Résultats de la recherche
-
The use of analysis of penguin stomach contents in simultaneous study of prey and predator parameters
Paper Title: The use of analysis of penguin stomach contents in simultaneous study of prey and ... found in the stomach of a given penguin prevents the pooling of krill lengths from different samples ... sensitive to the statistical assumptions made during the analysis of data. The nested ANOVA method is ... proposed as being the correct approach for analysis because lack of independence between krill specimens ... estimate the mean size of krill which in turn, was tested against the variance of the pooled samples ... . The regression analysis demonstrates a positive trend in mean sizes of krill with time (Table 4 and ... for analysis because lack of independence between krill specimens found in the stomach of a given ... penguin prevents the pooling of krill lengths from different samples. Samples taken in Bahfa Esperanza ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 367–375 : Auteur(s): Marschoff, E. and B. González
-
Further computations of the consequences of setting the annual krill catch limit to a fixed fraction of the estimate of krill biomass from a survey
relate potential krill yield to a pre-exploitation survey estimate of krill biomass. In this paper, the ... Paper Title: Further computations of the consequences of setting the annual krill catch limit to ... a fixed fraction of the estimate of krill biomass from a survey Abstract / Description: Butterworth ... et al. (1992) put forward an extension of the harvesting model of Beddington and Cooke (1983) to ... -exploitation survey estimate of krill biomass. In this paper, the approach is extended further so as to ... Meeting, results in marked reductions in the probabilities of krill spawning biomass falling below ... summary of the implicat ions of the analysis calculations for the parameter h in the yield (SC-CAMLR ... growth curve of Rosenberg et al. (1986): where P, = 60 mm p = 0.45 yr-' a is the age of the krill in ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 81–106 : Auteur(s): Butterworth, D.S., G.R. Gluckman, R.B. Thomson, S. Chalis, K. Hiramatsu and D.J. Agnew
-
Krill fishing in the Scotia Sea in relation to bathymetry, including the detailed distribution around South Georgia
mainly in shelf and shelf-break areas on the northern side of the Scotia Arc. Regional analyses reveal ... trawl statistics have been recorded in the South Georgia area. Analyses of these data show marked ... interannual variability in the distribution of trawls. The data for 1993 were only available from August but ... the fishery was restricted in that period to an area on the western edge of the shelf break where ... ) individual trawl statistics have been recorded in the South Georgia area. Analyses of these data show marked ... interannual variability in the distribution of trawls. The data for 1993 were only available from August but ... the fishery was restricted in that period to an area on the western edge of the shelf break where ... valleys. The results are discussed in relation to the ecology of krill and the fishery's interaction with ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 1–17 : Auteur(s): Murphy, E.J., P.N. Trathan, I. Everson, G. Parkes and F.H.J. Daunt
-
Krill (Euphausia superba Dana) resources and distribution in the Wilkes Land area in the seasons 1986 to 1989
regularly observed in the subarea. The mean annual density of krill in the subarea was 1 475 tonnes per ... account an area to the north of the edge of the continental slope. Each subarea was described in terms of ... square mile. The total biomass of krill in the Wilkes Land area was assessed as being about 1x10 6 ... Paper Title: Krill (Euphausia superba Dana) resources and distribution in the Wilkes Land area in ... regularly observed in the subarea. The mean annual density of krill in the subarea was 1475 tonnes per ... the north of the edge of the continental slope. Each subarea was described in terms of the number of ... square mile. The total biomass of krill in the Wilkes Land area was assessed as being about 1x1()6 ... concentrations in the Pacific Ocean and in the East Indian Ocean sectors of Antarctic waters have been ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 149–162 : Auteur(s): Dolzhenkov, V.N. and V.P.Timonin
-
A review of the effectiveness of streamer lines as a seabird by-catch mitigation technique in longline fisheries and CCAMLR streamer line requirements
streamer line; requiring that individual branched streamers extend to the water in the absence of wind and ... plastic tubing as a permitted streamer material; relaxing the number and placement of swivels in favour of ... Paper Title: A review of the effectiveness of streamer lines as a seabird by-catch mitigation ... large degree on the precedent set by CCAMLR in 1991, the streamer line has become the primary, and most ... should be of the highest priority in order to achieve seabird conservation in world longline fi sheries ... heights of less than 6.1 m. Given these observations, the 4.5 m height requirement in Conservation ... water within 8 m or less of the stern, Conservation Measure 25-02 (2002) could be ineffective in ... lacking and should be of the highest priority in order to achieve seabird conservation in world longline ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 189–201 : Auteur(s): Melvin, E.F., B. Sullivan, G. Robertson and B. Wienecke
-
Simulation of recovery rates of fish stocks in the South Georgia and Kerguelen Islands areas
Paper Title: Simulation of recovery rates of fish stocks in the South Georgia and Kerguelen ... rebuilding of the depleted stocks and improvement in yields. It is desirable that such measures be based on ... average, with the past observations. The simulations may prove useful in comparing observed performance of ... Islands areas Abstract / Description: The benefits of conservation measures are generally based on the ... age and average size in numbers of recruitment for each species. The arithmetic mean of the size of ... ) SIMULATION OF RECOVERY RATES OF FISH STOCKS IN THE SOUTH GEORGIA AND KERGUELEN ISLANDS AREAS R.C ... generally based on the rebuilding of the depleted stocks and improvement in yields. It is desirable that ... in comparing observed performance of regulations to the expected outcomes from the simulations ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 229-298 : Auteur(s): Hennemuth, R.C., K.D. Bisack and G. Duhamel
-
Changes in biomass of eight species of finfish around the South Orkney Islands (Subarea 48.2) from three bottom trawl surveys
Paper Title: Changes in biomass of eight species of finfish around the South Orkney Islands ... Germany in 1985, Spain in 1991 and the USA in 1999. From these surveys, estimates of total stock biomass ... were computed for the eight species of finfish which were most abundant in catches. Biomass levels and ... /90. The biomass of several species of finfish has been monitored through scientific bottom trawl ... the 500 m isobath of the South Orkney Islands, most recently by the Federal Republic of Germany in ... 1985, Spain in 1991 and the USA in 1999. From these surveys, estimates of total stock biomass were ... computed for the eight species of finfish which were most abundant in catches. Biomass levels and size ... within a few years (Figure 1). Catches increased slightly in the mid-1980s, primarily as a result of ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 53–74 : Auteur(s): Jones, C.D., K.-H. Kock and E. Balguerías
-
Interactions of Patagonian toothfish fisheries with killer and sperm whales in the Crozet Islands Exclusive Economic Zone: an assessment of depredation levels and insights on possible mitigation strategies
Paper Title: Interactions of Patagonian toothfish fisheries with killer and sperm whales in the ... pods were involved in 81.3% of the interactions. Significant variations of interaction rates with ... % respectively of the 4 289 hauled lines. It was estimated that a total of 571 tonnes (€4.8 million) of ... whales were found to be responsible for the largest part of this loss (>75%), while sperm whales had a ... when the fishery is closed in the Kerguelen EEZ because of seabird conservation measures. A fishing ... absence (CPUEabs) and in the presence of cetaceans (CPUEpres) was estimated. This provided a mean loss ... cetaceans, and IJ is the number of com- binations of lines used to calculate the mean loss of CPUE in each ... cell c. To obtain the amount of toothfish lost to depre- dation in each cell (Bloss c), the mean loss ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 179–195 : Auteur(s): Tixier, P., N. Gasco, G. Duhamel, M. Viviant, M. Authier and C. Guinet
-
Analysis of variability of krill size and fish by-catch in the Japanese krill fishery based on scientific observer data
Paper Title: Analysis of variability of krill size and fish by-catch in the Japanese krill ... variability in the size structure of the krill population, which is presumably derived from large variability ... size of scientific observer data collected on Antarctic krill commercial fishing vessels, the ... Bayesian model. The models were composed of multistage cluster units (i.e. year, subarea, vessel, cruise ... mean krill length at subarea j in year i; μ is grand mean of krill length in the whole study area ... ) ( )2~ N 0,ik YVλ σ (8) ( )2~ N 0,ikl Hω σ (9) where ijklY is the mean krill length in haul l of ... mean number of by-catch fish at subarea j in year i; μ' is the grand mean of the log-transformed ... a mean of zero and a large variance term (10 000 in this model). α'i, β'j and γ'ij represent the ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 31–47 : Auteur(s): Okuda, T. and M. Kiyota
-
Evaluation of the results of trawl selectivity experiments by Poland, Spain and USSR in 1978/79, 1981/82 and 1986/87
Paper Title: Evaluation of the results of trawl selectivity experiments by Poland, Spain and USSR ... in 1978/79, 1981/82 and 1986/87 Abstract / Description: Trawl selectivity for several species of ... selectivity experiments in Statistical Area 48 in 1978/79, 1981/82 and 1986/87 seasons. These data comprise ... different characteristics of experimental codends, length frequency distribution of stocks sampled, catch ... experiment is not available. Hauls of three hours or more in the second experiment resulted in the mean ... total catches of 0.6 to 1.0 tonnes. Mean catch rate for C. gunnari was 0.75 tonnes/hf. In the Spanish ... of high fishing mortality (Anonymous, 1988). By using the mean SF from the South Georgia area in ... mean SF of 3.5 for C. gunnari and N. gibberifrons, obtained in the first Polish experiment using tape ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 163–196 : Auteur(s): Slosarczyk, W., E. Balguerias, K. Shust and S. Iglesias