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1. A comparison between otoliths and scales for use in estimating the age of Dissostichus eleginoides from South Georgia

   caught off South Georgia using otoliths and scales. For scales, we made impressions on acetate slides ... Paper Title:  A comparison between otoliths and scales for use in estimating the age of ... result in large errors in age data for long-lived species, usually due to compression of scale circuli ... ; for otoliths, we used transverse sections prepared by baking and grinding the posterior and anterior ... . Sustainable exploitation rates should have been 20-30% of that based on age determinations from scales, in ... using scales than otoliths. There was evidence that for fish older t l~an 16 years (estimated using ... . MSE is an unbiased estimate for o2 within the design, however it is dependent on how the degrees of ... two readings. The bias for Reading 2 by Reader 1 was 0.51 years; the bias for Reading 2 by Reader 2 ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 75–92 : Autor(es): Ashford, J.R., S. Wischniowski, C. Jones, S. Bobko and I. Everson

2. Factors to consider in developing management measures for krill

   Living Resources is given along with an outline of steps for the evolution of management procedures for ... Paper Title:  Factors to consider in developing management measures for krill Abstract ... / Description:  A brief review of the objectives of the Convention for the Conservation of Antarctic Marine ... are dependent on krill forms an integral part of objectives of the Commission for the Conservation of ... Convention for the Conservation of Antarctic Marine Living Resources is given along with an outline of ... operations tend to concentrate on known fishing grounds; there is no reason for fishing fleets to search for ... knowledge; for various reasons, errors will be made in applying conservation measures. Two types of errors ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 175–187 : Autor(es): de la Mare, W.K.

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

   Paper Title:  Biological parameters for icefish (Chionobathyscus dewitti) in the Ross Sea ... during the 2005/06 fishing season. These observers were placed on board three longline vessels targeting ... consistent with previous research. Regression equations for converting standard length to total length and ... for defining length–weight relationships were calculated and presented for both male and female fish ... larger mean asymptotic maximum size than males. Maximum ages of 8 and 11 years were obtained for male ... , includ- ing data on length and reproduction. Kock et al. (2006) documented evidence for egg brooding and ... less than two per set as icefish were not caught on every line. Based on instruction from the New ... number of opaque zones present for fish i; w = an edge interpretation correction after Francis et al ...

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

4. A proposed management procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity

   catches made. An MP with control parameter values specified is proposed for implementation based on the ... results of the trials. Given the importance of an adequate catch rate for the economic viability of the ... Paper Title:  A proposed management procedure for the toothfish (Dissostichus eleginoides ... , whereas catch-at-length information indicates that past catches have had relatively little impact on ... , Nanaimo, B.C. V9R 5K9, Canada. Alistair Dunn and Andre Punt are thanked for their comments on an ... following proce- dure: 1. Numbers-at-age ( ',y aN ) for the start of the year in which projections ... years (i.e. 2008, 2009, etc. for year y’), the generated longline CPUE abundance indi- ces and longline ... 20-year projec- tion period is zero under all OMs except for the Pessimistic one for which it is ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 33–69 : Autor(es): Brandão, A. and D.S. Butterworth

5. The choice of procedure for deciding when to close fisheries regulated by CCAMLR: a simulation model

   Paper Title:  The choice of procedure for deciding when to close fisheries regulated by CCAMLR: a ... simulation model Abstract / Description:  The methods, described in CCAMLR Conservation Measures, used for ... deciding the closure date for fisheries monitored by the Secretariat of CCAMLR, have been difficult to ... fluctuating random catch histories are simulated and the performance of four models for making closure ... when the TAC has been taken. There have now been two seasons for which the Secretariat has had to ... reporting period. 2.1 Catch Rates Catch histories for fisheries were modelled on a daily basis in order ... AC. Two models were used: • Type I catch - random catch rates where C is the catch rate for one ... catch rates will always contain an element of uncertainty, for some methods more than others. The more ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 81–97 : Autor(es): Agnew, D.J.

6. Variations in echosounder calibration with temperature, and some possible implications for acoustic surveys of krill biomass

   implications for acoustic surveys of krill biomass Abstract / Description:  Accurate estimation of krill ... biomass by acoustic techniques is dependent on a number of factors of which one of the most fundamental is ... those applied in the Antarctic, even after adjustments have been made to account for differences in ... which suggest that echosounder transducer performance is dependent on ambient water temperature. Highly ... in continuous operation for at least two days on transit between the point of embarkation for the ... . Here we present calibration data for an EK500 system at 38, 120 and 200 kHz collected over a number ... on each of these occasions. Mean S, and TS transducer gains for each frequency derived from all ... ) calibration spheres required for the higher frequencies stationary in the beam and on axis. In addition, the ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 273–281 : Autor(es): Brierley, A.S., C. Goss, J.L. Watkins and P. Woodroffe

7. 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

   Paper Title:  A von Bertalanffy growth model for toothfish at Heard Island fitted to length-at-age ... data for Patagonian toothfish (Dissostichus eleginoides) at Heard Island (Division 58.5.2) were fitted ... aged. Subsampling of random lengthfrequency (LF) data used to obtain the samples of fish for ageing ... definition of the likelihood function based on variable probability (VP) sampling due to the prespecified ... throw doubt on predic- tions for ages above 5 years; however, it is not the estimation method that is ... – 20 year range. This translated to larger predictions for the MLPLB-fi tted curve for ages below 5 ... immigration), is an important com- ponent of the assessment approach for the HIMI fi sheries (Division 58.5.2 ... unit selection due to fi shing (i.e. selectivity) does not depend on length. However, if, for a ...

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

8. Options for allocating the precautionary catch limit of krill among small-scale management units in the Scotia Sea

   option (v), an example of an adjustable catch limit dependent on the results of ecosystem monitoring, the ... Paper Title:  Options for allocating the precautionary catch limit of krill among small-scale ... management units in the Scotia Sea Abstract / Description:  Following an assessment of Antarctic krill ... catch limit for krill among the SSMUs so as to preclude the inadvertent concentration of catches in a ... provide advice on the establishment of SSMUs for the krill fi shery and on the spatial and temporal ... directed the Scien tifi c Committee to provide advice on how the precautionary catch limit for krill in ... standing stock less predator demand for an SSMU is less than zero, then no catch limit would be allowed ... that the catch limit in an SSMU be an adjustable proportion dependent on the value of an ecosystem ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 81–97 : Autor(es): Hewitt, R.P., G. Watters, P.N. Trathan, J.P. Croxall, M.E. Goebel, D. Ramm, K. Reid, W.Z. Trivelpiece and J.L. Watkins

9. A compilation of parameters for ecosystem dynamics models of the Scotia Sea – Antarctic Peninsula region

   Paper Title:  A compilation of parameters for ecosystem dynamics models of the Scotia Sea ... assessment of methods for subdividing the precautionary catch limit amongst smaller spatial units. This paper ... compiles parameters for use in the ecosystem dynamic models that are needed to assess these methods. These ... parameters include life history and krill consumption parameters for the fish, whale, penguin and seal ... parameters for the fi sh, whale, penguin and seal species that feed on krill in this region. Maximum krill ... models presented at two WG-EMM workshops on Management Procedures (SC-CAMLR, 2005, 2006). These models ... information on SSMUs and historical catch, which is necessary for mod- elling the catch allocation options in ... an upper bound on this important source of uncer- tainty. The intention is to provide a parameter ...

   Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 1–25 : Autor(es): Hill, S.L., K. Reid, S.E. Thorpe, J. Hinke and G.M. Watters

10. Species identification and age estimation for the ridge-scaled macrourid (Macrourus whitsoni) from the Ross Sea

    Paper Title:  Species identification and age estimation for the ridge-scaled macrourid (Macrourus ... Zealand for subsequent confirmation of their identity by researchers from the National Institute of Water ... and Atmospheric Research (NIWA). Two species were found, Macrourus whitsoni and M. holotrachys. A ... previously aged sample from 1999 was confirmed as being solely M. whitsoni, based on otolith comparisons and ... In 1999, CCAMLR observers collected macrou- rid otoliths, for subsequent ageing, on two com- mercial ... . holotrachys Species identifi cation and age estimation for M. whitsoni 44 Marriott et al. 0 10 20 30 ... 40 50 60 70 80 90 100 0 5 10 15 20 25 30 35 40 45 50 55 60 Age (years) To ta l l en gt h ... to collect macrourid specimens for identifi cation. The requirements were ‘Two fi sh at random are ...

    Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 37–51 : Autor(es): Marriott, P., P.L. Horn and P. McMillan

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