvenile Antarctic fish caught during krill fishing by the FV Grigory Kovtun in ... the area around South Georgia from May to July 1992. Two species were predominant in the by-catches ... : Champsocephalus gunnari and Nototheniops larseni. The frequency of occurrence of juvenile fish was 18.2% when all ...

    Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 129–142 : Author(s): Pakhomov, E.A. and S.A. Pankratov

Pages