Résultats de la recherche
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The error of the biomass estimate as a function of survey parameters and the statistics of a density field of krill aggregations
Paper Title: The error of the biomass estimate as a function of survey parameters and the ... statistics of a density field of krill aggregations Abstract / Description: Simple relationships expressing ... the dependence of relative sampling error in a biomass estimate (from a survey) on the statistical ... characteristics of the fish concentration density field and on parameters of the survey itself, have been derived ... relationships Let ue at first confine to the easiest and most widespread method of e9timating biomass 8 in a ... fields Let us at first assume that field .f (X~~) is an isotropic one~ This ie typical of ... .ii =0) t and at i =J j all values of A ('Zz,j) are practically zero, so from (4) we obtain: (5 ... integral of AT over correlation radius, we obtain out of (1) and (4) : Since estimate of average density ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 213-228 : Auteur(s): Kizner, Z.I.
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Revised estimates of seabed areas within the 500 m isobath of the South Orkney Islands (subarea 48.2) and consequences for standing stock biomass estimates of nine species of finfish
Paper Title: Revised estimates of seabed areas within the 500 m isobath of the South Orkney ... Islands (subarea 48.2) and consequences for standing stock biomass estimates of nine species of finfish ... Abstract / Description: A revised bathymetric map of the South Orkney Islands (Subarea 48.2) was generated ... , areas of seabed within the 500 m isobath (i.e. 0-500 m) were computed for 50 m depth intervals. Areas ... . These databases were then used to compute bathymetric surface areas of seabed at 50 m intervals within ... range of each particular species. Given the significant increases in estimated seafloor at greater ... REVISED ESTIMATES OF SEABED AREAS WITHIN THE 500 M ISOBATH OF THE SOUTH ORKNEY ISLANDS (SUBAREA 48.2) AND ... CONSEQUENCES FOR STANDING STOCK BIOMASS ESTIMATES OF NINE SPECIES OF FINFISH C.D. Jones National Oceanic ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 197–204 : Auteur(s): C.D. Jones
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A preliminary investigation of the possible effects of rhizocephalan parasitism on the management of the crab fishery around South Georgia
Paper Title: A preliminary investigation of the possible effects of rhizocephalan parasitism on ... the management of the crab fishery around South Georgia Abstract / Description: Relatively high ... levels of infection by a rhizocephalan barnacle have been found in the population of the crab Paralomis ... spinosissima, which has been harvested by a new fishery around South Georgia (Subarea 48.3) since 1992. One of ... aimed at capturing the main characteristics of the system under consideration: the fishery for P ... development involves the eruption of 'externa'. Some related species of rhizocephala are known to require at ... reference to suggest what the life-span of the parasite is likely to be, but at the one extreme a parasite ... validity of this assumption depends on whether the size at morphometrical maturity can be assumed to be ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 175–192 : Auteur(s): Basson, M
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Optimization of survey sampling design in the detection of interannual variability and prey size selectivity in the diet of penguins
the optimal allocation of observations at each level in nested ANOVA designs. The optimal numbers of ... errors fixed at 0.1. Cost values of manpower required are based on Argentinian logistics. File: 34 ... Paper Title: Optimization of survey sampling design in the detection of interannual variability ... and prey size selectivity in the diet of penguins Abstract / Description: Based on the preliminary ... penguin size-related selectivity were analyzed in order to find the optimal allocation of observations at ... allocation of observations at each sampling level. Noting that penguin selectivity not only might affect ... PENGUINS At the 1989 Meeting ofWG-CEMP, the desirable minimum size of changes to be detected was set at ... costs of sampling at each level, it is possible to define a sampling protocol achieving the desired ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 551–559 : Auteur(s): Marschoff, E. and B. Gonzalez
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Use of the Leslie stock depletion model for the assessment of local abundance of Patagonian toothfish (Dissostichus eleginoides)
in localised areas for periods of at least three days. The results suggest that there is greater ... Paper Title: Use of the Leslie stock depletion model for the assessment of local abundance of ... toothfish (Dissostichus eleginoides) around South Georgia and the Pacific coast of Chile. This paper ... presents a re-working and synthesis of previous analyses to examine whether declines in CPUE can be ... against cumulative catch, when single vessels operate in localised areas for periods of at least three ... are indications of significant levels of unreported catch from Subarea 48.3. At its 1995 meeting the ... attempted to assess the status of the toothfish fishery in Subarea 48.3 at its annual meetings since the ... showing locations of fishing grounds at which the data for this study were collected. Assessment of ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 55–77 : Auteur(s): Parkes, G., C.A. Moreno, G. Pilling and Z. Young
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Preliminary results of investigations of the Federal Republic of Germany on Notothenia rossii marmorata (Fischer, 1885) in January/February 1985
since 1981/82 and is still close to length at sexual maturity. The major part of the population ... Paper Title: Preliminary results of investigations of the Federal Republic of Germany on ... further basic data needed for stock assessment purposes, to assess the actual size of Notothenia rossii ... probably still less than 10% of the pristine stock, Mean length in the catches has only slightly increased ... and is still close to length at sexual maturity. The major part of the population consisted of age ... isLmds of the Scotia arc (FREYTAG, 7980). Before the onset ot large scale commercial exploitation at ... - cruitment to the offshore pur.t of the population slarts at about 35 cm although few individuals less than ... ::,e size at first cc.pLure. The 50 % retention length of 160 Hllll mesh size, ho1-1ever, is probably ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 33-57 : Auteur(s): Kock, K.-H.
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The use of analysis of penguin stomach contents in simultaneous study of prey and predator parameters
samples from the same penguin or studying portions of stomach samples at different stages of digestion are ... Paper Title: The use of analysis of penguin stomach contents in simultaneous study of prey and ... predator parameters Abstract / Description: Size selectivity of krill by penguins is shown to be highly ... sensitive to the statistical assumptions made during the analysis of data. The nested ANOVA method is ... penguin or studying portions of stomach samples at different stages of digestion are proposed as ... 2). At this stage it seems reasonable to assume that the question of size selectivity of krill by ... within dates" component is, at least partially, a consequence of patch distribution of krill. A fraction ... to interpret because the distribution of penguins at sea is basically non-random. The proposed ...
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
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A functional division of Electrona carlsbergi (Tåning, 1932) area of habitat in relation to the latitudinal zonation of the Southern Ocean
Paper Title: A functional division of Electrona carlsbergi (Tåning, 1932) area of habitat in ... relation to the latitudinal zonation of the Southern Ocean Abstract / Description: During the cruise of ... Southern Atlantic along two meridional transects at 17° and 20°W in the latitudes from 37°30' to 55°30 ... 'S. The survey was mainly focussed on studies of distribution of adult and pre-spawning Electrona ... ; Lutj eharms , 1985; Lutjeharms and Foldvik, 1986) points at circumpolar distribution of STFZ (with the ... °S at 17°W. Moreover, an anticyclonic meandering current on the southern boundary of the STFZ (or a ... gyre formed in this frontal area) has been identified along the transect of 200W at 44° to 45°S. The ... northern boundary of the PFZ (Sub-Antarctic Front) at 200W was located between 48° and 48°30'S. At 17°W ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 369–395 : Auteur(s): Zemsky, A.V. and S.A. Zozulya
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Results of Soviet investigations of the distribution and ecology of pelagic squids (Oegopsida) in the Southern Ocean
total of 326 squid specimens were collected at 124 stations with sampling by midwater nets. 125 ... Paper Title: Results of Soviet investigations of the distribution and ecology of pelagic squids ... of the distribution and ecology of pelagic squids (Oegopsida) in the Southern Ocean. In 1965–1977 a ... specimens of that total were identified as Brachioteuthis riisei. In recent years (1978-1984) the collection ... -1977 a total of 326 squid specimens were collected at 124 stations with sampling by 1nidwater nets ... specimens of Antarctic Squids were collected at 124 stations with midwater hauls in the Southern Ocean ... species into the productive areas of the temperate vatere of the boreal and notal zones. At the same ... the modern continents of South America, Australia and Antarctlea. At that time, the continent was ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 79-111 : Auteur(s): Lubimova, T.G.
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Size compositions of males and females in the course of the life cycle of Euphausia superba
Paper Title: Size compositions of males and females in the course of the life cycle of Euphausia ... of Euphausia superba populations by sex and its seasonal variability. In this paper variations in ... size and sex composition of samples from commercial catches are analyzed over the reproductive season ... , using samples from different years. The observed variations were related to stages of krill maturity ... observations revealed considerable variations in relative size of males and females at different reproductive ... catches in different seasons and areas were analyzed for size of males and females at different stages of ... non-mature or at the beginning of maturation (lIB, ma-me); B ready for spawning with developed ... usually made it possible for the sex of larvae at stages Furcilia V and VI to be determined. Larvae were ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 3–16 : Auteur(s): Makarov, R.R.