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

   to adjust one-off population counts for availability bias Abstract / Description:  New methods are ... presented for the collection and development of data to adjust counts of Adélie penguins made at any time in ... the breeding season to an estimate of the breeding population. The development of ‘availability ... population obtained by adjusting a one-off count using availability adjustment factors will not account for ... vegetation, for example, may not be available for counting by an observer passing overhead in an aircraft ... , and marine species diving underwater may not be available for counting by an observer in a passing ... , means that population counts cannot always be obtained at an optimal time of a breeding season for ... develop availability adjust- ment factors for population estimation, they pro- vide important background ...

   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

2. Biological parameters for icefish (Chionobathyscus dewitti) in the Ross Sea, Antarctica

   mature at about 340–360 mm total length (TL) and about 3–4 years of age, and that 95% were mature at ... about 370–400 mm TL and 6–8 years of age. Counts of growth zones in sectioned otoliths were used to ... Paper Title:  Biological parameters for icefish (Chionobathyscus dewitti) in the Ross Sea ... , meristics, reproductive biology, diet and age estimation. All of the icefish sampled were identified as ... total length (TL) and about 3–4 years of age, and that 95% were mature at about 370–400 mm TL and 6–8 ... years of age. Counts of growth zones in sectioned otoliths were used to determine ages and von ... larger mean asymptotic maximum size than males. Maximum ages of 8 and 11 years were obtained for male ... were recorded for each otolith reading (Table 3). Age estimation Zone counts were converted to age ...

   Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 139–165 : Автор(ы): Sutton, C.P., M.J. Manning, D.W. Stevens and P.M. Marriott

3. The biology, ecology and development of fishery management advice for the anomuran crabs at South Georgia (CCAMLR Subarea 48.3)

   Paper Title:  The biology, ecology and development of fishery management advice for the anomuran ... crabs at South Georgia (CCAMLR Subarea 48.3) Abstract / Description:  This review summarises the ... available information on the biology and ecology of the lithodids at South Georgia and provides an overview ... of the development of a management regime for them. Finally it aims to highlight areas in which ... (Lovrich and Vinuesa, 1999) and enters the fishery at an approximate age of 15 years (Lovrich, 1997 ... and provides an over- view of the development of a management regime for them. Finally, it aims to ... 'S 55°15'S 55°30'S 55°45'S 5 Fishery management advice for the anomuran crabs at South Georgia ... ) 40 0– 1 60 0 13 5– 80 0 42 0– 2 50 0 60 0– 1 20 0 45 0– 60 5 Si ze ra ng e C ...

   Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 1–15 : Автор(ы): Belchier, M., T. Peatman and J. Brown

4. Some thoughts on precautionary measures for the krill fishery

   Paper Title:  Some thoughts on precautionary measures for the krill fishery Abstract / Description ... :  The concept of precautionary measures for krill is discussed. A precautionary catch limit, based on ... (WG-Krill) is discussed and it is concluded that such a method is appropriate in setting an overall ... refinement to provide a sufficient safeguard for land-based predators. A new approach is described which ... limited region close to predator colonies. Arising from this concern has been a quest for an equable way ... still unable reliably to predict where krill concentrations will occur. For many years now the ... within Subarea 48.3, and we take this as an example to develop ideas for incorporating the requirements ... available for analysis and are published in the CCAMLR Statistical Bulletin in a more summarised format ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 1–11 : Автор(ы): Everson, I. and W.K. de la Mare

5. Estimating the impact of depredation by killer whales and sperm whales on longline fishing for toothfish (Dissostichus eleginoides) around South Georgia

   fishing for toothfish (Dissostichus eleginoides) around South Georgia Abstract / Description:  Observer ... and 4 animals, and have a relatively lower impact on catches, depressing CPUE by up to 20%. Sperm ... whales have been more frequently encountered in recent years, occurring in larger pod sizes, whereas ... between months. Both species demonstrate an east to west migration throughout the season that is not ... South Georgia Li ne s S P W o bs er ve d (% ) 100 90 80 70 60 50 40 30 20 10 0 May ... cetaceans observed (Table 1) it is possible to estimate the aver- age consumption per animal. For killer ... types were killer whales, sperm whales and both species. An overall correction factor for the year can ... must decide how to account for what can be considered an unattributed source of fishery-related ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 163–178 : Автор(ы): Moir Clark, J. and D.J. Agnew

6. A hypothetical life cycle for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea region

   Paper Title:  A hypothetical life cycle for Antarctic toothfish (Dissostichus mawsoni) in the Ross ... of eggs and larvae over a 6–24 month period were investigated using an oceanic circulation model ... locations of toothfish larvae after an 18–24 month period were moderately consistent with the distribution ... probably remain in the northern area for 6–18 months before migrating back to the slope to regain condition ... 70°S from December to May for all years and all vessels. Month G S I ( % ) 0 5 10 15 20 25 ... is mature at 100 cm (range 85–115 cm), which is equivalent to an age of 9–10 years (Dunn and ... , after reaching a length of about 15 cm, and an age of about 21 months, they become more benthic. For ... adjacent slope areas. Fish mature at a length of 100–120 cm, at an age of 8–12 years, by which time they ...

   Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 35–53 : Автор(ы): Hanchet, S.M., G.J. Rickard, J.M. Fenaughty, A. Dunn and M.J. Williams

7. Is the attempt to estimate the biomass of Antarctic fish from a multi-species survey appropriate for all targeted species? Notothenia rossii in the Atlantic Ocean sector – revisited

   appropriate for all targeted species? Notothenia rossii in the Atlantic Ocean sector – revisited Abstract ... already heavily fished at the beginning of the 1970s. The closure of the fishery for this species in 1985 ... to provide more accurate estimates of the abundance of the species, it is suggested that an acoustic ... trends in abundance. Despite the closure of the fi shery almost 20 years ago, none of these multi ... less than 20 min duration were disregarded. All survey data are held in the CCAMLR database. For ... properly in the almost 20 years since the fi shery was closed. Two alternatives to the approach generally ... , Hobart, Australia: 30 pp. Barrera-Oro, E.R. and R.J. Casaux. 1992. Age deter- mination of juvenile ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 141–153 : Автор(ы): Kock, K.-H., M. Belchier and C.D. Jones

8. A statistical method for estimating the level of IUU fishing: application to CCAMLR Subarea 48.3

   , and confidence intervals for, fish and bird catches by IUU vessels. In order to estimate an IUU catch ... catches for the years 2001/02, 2002/03 and 2003/04. File:  07agnew-kirkwood.pdf ... there must have been at least one encounter with an FPV in a year; no encounters in a year are ... with IUU fishing. The mean and variance of fish catch rate was calculated for each area and each year ... encounter with an FPV in a year; no encounters in a year are interpreted as zero IUU fi shing. For each IUU ... actual FPV record for a year (October to September), an IUU cruise was randomly placed within the year ... catches for the years 2001/02, 2002/03 and 2003/04. Résumé Ce document décrit une nouvelle méthode ... 30°W 50°S 52°S 54°S 56°S 6 123 Statistical method for estimating the level of IUU fi shing ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 119–141 : Автор(ы): Agnew, D.J. and G.P. Kirkwood

9. On the power to detect changes using the standard methods for monitoring parameters of predatory species

   Paper Title:  On the power to detect changes using the standard methods for monitoring parameters ... of predatory species Abstract / Description:  The CCAMLR guidelines (CCAMLR, 1989) for analyzing the ... considered here are insufficient for conducting power analyses (penguin arrival weight A1.1, trend in penguin ... population size A3.1, penguin demography A4.1, penguin fledging weight A7.1). Alternative forms for analyses ... ) to compute the requisite sample sizes for detecting changes of 10%, 20% and 30% of the mean value ... sample sizes for detecting changes of 10%, 20% and 30% of the mean values are shown in Table 2. No ... detect changes of 10%, 20%, and 30% of the mean values for Adelie and chinstrap meal size (Table 6 ... %) 119 96 72 46 2.48 (20%) 31 25 1 9 1 3 3.72 (30%) 1 5 1 2 9 7 For Cl = 0.10: 1.24 (10%) 99 79 57 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 377–397 : Автор(ы): Boveng, P. and J.L. Bengtson

10. Effects of recruitment variability and natural mortality on generalised yield model projections and the CCAMLR decision rules for Antarctic krill

    projections and the CCAMLR decision rules for Antarctic krill Abstract / Description:  The generalised yield ... model (GYM) was used by CCAMLR to establish the precautionary catch limit for the Antarctic krill ... natural mortality rate of 0.8 and recruitment variability generated using a Beta distribution for ... proportional recruitment of krill. In this study, krill sampling data for empirical size frequencies were ... years and CCAMLR criteria calculated both for any given year in all years, and for only the final year ... whether or not the population effects associated with the pro- posed catch are acceptable. For krill in ... both criteria are met is then used to calculate the precautionary catch used as an upper limit for ... with a model for population dynamics that extended an earlier dynamic model for fisheries management ...

    Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 81–96 : Автор(ы): Kinzey, D., G. Watters and C.S. Reiss

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