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1. Alternative methods for determining subarea or local area catch limits for krill in Statistical Area 48

   for implementation. However, two of the alternatives (i.e., protective zones and critical periods) are ... unsatisfactory only because they would alter current fishing patterns. These two alternatives could be ... single year. Then, for the following two years, that subarea would be closed to fishing. For example, if ... fishing during the two following years while Subareas 48.2 and 48.3 were subsequently opened and closed ... Shetland Islands. Document WG-CEMP-90/30 Rev. 1. CCAMLR, Hobart, Australia: 24 pp. CROXALL, J. 1990 ... available for implementation. However, two of the alternatives (Le., protective zones and critical periods ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 237–249 : Autor(es): Watters, G. and R.P. Hewitt

2. Can toothfish catches be used to predict the presence of vulnerable benthic invertebrate taxa?

   °W 80° S 75° S 70° S 65° S 60° S 150 °E 160° E 170°E 180° 170°W 160°W 150°W 80° S 75° S ... spatial analysis. 60° S 65° S 70° S 75° S 80° S 160° E 150 °E 170°E 180° 170°W 160°W 150°W ... one VME taxon), many individual taxa were rarely observed (Table 2). Correlations of presence are ... 70° S 65° S 60° S 1 2 3 4 Figure 1: Ross Sea region indicating areas where segment-level ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 87–96 : Autor(es): Parker, S.J. and M.H. Smith

3. An alternative method for estimating the level of illegal fishing using simulated scaling methods on detected effort

   example 80%) File:  08ball.pdf ... is patrolling the region. Vessel Starting date Ending date One 30 44 Two 60 74 Three 90 104 ... 20 Vessels. Evasion 0.2 E st im at ed d ay s fis he d 300 400 500 600 700 800 900 Actual ... days fished 200 400 600 800 1000 E st im at ed d ay s fis he d 20 Vessels. Evasion 0.5 ... Actual days fi shed 5 illegal cruises 10 illegal cruises 20 illegal cruises E st im at ed d ay s ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 143–161 : Autor(es): Ball, I

4. The CCAMLR-2000 Krill Synoptic Survey: a description of the rationale and design

   krill which are used in models to estimate sustainable yield in Area 48. The survey design includes two ... large-scale oceanic strata: one in the southwest Atlantic located in the Scotia Sea, and the other to ... will take several years and will result in a significant increase in the knowledge of krill length ... estimate sustainable yield in Area 48. The survey design includes two large-scale oceanic strata: one in ... Limit of Grid of Grid Northern Southern Western Eastern Scotia Sea 62'5, 40°W 0" 49"s 62"s 56"W 20°W ... Parallel 2 Meridian Projection Shift Scotia Sea WGS84 Metres 54"30'S 59"30fS 40°W 62"W 0, 0 Antarctic ... required to sample two stations, one station would be sampled around local midnight, the other around ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 1–23 : Autor(es): Trathan, P.N., J.L. Watkins, A.W.A. Murray, A.S. Brierley, I. Everson, C. Goss, J. Priddle, K. Reid, P. Ward, R. Hewitt, D. Demer, M. Naganobu, S. Kawaguchi, V. Sushin, S.M. Kasatkina, S. Hedley, S. Kim and T. Pauly

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

   random variation across years in one of the selectivity function parameters and similarly for the ... model in predicting class/bin by year frequencies is used to obtain a single, across-years, over ... its variants. One of the methods is based on the lack-of-fit of predictions of class probabilities ... parameter. The remaining two estimators based on haul-level frequencies are derived from models for the ... externally via the above method and aver- aged across years to give an updated estimate of n’. This two-step ... sampling of the population age structure. For each of the 20 years in a replicate, catch-at- age ... . These perturbations consisted of either systematic or random variation across years in one of the ... systematic or random variation across years in one of the selectivity function parameters and similarly for ...

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

6. Estimates of fish stock biomass around South Georgia in January/February 1985

   reduction in stock size to 10 – 20% of that estimated before the onset of heavy fishing. In C. gunnari the ... fishery is dependant on the abundance of the recruiting year class. Conservation measures adopted by ... recruitment of one or two abundant year - 9 - classes. The dependance of the fishery on the a bund ance ... & BUREAU, 1984, table 50). 3.4 Champsocephalus gunnari Except for one haul yield i ng 1. 4 t/30 min ... catche s (fig. 13). fa 1975/76 and 1977/78 catches consisted mostly of individuals of 50-80 cm. Stock ... direc- t ed fishing for the species for two years on the premises of a normal recruit- ment. Minimum ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 1-32 : Autor(es): Kock, K.-H.

7. Beyond MSY: a consideration of definitions of management objectives

   Article II of the CCAMLR Convention. The criteria will depend on whether the main concern is with ... be met by taking an amount R-S t' so that the escapement (i.e. recruitment op less catch) will ... natural mortality coefficients, and as function of the two main characteristics of the fishery - the age ... yield that can be sustained is one corresponding to full exploitation of the weaker year-classes ... nominal effort each year, based on the values of F and fishing effort in the most recent years. Since ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 299-322 : Autor(es): Gulland, J.A.

8. Midwater trawl catchability as an aspect of a quantitative assessment of krill biomass conducted using a trawl census survey

   . It could be proven that with two trawls operating in the same area, one could expect the coefficient ... , document, WG-Krill-90/20. SIEGEL, v. 1982. Investigation on Post Spawning Concentration of the Antarctic ... swann depth (metres) 42 29 41 24 29 25 30 21 cr, swann depth 13 20 13 8 10 14 16 8 Mean swann ... 47 59 30 23 20 29 17 cr, mean swann length (metres) 15 16 19 7 10 7 20 4 Swann density field in ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 257–272 : Autor(es): Kasatkina, S.M.

9. Detection and quantitative estimation of krill concentrations by hydroacoustic instruments

   2.107 L 1----. .1- _______ . __ .... __ . ___ _ 30 35 'ID so Figure 1 60 70 80 90 tDO ·120 ISO ... transmitter frequency. Thus, echo sounders operating at comparatively low frequencies (20-30 kHz) are much ... . Investigations over many years have proved that krill disperses extremely non-uniformly over vast areas in the ... different years and seasons. In the same area at different times, krill can form large concentrations in ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 123-139 : Autor(es): Yudanov, K.I.

10. A post-processing method to remove interference noise from acoustic data collected from Antarctic krill fishing vessels

    –60 –40 –20 Sv (dB) 0 5 10 15 20 -100 -90 -80 ... -70 -60 -50 Ping number M VB S /d B re 1m b –50 –60 –70 –80 –90 –100 M V B S (d B ... ed d at a at 1 20 k H z. S ta tis tic al v al ue s ar e re pr es en te d by 2 ... (d) 38 kHz (e) 70 kHz (f) 120 kHz -80 -74 -68 -62 -56 -50 -44 S v/d B re 1 m –1 ...

    Science Journal Paper : CCAMLR Science, Volume 23 (CCAMLR Science, Volume 23) : 17–30 : Autor(es): Wang, X., J. Zhang and X. Zhao

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