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1. Estimation of krill (Euphausia superba) mortality and production rate in the Antarctic Peninsula region

   and resulted a rate of Z = 0.88 (1989/90) and Z = 0.96 (1987/88). Production was estimated and resulted ... a P/B ratio of 0.88 to 0.94 for different years. The exchange rate of water masses and krill biomass within ... biomass (including production) of 4.3 and 5.0 x 10 6 tonnes passing through the survey area during ... was calculated by linearized catch curve analysis and resulted a rate of Z = 0.88 (1989/90) and Z = 0.96 (1987/88 ... (1984) based their calculations on a three year life span of krill. Their age group 1 (20 to 43 mm ... % = - In (O.OI){fm (Tm as longevity in years) Recently published results on number of krill age groups range ... oME89/90 28 z27 .E 26 25 In N(87) = 29.9 - 0.88 AG InN(90)=30.8-0.96AG / 24 ... during a longer life span. Meanwhile a longevity of five to seven years (6 to 8 age groups) is accepted ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 159–176 : Author(s): Siegel, V.

2. An assessment of toothfish in Subarea 48.3 using CASAL

   reporting rates are equal to 1. Estimates of recruitment by age and year class are dependent on bottom ... to be constant over all ages and years, at an assumed value of M = 0.165, which is consistent with previous ... years with different selec- tivities. However, for each fleet, the selectivities- at-age should remain ... – this was the last permitted estimated recruitment, because the last survey began on age-3 fish in the year 2000 ... Paper Title:  An assessment of toothfish in Subarea 48.3 using CASAL Abstract / Description:  This ... paper presents an assessment of the stock of toothfish around South Georgia (Subarea 48.3) using the ... dynamics is explored using Markov Chain Monte Carlo (MCMC) methods; methods for fast approximations to the ... , long-term yield calculations were undertaken, given the CCAMLR decision rules, for five main assessment ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 65–95 : Author(s): Hillary, R.M., G.P. Kirkwood and D.J. Agnew

3. Estimation of natural mortality using catch-at-age and aged mark-recapture data: a multi-cohort simulation study comparing estimation for a model based on the Baranov equations versus a new mortality equation.

   , M, using multiple cohorts and multiple years of catch-at-age and aged mark-recapture data was tested using ... the process error in predicted catch-at-age numbers. Simulations assumed 1 000 releases per year over 12 years ... . Simulations which passed catch-at-age numbers to the estimation algorithm after perturbation by observational ... coefficient of variation (CV) of 0.3 and annual catch of 500 000. Simulations which passed catch-at-age ... multiple cohorts and multiple years of catch-at-age and aged mark-recapture data was tested using ... in predicted catch-at-age numbers. Simulations assumed 1 000 releases per year over 12 years ... . Simulations which passed catch-at-age numbers to the estimation algorithm after perturbation by observational ... be inferred from esti- mated changes in population numbers-at-age after accounting for age- and year-specific ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 1–27 : Author(s): Candy, S.G.

4. Joinville–D’Urville Islands (Subarea 48.1) – a former fishing ground for the spiny icefish (Chaenodraco wilsoni), at the tip of the Antarctic Peninsula – revisited

   at depths of 149 to 282 m on 21 February 2002. Published and unpublished reports from fishing operations ... restricted to the two seasons (1978/79 and 1979/80) when Polish and GDR vessels fished in the area. Length ... elements. The available information on the biology of C. wilsoni was reviewed. Some new information ... islands at depths of 149 to 282 m on 21 February 2002. Published and unpublished reports from fishing ... 3 and 4, with very few 2- and 5-year-old fi sh present (n = 163) (Cielniaszek, 1981). Ageing, however ... sh reached 4 years of age they moved to the east again. They fi rst spawned when 4–5 years old ... . The maximum age found was 9 years (L. Pshenichnov, unpublished data). C. wilsoni migrated diurnally ... (1988) from the Cosmonauts Sea, although no published age estimates have been provided. It should ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 1–20 : Author(s): Kock, K.-H., L. Pshenichnov, C.D. Jones, K. Shust, K.E. Skora and Zh.A. Frolkina

5. Status of krill target strength

   on aggregations of live euphausiids and should not be affected by a frequent cause of bias in single-animal ... there is an empirical basis. The theoretical estimates show a non-monotonic dependence of target strength on both animal ... size and transmit frequency, notwithstanding admitted shortcomings. Some recent single-animal ... of bias in single-animal measurements, namely thresholding. Theoretical estimates for the target strength ... at 30 and 20 kHz. Measurements at 30 kHz were performed near Bouvet Island in December 1979 on krill ... of this ! 108 article, a reasonable fixed value of radius of curvature for the animals is used. In order ... of target strength in the article involve aggregations of animals, it is useful to compare the results ... seawater deployed off a dock at Friday Harbor, Washington. The animals ranged in length from 5 to 90 mm ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 101–126 : Author(s): Foote, K.G., D. Chu and T.K. Stanton

6. Consideration of major issues in ecosystem monitoring and management

   and management 0 20 40 60 80 100 0 2 4 6 8 10 Age at first breeding Su rv iv or sh ip (% ) 0.5 ... Chicks 1.0 Chicks 1.5 Chicks 2.0 Chicks 0 20 40 60 80 100 0 2 4 6 8 10 Age at first breeding Su ... shift 7–8 months 25–150 A3 Breeding population size >1 year 100s A4 Age specific survival 1 year 100s ... population size >1 year B2 Breeding success 7 months B3 Age specific survival 1 year Fur seal C1 Foraging ... / Description:  This paper outlines the requirements of an ecosystem approach to the management of Southern ... Ocean resources and highlights the need for information on harvested and dependent species, their ... interactions and the manner in which their populations vary naturally. Large-scale interactions are catered for ... means of CEMP. The overlap between fishing and predator foraging is being monitored. A mechanism for ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 213–232 : Author(s): Everson, I

7. Revised age and growth estimates for Antarctic starry skate (Amblyraja georgiana) from the Ross Sea

   generated that suggest much slower growth, greater ages-at-maturity (about 20 years compared with 6–11 years ... growth, greater ages-at-maturity (about 20 years compared with 6–11 years) and greater maximum ages ... ) and greater maximum ages (28–37 years compared with 14 years). Several pieces of circumstantial evidence ... Paper Title:  Revised age and growth estimates for Antarctic starry skate (Amblyraja georgiana ... bands, growth curves have been generated that suggest Estimated age (years) 0 10 20 30 40 P el vi ... because it fits the data better, and because reader 2 underestimated Estimated age (years) 0 10 20 30 ... generated that suggest much slower growth, greater ages-at-maturity (about 20 years compared with 6–11 ... , on average, for skates aged up to about 20 years (Figure 2). However, beyond 20 years, reader ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 211–220 : Author(s): Francis, M.P. and M.J. Gallagher

8. Some thoughts on precautionary measures for the krill fishery

   of the spawning biomass dropping below 20% of its pre-exploitation median level over a 20-year harvesting period ... is 10%; and the median krill escapement1 in the spawning biomass over a 20-year period is 75 ... that with a lifespan of five to seven years, at least two generations of krill have passed through the system since ... estimates can be made, leading to more precise conservation measures. Article I1 of the CCAMLR Convention ... 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 ...

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

9. The use of patent databases to predict trends in the krill fishery

   500000 600000 700000 800000 900000 To nn ag e 2003 2004 2005 2006 2007 2008 2009 2010 2011 Year ... - ucts in spite of ban. The Age, 16 June 2010. Available online: www.theage.com.au/national/ australia ... related to uses of krill for Human Use purposes, 1973–2008. 0 10 20 30 40 50 60 70 80 90 19 76 ... to uses of krill for Aquaculture purposes, 1973–2008. 0 10 20 30 40 50 60 70 80 19 76 19 78 ... / Description:  The fishery for Antarctic krill (Euphausia superba) caught 210 000 tonnes in 2009/10 with ... Secretariat so that it can annually update a register of krill-related patents which will be of use for ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 135–144 : Author(s): Foster, J., S. Nicol and S. Kawaguchi

10. Natural mortality rate in the mackerel icefish (Champsocephalus gunnari) around South Georgia

    , but also possibly due to age-dependent mortality and commercial fishing. File:  14everson.pdf ... that is unaffected by confounding effects mainly due to recruitment variation, but also possibly due to age-dependent ... for 2 20 15 10 5 - E a, f F 0 8 6 -5 -10 -1 5 -20 3 4 5 6 7 8 9 Age (years ... exploitation is 0.5. The only other published information on the population age structure of C. gunnavi ... recruited age classes, and no is the number sampled from the first fully recruited year class: To test ... in Figure 1 and assuming that fish are fully recruited at age 3 years. Using the assumption that fish ...

    Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 245–257 : Author(s): Everson, I

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