Resultados de la búsqueda
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Changes in biomass of eight species of finfish around the South Orkney Islands (Subarea 48.2) from three bottom trawl surveys
the South Orkney Islands (Subarea 48.2) suffered substantial declines from split-year 1977/78 to 1989 ... 3) was 38 900 tonnes (SE = 9 261), with a relatively moderate 95% confidence interval. Although ... commercial fishery during the 1970s and early 1980s. It is unlikely that with 64 hauls we simply missed a ... largely exhausted within two years, and overall catches declined by almost two orders of magnitude ... 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 : Autor(es): Jones, C.D., K.-H. Kock and E. Balguerías
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Use of the Leslie stock depletion model for the assessment of local abundance of Patagonian toothfish (Dissostichus eleginoides)
1989/90. Since then the reported catch has been in the region of 3 000 to 4 000 tonnes, with the ... on the target species is difficult to assess, particularly in the early years of the fishery when ... fishery in Subarea 48.3 include a lack of detailed data from the early years of the fishery, differences ... ) Total Number of Series with Correction Applied 17 5 3 4 0 61 Total Numberof Data Series ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 55–77 : Autor(es): Parkes, G., C.A. Moreno, G. Pilling and Z. Young
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Preliminary results of research activities of RV Evrika in the Scotia Sea in January-March 1988
Sea and adjacent waters, accompanied by regular trawlings with an Isaac-Kidd trawl. The waters off ... -disciplinary survey was conducted of the Scotia Sea and adjacent waters, accompanied by regular trawlings with ... IO)I(HOH reOprHH. 3.lleCb .llOMHHHpOBaJIH OTHOCHTeJIbHO HeOOJIbllIHe paqKH pa3MepOM .llO 35 MM. B ... Georgia and the formation of its stable concentrations (see Figure 3). Waters from the Weddell Sea ... penetrated the eastern part of the area from the east and were characterized by surface temperatures ranging ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 215-229 : Autor(es): Maklygin, L.I., A.S. Fedorov, V.N. Shnar, Yu.A. Shulyakovsky, I.V. Krasovsky, Yu.D. Shuvaev and A.V. Kromsky
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Indices of prey availability near the Seal Island CEMP site: 1990 to 1996
of Elephant Island, and between 25 and l00 m depth. Indices of average prey density agree with ... surveys each year were subsampled to include the foraging range of predators breeding at Seal Island ... relative biomass of juvenile krill near Seal Island during the first survey of each year as compared to the ... biomass of post-spawning adults near Seal Island during the second survey of each year. It is hoped that ... juvenile krill appear in the late spring and early summer and are later displaced by spawning adults ... (Figures 3 and 4). Two surveys were selected for each year, details of which are listed in Table 1. For ... for each year. Designation 3 and 4 D D D D D D Dates 6 - 11 Jan, 21 - 26 Jan 21 - 31 ... 25 and l00 m depth. Indices of average prey density agree with demographic indices of krill ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 37–45 : Autor(es): Hewitt, R.P., G. Watters and D.A. Demer
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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
with the help of mathematical statistics and methods of calculus of probabilities. The biomass estimate ... of the survey with respect to the axis of the correlation ellipse and the frequency of transects ... concentration density field and on parameters of the survey itself, have been derived with the help of ... variation serve as field characteristics on which the error depends. The direction of the survey with ... ecological meaning, it is necessary to supply them with ,confidence intervals indicating the limits of ... possible errors with desired probability. Thus, it is important to find out on whioh parameters of survey ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 213-228 : Autor(es): Kizner, Z.I.
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Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides)
estimated to be from fish 1+ or 2+ years old, with mean total lengths of 32.5 cm and 41.3 cm respectively ... density was distinctly polymodal, to see whether ages estimated by reading otoliths were congruent with ... the length modes observed. Length densities by age were compared graphically with the overall length ... density observed. Additionally, ages were predicted for each fish based on length, and compared with ages ... majority of the otoliths (83.6%) were estimated to be from fi sh 1+ or 2+ years old, with mean total ... shown in Figure 3. The co- horts 0+ to 2+ years corresponded closely to the peaks evident in Figure 2 ... corresponds in toothfi sh at South Georgia. Length-at-age for the cohorts containing fi sh 3+ and 4+ years ... ned as 1+ year old. As in previous years, apart from the dates of the groundfi sh survey, no ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 1–10 : Autor(es): Ashford, J., C. Jones, S. Bobko and I. Everson
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Seasonal and inter-annual variability in the distribution of Electrona carlsbergi in the southern Polar Front area (the area to the north of South Georgia is used as an example)
concentrations throughout the year. Results of surveys showed that the distribution and behaviour of E ... year is related to parameters of spatial and vertical distribution of fish. Interannual variability of ... morning E. carlsbergi forms shoals and later in the day develops more dense concentrations with a ... TpaJIOBbIX H aKycTw·lecKHx CbeMOK B patloHe K ceBepy OT IO)I{HOtl reoprHH Me)l{,lty 49-54° IO.W. H 25-40° 3 ... concentrations. Over many years, the basic biological features, distribution patterns, areas, timing and ... in this area on board RV Vozrozhdenie. They worked for almost two years from October 1987 to June ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 337–367 : Autor(es): Kozlov, A.N., K.V. Shust and A.V. Zemsky
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Results of the CCAMLR Antarctic fish otoliths/scales/bones exchange system
3. Three investigators were experienced (1, 4 and 5) and two (2 and 3) had less experienced with ... 3) were experienced with the species and one was (4) less experienced. Age classes 2 to 12 were ... ) respectively 2: U. Hoffman (GDR) 3: E. 8arrera-Oro (ARG) 4: K.-H. Kock (FRG) not available, lost n r not ... agreement! 1 X 29.0 28.2 10.3 deviation = 1 year (%) 2 76.3 X 48.7 35.1 3 81 .1 89.2 X 59.9 4 66.7 88.5 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 197–226 : Autor(es): Kock, K.-H.
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A first attempt at an assessment of the Patagonian toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands EEZ
combines these IUU catch estimates with legal catches (for calendar years) by South African operators ... Total catches and CPUEs for these two years (Tables 2 and 3) are doubled to refl ect the effects of ... EEZ Figure 3: Population model fi ts and 20-year projections in terms of the exploitable component of ... catch limit and for surveillance are discussed. HISTORY OF THE FISHERY The Fishery In early 1996 ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 11–32 : Autor(es): Brandão, A., D.S. Butterworth, B.P. Watkins and D.G.M. Miller
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Research currently being undertaken by the Republic of South Africa on "dependent and related species" within the Antarctic marine ecosystem
investi':la:te their inte1·action with thei1• environrr,ent. Seals Re,,ea:rch on various ;3-spects of ... deals with selected components of the bloloBicat sciences Prosramme of the South African National ... number <0re st i I I in Pros1·es-s. Re~;earctl Priorities have been set in accordance with those of n ... ~tional and international l'ro'9ramme'S, their obJective-s c:onformin?l with those of the South ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 59-77 : Autor(es): South Africa