Search results
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Hydrological conditions and characteristics of icefish (Channichthyidae) distribution on the South Georgia shelf in 1986/87
Paper Title: Hydrological conditions and characteristics of icefish (Channichthyidae ... ) distribution on the South Georgia shelf in 1986/87 Abstract / Description: Some characteristics of spatial and ... temporal variability of the distribution of icefish (Channichthyidae) on the South Georgia shelf in ... relation to environmental conditions have been revealed from summaries and analyses of hydrographic ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 3–14 : Author(s): Shnar, V.N. and V.I. Shlibanov
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Environment–krill relations in the South Georgia marine ecosystem
that there was substantial variability in both Z-ATs and M-ATs. There were indications of long-term change in both ... between the M-ATs at 50"s (M26, M27, Figure 1) and the ice-edge position. However, there were consistent ... of southerly M-ATs in the area of the Weddell outflow region during the autumn-winter months (May-July ... study, time series of krill abundance (CPUE) indices were derived from Soviet fishing operations in the ... atmospheric components of the system, and there are also correlations with CPUE data. The CPUE index generally ... agrees with other data which give direct or indirect indications of krill availability, suggesting it can ... were only expressed strongly in years of extreme conditions. The correlation with water temperature was ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 13–30 : Author(s): Fedoulov, P.P., E. Murphy and K.E. Shulgovsky
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Spatially explicit population dynamics models for Antarctic toothfish in the Ross Sea region
that constrain the param- eterisations. This resulted in three plausible oper- ating models (see ‘Spatial ... - ating model estimated values of initial recruit- ment that were biased low by 17%; and the semi ... in dispersion in the restricted oper- ating model. However, only 100 simulations were used (due ... dynamics of spatial heterogeneity of the population along with age structure, movement and reproductive ... region and used as operating models to evaluate the performance of single-area assessments. The models ... shapes of the preference functions were established through iterative model testing whilst the parameters ... defining the preference functions were estimated within each model. The spatial structure of the models ...
Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 19–37 : Author(s): Mormede, S., A. Dunn, S. Hanchet and S. Parker
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Precautionary measures for a new fishery on Martialia hyadesi (Cephalopoda, Ommastrephidae) in the Scotia Sea: an ecological approach
, Ommastrephidae) in the Scotia Sea: an ecological approach Abstract / Description: In anticipation of the ... development of a new fishery for the ommastrephid squid Martialia hyadesi in the Scotia Sea, this paper ... presents a revision of annual consumption of the species by higher predators and provides a brief review of ... information about the life cycle and distribution of the species obtained from research fishing and commercial ... exploratory survey in the vicinity of South Georgia, Shag Rocks and at the Antarctic Polar Frontal Zone ... (APFZ) west of South Georgia, and caught about 8 tonnes, all at the APFZ (Rodhouse, 1991). In ... (grey-headed albatrosses feeding chicks at Bird Island, South Georgia) to the APFZ north of South ... with about 60 000 tonnes of I. argentinus. In February 1996 another BAS research cruise at South ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 125–139 : Author(s): Rodhouse, P.G
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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 ... ) . 2. SURVEY AREA AND DESIGN The survey was aimed at providing information representative of the ... total of 66 sites was fished at South Georgia and 12 at Shag Rocks. The locations of the sites actually ... representative of a station within each depth stratum and at each location is shown in Table 2. 26 A ... species that migrate off the bottom at night. 3. DESCRIPTION OF VESSEL AND SAMPLING METHODS A stern ...
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
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An impact assessment framework for bottom fishing methods in the CAMLR Convention Area
as equivalent to ‘vulnerable biogenic habitat’, i.e. slow-growing sessile benthic organisms that cre- ate three ... the logic by which those ratings were gener- ated, such that conclusions become difficult to test ... preliminary assessment of bottom fishing impacts for the 2008/09 toothfish longline fishery. This paper ... illustrates the utility of the standardised approach and provides a methodological template for systematic ... necessary component of a full ecological risk assessment. File: 10sharp-et-al.pdf ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 195–210 : Author(s): Sharp, B.R., S.J. Parker and N. Smith
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Fish distribution and biomass in the Heard Island zone (Division 58.5.2)
/ Description: Division 58.5.2 encompasses the southern part of the Kerguelen plateau, and contains Heard ... . In order to assess the potential of this area for commercial fishing, and to obtain some preliminary ... distribution, abundance and biology of the most important species, covering a number of years and seasons. Five ... species were found to be abundant. There were two consistent areas of aggregation of Champsocephalus ... and size of the net mouth, temperature and depth at the headline and confirmation that the net was ... were chosen at random by computer, with the minimum distance between sites of 5 n miles. For each ... stratum, GR500, at 300-500 m depth was established around GR300 to allow for the presence of C. gunnari ... at this depth; * the 750 stratum was not sampled because of lack of time and the low densities of ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 1–20 : Author(s): Williams, R. and W.K. de la Mare
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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 ... probability of 0.5 that the stock is at or above GNAI (or other target level) in 20 years; (ill) the ... of the state of the stock at a given time in the future could be done with population projections ... distribution at year 20 is the sum of the projected distributions, for the set of current stock states in the ... examined, one with the population at 30% of average pre-exploitation biomass, and the other at 5%. GNAI is ...
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
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Phytoplankton distribution in the mixed layer: implication to krill abundance
Abstract / Description: A one dimensional Lagrangian model of random walk is presented to study the ... distribution of phytoplankton in the Antarctic Ocean. Since little is known about mixed layer dynamics in the ... Antarctic Ocean, we estimate the depth of the mixed layer and its turbulence intensity from an Ekman layer ... . However, the effect on the dynamics is vital, affecting the distribution of particles in the upper ocean ... pycnocline near 40 m in STD237 shows a high buoyancy frequency, N, as is often found at the base of mixed ... , f the Coriolis parameter and p the density of water. Turbulence observations at mid-latitudes for ... at 61°S and the profiles are terminated at the depth of Ekman layer. The dissipation rate decreases ... Pisces submersible show the suppression of vertical velocities at scale larger than Lo. The turbulence ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 331–356 : Author(s): Yamazaki, H. and T.R. Osborn
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Fishing ground selection in the Antarctic krill fishery: trends in patterns across years, seasons and nations
, beginning operations late in the 1999/2000 fish- ing season. For the first two seasons, it only oper- ated ... that fishing fleets tend to oper- ate in the areas where they know through their experience and external ... with high CPUEs. Although it must be accepted that the decision ‘where to oper- ate’ involves ... years, seasons and nations Abstract / Description: Patterns of fishing ground selection were ... remained relatively constant in Subareas 48.2 (March–May) and 48.3 (June–August). In 25 years of krill ... operations in Area 48, patterns of SSMU usage have changed. Three different patterns of seasonal SSMU ... of high krill density observed by scientific surveys, and possible reasons for this mismatch are ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 117–141 : Author(s): Kawaguchi, S., S. Nicol, K. Taki and M. Naganobu