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1. Brief comments on the simulation study made by Professor Butterworth on krill fishing by an individual Japanese trawler

   questions are raised concerning the simulation study of the Japanese krill fishery carried out by ... during FIBEX surveys. Since very little searching time is spent on layers, the utility of searching time ... data appears doubtful. Secondly, the utility of indices based on the sum of primary and secondary ... searching times (PST+SST) is also doubtful because SSTs are markedly dependent upon the type of products ... Abstract In this paper, three essential questions are raised concerning the simulation study of the ... is spent on layers, the utility of searching time data appears doubtful. Secondly, the utility of ... indices based on the sum of primary and secondary searching times (PST +SST) is also doubtful because ... SSTs are markedly dependent upon the type of products being produced, and the demand for each product ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 347–350 : Author(s): Ichii, T. and Y. Endo

2. 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 ... , 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 ... proportional recruitment parameters. A procedure is given for generating families of recruitment functions ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 49–54 : Author(s): W.K. de la Mare

3. Krill population biology during the 1991 Chilean Antarctic krill fishery

   males et de femelles dIE. superba de la zone A. Distribution de frequences de tailles du total des ... tailles de juveniles, de males et de femelles dIE. superba de la zone B. Distribution de frequences de ... B. Distribution de frequences de tailles dIE. superba de jour, en periode de demi- jour et de nuit. Sex ratio ... dIE. superba pendant les trois periodes. Capture totale (tonnes/mille) dans les deux zones pendant ... / Description:  Population biology of Antarctic krill, Euphausia superba, was studied from samples taken in 1991 ... size from 1.5 to 3 cm). Two subsamples of 100 specimens each were taken from 50 samples and analysed ... . The fishing ground was divided into two areas: Area A, north of the South Shetland Islands; and Area B ... , north of Elephant Island. The samples were grouped by time of capture: daytime, twilight and night-time ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 223–235 : Author(s): Mujica R., A., E. Acuña S. and A. Rivera O.

4. Estimating confidence intervals for fish stock abundance estimates from trawl surveys

   estimates of abundance obtained from trawl surveys conducted by means of the swept area method, using ... likelihood ratios from Aitchison's delta distribution. Simulation tests of the method show that unbiased ... estimates of density and biomass can be obtained and that the estimated confidence intervals have close to ... the nominal coverage probability. Performance deteriorates in cases where few of the hauls contain ... calculating asymptotic confidence intervals for estimates of abundance obtained from trawl surveys conducted ... by means of the swept area method, using likelihood ratios from Aitchison's delta distribution ... . Simulation tests of the method show that unbiased estimates of density and biomass can be obtained and that ... deteriorates in cases where few of the hauls contain fish and the coefficient of variation (CV) is high. The ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 203–207 : Author(s): de la Mare, W.K

5. Fish stock assessment survey in Subarea 48.3

   fish survey in the vicinity of South Georgia, CCAMLR Subarea 48.3, is described. Details are given of ... positions of hauls, catch rates and size composition of catches. The standing stock of one of the most ... Abstract A demersal fish survey in the vicinity of South Georgia, CCAMLR Subarea 48.3, is described ... . Details are given of positions of hauls, catch rates and size composition of catches. The standing stock ... of one of the most important commercial species in the area, Champsocephalus gunnari, is shown to ... . 1. INTRODUCTION The fish stocks in Subarea 48.3, South Georgia, have been the subject of ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 25–67 : Author(s): Everson, I., G. Parkes, K.-H. Kock, S. Campbell, Z. Cielniaszek and J. Szlakowski

6. 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 ... (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 ... 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 current fishing ...

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

7. Trawl bag selectivity in the Champsocephalus gunnari fishery

   , 5IBJI5IIO~HMHC5I lIaCTblO OCHOBHOti npOf'paMMbI 6HOJIOf'HlIeCKHx H OKeaHHlIeCKHX HCCJIe,l{OBaHHti, 6bIJIH ... :  Experiments on trawl bag selectivity during fishing on pre-spawning concentrations of Champsocephalus gunnari ... were carried out in June 1990 in the South Georgia area concurrently with trawl surveys as part of the ... and the selectivity factor was 3.10 for a mesh size of 80 mm. Comparison of these results with results ... cm) as well as earlier sexual maturation of fish were noted. It was suggested that the use of Polish ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 295–312 : Author(s): Bidenko, V.G. and I.G. Istomin

8. Seabird interactions with trawl and longline fisheries for Dissostichus eleginoides and Champsocephalus gunnari

   and Champsocephalus gunnari Abstract / Description:  The behaviour of seabirds and the rate of ... trawlers was of white-chinned petrels, with a lesser mortality of albatross species. Mortality rates ... , probably because the birds at the former site are distracted from the longlines by the discharge of offal ... from the side of the vessel opposite to where the longline is set.   File:  06williams-capdeville.pdf ... of seabirds and the rate of incidental mortality were observed during commercial trawling operations ... associated with both longliners and trawlers was of white-chinned petrels, with a lesser mortality of ... longlines by the discharge of offal from the side of the vessel opposite to where the longline is set. Le ... same period with catches taken by a mixture of longlining (12%) and trawling (88%). A trawl fishery ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 93–99 : Author(s): Williams, R. and D. Capdeville

9. Refinements to the strategy for managing depleted fish stocks based on CCAMLR objectives

   objectives Abstract / Description:  A method of calculating fishing mortalities which will allow depleted ... decades is illustrated. These fishing mortalities are based on probabilistic descriptions of the future ... states of a depleted stock, and take into account uncertainty in assessments. Sample calculations show ... that applying a policy of F 0.1 will not always lead to stock recovery in two to three decades, and ... A method of calculating fishing mortalities which will allow depleted fish stocks to recover to ... fishing mortalities are based on probabilistic descriptions of the future states of a depleted stock ... , and take into account uncertainty in assessments. Sample calculations show that applying a policy of ... management policies are required for depleted stocks. The implications of these studies for defining the ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 467–475 : Author(s): de la Mare, W.K. and A. Constable

10. The fishery for Patagonotothen brevicauda guntheri in CCAMLR Subarea 48.3

    / Description:  Fine-scale data supplied to CCAMLR for 1987/88 showed that the catches of P atagonotothen ... only ever caught at Shag Rocks. Therefore the South Georgia catches were almost certainly of another ... species. The small size of P.b. guntheri means that they can only be caught with net meshes so small that ... they would also catch undersized individuals of other, larger species. Survey results suggest that such ... CCAMLR for 1987/88 showed that the catches of Patagonotothen brevicauda guntheri were five times greater ... . Therefore the South Georgia catches were almost certainly of another species. The small size of P.b ... individuals of other, larger species. Survey results suggest that such fishing is likely to have a ... significant effect on other species. P.b. guntheri has been reported as a by-catch of other fisheries; this ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 275–283 : Author(s): Everson, I. and C. Mitchell

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