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Modelling krill recruitment
observed values of the mean proportion of recruits and its variance to model recruitment in a krill ... population in terms of numbers of recruits. The method includes the calculation of natural mortality and ... for generating families of recruitment functions which are consistent with the statistical uncertainty ... : Modelling Krill Recruitment from which it follows that: where At is the average number of recruits to be ... , Australia Abstract A method is developed for using observed values of the mean proportion of recruits ... and its variance to model recruitment in a krill population in terms of numbers of recruits. The ... method includes the calculation of natural mortality and other parameters consistent with the observed ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 49–54 : Autor(es): W.K. de la Mare
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Editorial
total of 167 working papers were presented at these meetings. This volume consists of papers submitted ... 17th volume of CCAMLR Science and the contents reflect the diverse science that supports CCAMLR’s ... management of the marine living resources of the Southern Ocean. There is a truly circumpo- lar feel to this ... volume with papers using data from the Pacific, Indian and Atlantic sectors of the CAMLR Convention Area ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 243
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From the Editor
. Available online at www.ccamlr.org/ pu/e/e_pubs/cm/07-08/toc.htm. Comment policy of CCAMLR Science CCAMLR ... for the total biomass of krill, esti- mated using data collected during the CCAMLR- 2000 Survey ... , represent two of the estimates availa- ble. As the exchange reflects, there are a number of ways in which ... such estimates can be derived and CCAMLR recognises the importance of consider- ing all plausible ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 199
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Commercial fishing vessels as research vessels in the Antarctic – requirements and solutions exemplified with a new vessel
in the ecosystems of the Antarctic region require a precautionary approach with respect to the human ... use of these ecosystems. In particular, resource harvesting requires enough basic knowledge, as well ... ecosystem. Due to the vastness and remoteness of the Antarctic region, research vessel capacity is not ... readily available for conventional coverage of harvested stocks and their ecosystems. This paper describes ... CCAMLR- approved estimate of biomass in this sector now stands at just over 60 million tonnes (Demer and ... side of the ship to measure water column environmental properties, and collect water samples at ... use of multiple-frequency tech- niques for species identification at greater depths. Most importantly ... The Antarctic region is vulnerable to human activity. In particular, under the impact of global ...
Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 11–17 : Autor(es): Godø, O.R., C. Reiss, V. Siegel, J.L. Watkins
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Alternative methods for determining subarea or local area catch limits for krill in Statistical Area 48
application in future of precautionary limits to subareas or local areas of this area. Nine alternative ... methods of determining subarea or local area krill catch limits are evaluated relative to six criteria: (i ... ) the degree to which information on biological relationships is considered; (ii) the cost of data ... collection; (iii) the reliability of required information; (iv) the ease of enforcement; (v) the effects on ... international consensus at each meeting of the Commission). Pulse fishing would alter current fishing patterns ... range of krill densities). It may take several years to arrive at a preliminary understanding of how ... (Euphausia superba) in Statistical Area 48. The measure also implies an application in future of ... precautionary limits to subareas or local areas of this area. Nine alternative methods of detennining subarea ...
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
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Catch per unit effort and proportional recruitment indices from Japanese krill fishery data in Subarea 48.1
period. The use of different fishing strategies in response to a demand for higher product quality and a ... between environmental factors and krill variability was one of the major issues addressed at CCAMLR's ... . Kawaguchi, T. Ichii and M. Naganobu National Research Institute of Far Seas Fisheries 5-7-1 Orido ... period. The use of different fishing strategies in response to a demand for higher product quality and a ... recruitment of krill in the Elephant Island area was presented by Siegel and Loeb (1995). A preliminary ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 47–63 : Autor(es): Kawaguchi, S., T. Ichii and M. Naganobu
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Note on estimating krill abundance from acoustic data on individual aggregations
Abstract / Description: The fundamental equations and assumptions underlying estimation of krill abundance ... differences of the two approaches are highlighted. It is concluded that the echo-integration approach is ... superior for the estimation of regional krill abundance and its variance since it is easier to apply ... (h k )/, the vertical limits of the aggregation at that point, and nk is the number of pings ... equations and assumptions underlying estimation of krill abundance using echo-integration information and ... aggregation parameters are briefly described. The chief differences of the two approaches are highlighted ... . It is concluded that the echo-integration approach is superior for the estimation of regional kriU ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 219–223 : Autor(es): Hampton, I. and D.G.M. Miller
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The 1991/92 fishery for Dissostichus eleginoides in Subarea 48.3
November 1991 to 10 March 1992. A total of 3 382 tonnes was taken by one Bulgarian, five Russian and eight ... influenced by fishing depth, time of day or soak time, but was dependent on type of hook and geographical ... position. Fish caught around Shag Rocks were larger than to the north and southeast of South Georgia. CPUE ... 0.2 in the Bulgarian. These differences were probably a result of the different hook types used by the ... 20 to 25 mm (Moreno, 1991)]; • Type 11 - hooks slightly recurving at the barb and twisting out of a ... exploited by the Chilean fleet), at similar depths over similar times, but the line characteristics of the ... Dissostichus eleginoides in Subarea 48.3 was open from 4 November 1991 to 10 March 1992. A total of 3 382 ... five-day period was 375 tonnes. Catch rate was not influenced by fishing depth, time of day or soak ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 31–48 : Autor(es): Agnew, D.J. and C.A. Moreno
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Survey design to estimate krill abundance during FIBEX
of the primary aims of FIBEX (First International BIOMASS Experiment), 1981 was to study the ... methodology for assessing the abundance of krill. The survey design used in the southwest Atlantic study area ... of the FIBEX is described in this paper. Sampling involved the use of echo sounders for estimating ... krill abundance as well as collection of data on the size, density and distribution of krill swarms. In ... for any population, provided of course, that selection of transects is at random within a stratum. A ... survey subarea at the end of the primary phase (after BIOMASS 1980b). Phase 2 transects would be run ... ABUNDANCE DURING FIBEX I. Everson, I. Hampton, G.M. Jolly Abstract One of the primary aims of FIBEX ... of krill. The survey design used in the southwest Atlantic study area of the FIBEX is described in ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 253–263 : Autor(es): Everson, I., I. Hampton and G.M. Jolly
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Krill (Euphausia superba Dana) resources and distribution in the Wilkes Land area in the seasons 1986 to 1989
the seasons 1986 to 1989 Abstract / Description: Results of krill (Euphausia superba Dana) resource ... account an area to the north of the edge of the continental slope. Each subarea was described in terms of ... the number of krill aggregations, regularity of their observations, krill density and total krill ... conditions and extent of the ice cover. If ice conditions are favourable, the subarea between 143° and 150°E ... biomass of kriU were consistently at their highest during the years of observation (except 1986). The ... V.P.Timonin* Abstract Results of krill (Euphausia superba Dana) resource surveys carried out along the ... the north of the edge of the continental slope. Each subarea was described in terms of the number of ... krill aggregations, regularity of their observations, krill density and total krill biomass. It was ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 149–162 : Autor(es): Dolzhenkov, V.N. and V.P.Timonin