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1. Sea-surface temperature and krill catches around South Georgia in December–February 1989–1991 and 1999–2001

   a considerable decrease in mean SST off South Georgia. This observation is especially obvious for the northern ... shelf waters where the mean SST dropped from 3.96°C in 1990/91 to 2.05°C in 2000/01. During that period ... December to February in the late 1990s and early 2000s showed a considerable decrease in mean SST off South ... Georgia. This observation is especially obvious for the northern shelf waters where the mean SST dropped ... showed a considerable decrease in mean SST off South Georgia. This observation is especially obvious ... for the northern shelf waters where the mean SST dropped from 3.96°C in 1990/91 to 2.05°C in 2000/01. During ... maps of monthly mean SST, SST anomalies, SST differences and SST tendencies (Vanyushin and Korobochka ... , 2000). All maps were analysed both numerically and visually. Mean temperature values for all ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 165–174 : Author(s): Vanyushin, G.P

2. Management and assessment options for the crab fishery around South Georgia

   of the fishery and the objectives of the Convention point to the need for a conservative approach to management ... of the fishery and the objectives of the Convention point to the need for a conservative approach to management ... to the need for a conservative approach to management. Such an approach includes the use of catch/effort ... propice 21 la conservation. Cette approche comporterait des contrales de capture/effort de p@che ainsi ... enhance fishery yields by increasing abundance, mean individual size, reproductive output ... also suggests that taking a cautious and conservative approach to management would be appropriate ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 193–202 : Author(s): Basson, M. and D.D. Hoggarth

3. Supplementary data on exploited stocks in Division 58.5.1 (Kerguelen)

   , BbInOJIHeHHbIX Ha yq aCTKe 58.5.1 (OCTpOB KepreJIeH) C 1986/87 no 1988/89 rr., npe,llOCTaBl-IJIaCb B03MO ... for a forecast on the future of the stock following the implementation of some conservation measures ... of the stock in five years. The implementation of conservation measures does not, however, always allow ... and continuing survey allowing for the modification of catch sizes and conservation measures in force ... / Description:  The results of fishing cruises carried out from 1986/87 to 1988/89 in Division 58.5.1 (Kerguelen ... average annual growth of 36% has been noted in the abundance of the juvenile section of the stock of ... research cruises. The abundant 1985 cohort of  Champsocephalus gunnari appeared in the shelf stock and it ... reached legal catch size. The value of the selected abundance index (catch per unit effort expressed in ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 147–161 : Author(s): Duhamel, G.

4. An index of per capita recruitment

   the frequency distribution of R1 and the assumed value of M. Three distributions, each with a mean of 0.5 ... for several levels of M. When R1 followed a normal distribution with a mean of 0.5 and a standard deviation ... the level of mortality increased, the mean and mode of the distributions of PCR decreased, although ... constant with changes in the level of mortality. When R1 followed a lognormal distribution with a mean ... recruitment (PCR) is proposed such that where R 1 is the proportion of age-l animals sampled in year y and M ... distributions of R I, and three levels of M were assumed in order to investigate the resulting distributions of ... years, and when all age-l animals spawn. These conclusions are insensitive to changes in the shape of ... in mortality and reduction in the proportion of age-l spawners. Introducing year-to-year random ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 179–196 : Author(s): Hewitt, R

5. Scientific observations in CCAMLR fisheries – past, present and future

   is responsible for the conservation of Antarctic marine living resources, including their rational use ... as seabirds. Although manage- ment of seals and whales falls under the 1973 Convention for the Conservation ... of the Antarctic eco system for which it is responsible in developing conservation strategies. The conservation ... ’ and ‘pre cau tionary’ approach to the conservation of marine living re sources. These principles have set ... -independent studies are difficult and expensive to conduct. In addition, the size of the Convention Area, its ... observers on board fishing vessels has assumed prominence in the collection of essential data for fisheries ... management purposes. The Scheme of International Scientific Observation, adopted by CCAMLR in 1992, is ... own country. This paper outlines the history of the scheme in terms of its logistics, participation ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 81–98 : Author(s): Sabourenkov, E.N. and E. Appleyard

6. Statistical problems in krill stock hydroacoustic assessments

   of the random sample mean and random sample variance will often provide a biased estimate of the mean ... by the contagious distribution of the negative binomial or Poisson type models where mean and variance ... . The time-series information cannot be obtained by any other means and, so long as data are collected ... applied to establish biomass in a survey area and the second is the improvement in accuracy of target ... -strength measurements. In the case of statistical methods, there are no clear guidelines for deciding what ... does not invalidate the use of available methods to conduct surveys and analyze results. In the case of ... to be not the absolute amount of biomass present in an area, but rather how it is distributed. The ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 301–309 : Author(s): Macaulay, M.C.

7. Estimates of circumpolar abundance of Antarctic krill based on recent acoustic density measurements

   was not available, Subarea 48.6 and Area 88, the mean density from the recent BROKE survey was used. This density ... each of the areas was then summed to give three overall biomass estimates: mean, high and low ... subareas there is a large enough range of values to obtain maximum, minimum and mean figures (Table ... for these regions based on densities from regional surveys. A mean, intermediate v&e, and a maximum and minimum ... tonnes- at the low end of values that have been suggested in the past. The differences between our ... survey of the South Atlantic in January 2000 may result in an effective biomass which is greater than the ... value used in the past. The seasonal and local consequences of large catch limits will have to be taken ... density measurements Abstract / Description:  The total circumpolar abundance of Antarctic krill ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 87–99 : Author(s): Nicol, S., A.J. Constable and T. Pauly

8. Maximum entropy reconstructions of krill distribution and estimates of krill density from acoustic surveys at South Georgia, 1996–2000

   Entropy (MaxEnt) reconstructions of krill distribution and estimates of mean krill density within two ... in the observed data. Despite some very large interannual and regional differences in mean krill density ... influencing krill distribution, and hence krill/predator interactions. The MaxEnt technique also yields mean ... of mean krill density within two survey boxes (dimensions 80 km × 100 km) north of South Georgia ... of krill distribution and estimates of mean krill density within two survey boxes (dimensions 80 km × 100 ... large interannual and regional differences in mean krill density, the MaxEnt approach works well ... , and hence krill/predator interactions. The MaxEnt technique also yields mean krill densities for each ... data. The approach is Bayesian and generates the most-probable infer- ence of the mean krill density ...

   Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 91–100 : Author(s): Wafy, M.H., A.S. Brierley, S.F. Gull and J.L. Watkins

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

   (k=1,…,N) are independently and identically distributed gamma-random variables with mean μw and variance 2 wwμφ (e.g ... . the weight of the kth fi sh in the haul) and N is distributed as a Poisson random-count variable with mean ... distribu- tion with mean τ, the distribution of Z has non-zero mass at Z = 0. The distribution ... of freedom or the residual mean deviance (McCullagh and Nelder, 1989). If the latter is used then ∑φ ji ... CCAMLR areas is to model the haul-by-haul ratios of catch to effort as the response variable in a ... model (GLMM), in order to provide more efficient estimates of the standardised CPUE time series and more ... as a result of the imbalance in the number of hauls in the year-by-vessel cross-classification ... . Further, the inclusion of an area stratum by fishing year interaction as an additional random effect in ...

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

10. Krill population biology during the 1991 Chilean Antarctic krill fishery

    0.01 g. Mean catch-per-hour and mean catch-per-towing time were determined from a total of 419 hauls ... , with a mean TL of 45 mm for females and 48 mm for males. A very weak mode for juvenile specimens between 26 ... (mean length 43 mm for females and 46 mm for males), and the other (modal length 32 mm) for juvenile ... 0.01 g. Mean catch-per-hour and mean catch-per-towing time were determined from a total of 419 hauls ... ) to the nearest 0.01 g. Mean catch-per-hour and mean catch-per-towing time were determined from a total of 419 ... and 55 mm TL, with a mean TL of 45 mm for females and 48 mm for males. A very weak mode for juvenile ... , with one mode between 32 and 55 mm TL (mean length 43 mm for females and 46 mm for males), and the other ... r. Bcero 6bIJlO BbInOJlHeHO 419 TpaJleHl-lti. Onpe,lleJlI-IJlI-ICb Cpe,llHl-lti BbIJlOB 3a tIac 1-1 Cpe ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 223–235 : Author(s): Mujica R., A., E. Acuña S. and A. Rivera O.

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