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1. Integration of CPUE data into assessments using the Generalised Yield Model

   / Description:  For the last three years, CCAMLR's Working Group on Fish Stock Assessment (WG-FSA) has ... completed. It is possible that, with them, some of the qualitative differences in trends may be ... reduction that would be appropriate (SC-CAMLR, 1997, paragraph 4.169; SC-CAMLR, 1998, paragraph 4.117). In ... recommended that the catch limit should be equal to that indicated by the GYM analysis (SC-CAMLR, 1999 ... yield that satisfies objectives for the maintenance of the stock spawning biomass in accordance with ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 65–74 : Автор(ы): Kirkwood, G.P. and A.J. Constable

2. Population genetic structure of Patagonian toothfish in the West Indian Ocean sector of the Southern Ocean

   variation was seen within collections. Comparisons with previously collected genetic data from Heard and ... . Further to this, Hartl and Clark (1989) state that genetic identity (homogeneity) can be maintained with ... al. (2001)) was digested with NlaIII. Table 1: Sample sizes and average lengths of Dissostichus ... Ocean sector could not be rejected. The caveat on this statement is that the failure to disprove the ... Southern Ocean suggests that gene fl ow between these geographically isolated locations is likely to be ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 21–32 : Автор(ы): Appleyard, S.A., R. Williams and R.D. Ward

3. Results of fish stock assessment survey, South Georgia, December 1987 - January 1988

   1970's. A survey to monitor these stocks was carried out from December 1987 to January 1988. It ... complements earlier surveys in the same area and showed that most of the stocks are continuing to decline ... these species will be described in turn, as well as four other species that are of interest in the ... . In summary, it is clear that all of the stocks examined here, with the exception of Ps. georgianus ... species!!" PRINT All observations with an abundance value of o. should be removed!" PRINT This program ... same area and showed that most of the stocks are continuing to decline. Notothenia rossii is showing ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 19-52 : Автор(ы): McKenna, Jr., J.E. and S.B. Saila

4. Estimation of effective sample size for catch-at-age and catch-at-length data using simulated data from the Dirichlet-multinomial distribution

   gave accurate estimators of an ESS that is appropriate for haul-level heterogeneity with increasing ... , with marginal class probabilities generated using a simple age-structured model incorporating fishing ... empirical coefficient of variation (CV) in the proportions, with one being based on an existing CV model ... used for CCAMLR fisheries while the other is a new method. The methods that use haul-level frequencies ... data to be input as the total yearly frequency in the form of class proportions com- bined with the ... aggregation of fish that the jth haul samples with a size-mj random sample of fish, then the number of ... fish in each class, Nj, with realisa- tion nj = (nj,1,…,nj,A), conditional on mj and πj can be ... ′ can be obtained. This estimator of ϕy assumes that, for each year considered independently, the haul ...

   Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 115–138 : Автор(ы): Candy, S.G

5. Krill (Euphausia superba) distribution in relation to water movement and phytoplankton distribution off the northern South Shetland Islands

   chlorophyll a. Water circulation was studied with satellite-tracked buoys equipped with curtain drogues ... distributions of krill and chlorophyll a was observed. It is therefore considered that both hydrodynamic and ... food availability factors may be responsible for krill concentration. On a traditional fishing ground ... 54% lower than that observed in late January 1988. Information from studies of krill predators by US ... ISLANDS T. Ichii, H. Ishii and M. Naganobu* Abstract In December/February 1990/91 a survey was ... circulation was studied with satellite-tracked buoys equipped with curtain drogues deployed at a level of 30 ... laill and chlorophyll a was observed. It is therefore considered that both hydrodynamic and food ... availability factors may be responsible for lain concentration. On a traditional lain fishing ground north of ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 123–140 : Автор(ы): Ichii, T., H. Ishii and M. Naganobu

6. A von Bertalanffy growth model for toothfish at Heard Island fitted to length-at-age data and compared to observed growth from mark–recapture studies

   using a von Bertalanffy (VB) growth model taking into account response-biased sampling of fish that were ... assuming normal errors with constant coefficient of variation using iteratively weighted least squares ... using VP maximum likelihood (MLP) with length-bin relative probabilities defined using fishing ... developed and showed that the bias is relatively small for the range of release lengths in the data ... with this approach is that freedom from bias in the estimated VB parameters is dependent on the other ... probabilities may be involved in selecting fi sh from the LF sample. One sampling scheme that could be used is ... the on-deck LF sample with the particular implementation of general RS sam- pling that is described ... assumed to be known for this study, with its most important feature being a sharp decline in selectiv ...

   Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 43–66 : Автор(ы): Candy, S.G., A.J. Constable, T. Lamb and R. Williams

7. Improving estimates of Adélie penguin breeding population size: developing factors to adjust one-off population counts for availability bias

   point one week after the peak in egg laying, consistent with Standard Method A3 of the CCAMLR Ecosystem ... penguins that left the breeding site prior to the reference point because their breeding attempt failed ... , breeding-age penguins that failed to return to the breeding site in that breeding season, nor pre-breeding ... penguins. The abundance of these components of the population can only be estimated through alternative ... made in accordance with CEMP Standard Method A6a (CCAMLR, 2004), which specifies that chick counts be ... , means that population counts cannot always be obtained at an optimal time of a breeding season for ... may be biased estimators of the breed- ing population and hence have low comparability with counts at ... 30–50 nest sites within the colonies. Ideally, cam- eras should be located at random locations with ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 229–241 : Автор(ы): Southwell, C., J. McKinlay, L. Emmerson, R. Trebilco and K. Newbery

8. Observations of fishing operations on a krill trawler and distributional behaviour of krill off Wilkes Land during the 1985/86 season

   of fished swarms ranged from 100 m to 10 km with different distributions occurring in different ... fishing areas. While catch per towing time reflects within-swarm density, catch per day was thought to be ... space may prove difficult due to problems of standardization when data from different vessels are to be ... grading has come to be adapted following that used for shrimps. White are more valuable than pink. 2.2 ... krill of Wilkes Land is better than that in the Scotia Sea (Table 2). For 'example, catches may be ... composition - 345 - seems to be a possible means of detecting yearly changes in krill biomass in that ... paired samples from 30 sets of measurements, it was concluded that krill were well mixed in the net and ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 335-368 : Автор(ы): Ichii, T.

9. An assessment of the mackerel icefish (Champsocephalus gunnari) off Heard Island

   sizes of maturity and a weight-length relationship. The results show that characteristics of C. gunnari ... populations on the Heard Plateau are sufficiently different from those on Shell Bank for them to be managed ... separately. Precautionary catch limits calculated using the Generalised Yield Model (GYM) are found to be 180 ... , with a range of about two orders of magnitude. At South Georgia and Kerguelen it has been found that ... and recruitment estimates show that the same behaviour can be expected in the populations around ... in September 1993 and August 1997. Fish at stage 2 (developing) or later were considered to be ... these figures with the growth curve shows that the age at first spawning is three years. WEIGHT ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 79–101 : Автор(ы): de la Mare, W.K., R. Williams and A.J. Constable

10. Low genetic diversity and temporal stability in the Antarctic toothfish (Dissostichus mawsoni) from near-continental seas of Antarctica

    et al., 2005; Piyanova et al., 2008; Petrov and Istomin, 2008), who proposed that D. mawsoni can be ... th e lo ci st ud ie d (n um be rs in th e to p ro w re fe r t o sa m pl in g ... conclu- sions about genetic isolation of toothfish in the Ross Sea should be considered with caution ... reasonable to assume that the population structure should be temporally stable and not fluctuate from one ...

    Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 1–9 : Автор(ы): Mugue, N.S., A.F. Petrov, D.A. Zelenina, I.I. Gordeev and A.A. Sergeev

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