Search results
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A review of the trophic role of mesopelagic fish of the family Myctophidae in the Southern Ocean ecosystem
chain. In Antarctic waters, the end product mainly comprises primary predators, i.e. fish ... Paper Title: A review of the trophic role of mesopelagic fish of the family Myctophidae in the ... Southern Ocean ecosystem Abstract / Description: Results of research into the trophic relationships of ... myctophids demonstrate that this group of mesopelagic fish plays a significant role in the community of ... Southern Ocean marine organisms. Myctophids have the trophic status of zooplankton consumers. The large ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 71–77 : Author(s): Kozlov, A.N
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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 ... 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 ... with the help of mathematical statistics and methods of calculus of probabilities. The biomass estimate ... - 213 - SC-CAMLR-VI/BG/39 THE ERROR OF THE BIOMASS ... ESTIMATE AS A FUNCTION OF SURVEY PARAMETERS AND THE STATISTICS OF A DENSITY FIELD OF KRILL AGGREGATIONS ... Z.I. Kizner (USSR) Abstract Simple relationships expressing the dependence of relative sampling ... error in a biomass estimate (from a survey) on the statistical characteristics of the fish ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 213-228 : Author(s): Kizner, Z.I.
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A fine-scale model of the overlap between penguin foraging demands and the krill fishery in the South Shetland Islands and Antarctic Peninsula
Paper Title: A fine-scale model of the overlap between penguin foraging demands and the krill ... fishery in the South Shetland Islands and Antarctic Peninsula Abstract / Description: CCAMLR has been ... using the total catch of krill taken within 100 km of penguin colonies in their breeding season ... (December to March) as an index of overlap between the potential foraging areas of penguins and the ... MODEL OF TlHE OVERLAP BETWEEN PENGUIN FORAGING DEMANDS AND THE KRILL FISHERY IN THE SOUTH SHETLAND ... , Australia Abstract CCAMLR has been using the total catch of krill taken within 100 km of penguin ... colonies in their breeding season (December to March) as an index of overlap between the potential ... foraging areas of penguins and the distribution of the krill fishery in Subarea 48.1 (South Shetland ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 99–110 : Author(s): Agnew, D.J. and G. Phegan
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A preliminary assessment of the stock of the ommastrephid squid Martialia hyadesi in the Scotia Sea based on data from predators
Paper Title: A preliminary assessment of the stock of the ommastrephid squid Martialia hyadesi in ... the Scotia Sea based on data from predators Abstract / Description: Cephalopod fisheries world-wide ... mainly target species from two families, Loliginidae and Ommastrephidae. Fisheries for the latter have ... target species. It is likely, therefore, that exploitation of the sub-Antarctic ommastrephid species ... SC-CAMLR-IX/BG/13 A PRELIMINARY ASSESSMENT OF THE STOCK ... OF THE OMMASTREPHID SQUID MARTIALIA BY ADESI IN THE SCOTIA SEA BASED ON DATA FROM PREDATORS· P.G ... , Loliginidae and Ommastrephidae. Fisheries for the latter have been characterized by dramatically fluctuating ... exploitation of the sub-Antarctic ommastrephid species Martialia hyadesi will be attempted in the future. This ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 479–480 : Author(s): Rodhouse, P.G.
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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
were made only after initial acoustic reconnaissance verified that bottom conditions were suitable ... . As a result, the distribution of P. geovgiaizus was the second most skewed (after L. squamifuons), based ... in mind that the 1985 survey was conducted only a few years after a substantial fishery in the area ... , and fishing was still permitted at the time. The 1991 survey was conducted one year after the closure ... Paper Title: Changes in biomass of eight species of finfish around the South Orkney Islands ... the South Orkney Islands (Subarea 48.2) suffered substantial declines from split-year 1977/78 to 1989 ... /90. The biomass of several species of finfish has been monitored through scientific bottom trawl ... surveys within the 500 m isobath of the South Orkney Islands, most recently by the Federal Republic of ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 53–74 : Author(s): Jones, C.D., K.-H. Kock and E. Balguerías
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Evaluating the impact of multi-year research catch limits on overfished toothfish populations
of lognormal 0.6 Percentage of SSB0 after which recruitment declines 0.2 Natural mortality Mean annual ... -year research catch limits on toothfish populations the end of the projection period to the median un ... were varied to reduce SSB to 10%, 15%, 20%, 25%, 30% and 35% of SSB0 at the end of the 5-year period ... - narios 1 to 6 shown in Table 2, starting in the year immediately after historical overfishing had ceased ... Paper Title: Evaluating the impact of multi-year research catch limits on overfished toothfish ... populations Abstract / Description: In stocks that have been depleted by overfishing, the benefit of ... additional fisheries removals for research purposes needs to be evaluated against the risk that such catches ... may contribute to delaying or preventing the recovery of such stocks. Through simulating a Patagonian ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 47–55 : Author(s): Welsford, D.C
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Timing of clutch initiation in Pygoscelis penguins on the Antarctic Peninsula: towards an improved understanding of off-peak census correction factors
such as photodocu- mentation or sample plots.) At the beginning of the breeding season, penguins arrive, find mates ... . the number of ‘active’ nests at the site) occurs one week after this peak. Note that the peak of egg laying ... , and the maximum census count can occur either slightly before or slightly after the peak of egg laying. Although ... it is generally assumed that census counts after the peak of egg laying are biased downward from the standard ... Paper Title: Timing of clutch initiation in Pygoscelis penguins on the Antarctic Peninsula ... censuses on the Antarctic Peninsula are often subject to logistical challenges that preclude nest counts ... being conducted at the peak of egg laying. Additionally, the historical literature includes many census ... counts with non-standard timing. The challenge is, therefore, to correct ‘off-peak’ census counts to make ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 149–165 : Author(s): Lynch, H.J., W.F. Fagan, R. Naveen, S.G. Trivelpiece and W.Z. Trivelpiece
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Simulation of recovery rates of fish stocks in the South Georgia and Kerguelen Islands areas
or more for all F values in from six to eight years, after which it stabilizes at the lower size ... at the end of the 20-year simulation, doubling in four years for both mortalities. For the SURVAN data set ... numbers. The yields increase by a factor of 4 for F = 0.72 and by 6 for F = 0.36 at the end of the 20 ... concern since the simulation will tend to equilibrate after a few years. The situation for c. gunnari ... Paper Title: Simulation of recovery rates of fish stocks in the South Georgia and Kerguelen ... Islands areas Abstract / Description: The benefits of conservation measures are generally based on the ... rebuilding of the depleted stocks and improvement in yields. It is desirable that such measures be based on ... the expected rate of recovery relative to rates of fishing. A simulation model based on a ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 229-298 : Author(s): Hennemuth, R.C., K.D. Bisack and G. Duhamel
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Performance and geometry of the FP-120 trawl used during UK fish stock assessment surveys around South Georgia, Subarea 48.3
calcular la abertura horizontal (y por ende, el area barrida) de una red de arrastre de fondo. Se ... g and an estimated horizontal opening h, swept area S can be estimated at the ith location by: start and end ... were mounted slightly behind the wing ends to provide basic protection when the trawl became snagged ... to be significantly different from the horizontal opening at the wing ends. These sensors can also be mounted ... Paper Title: Performance and geometry of the FP-120 trawl used during UK fish stock assessment ... surveys around South Georgia, Subarea 48.3 Abstract / Description: Methods for calculating the horizontal ... opening (and, thus, swept area) of a bottom trawl are discussed. In situ measurements of the FP-120 trawl ... used during the 1993/94 UK fish stock assessment survey around South Georgia on the MV Cordella are ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 51–69 : Author(s): Pilling, G. and G. Parkes
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Growth and natural mortality of Patagonian rockcod (Patagonotothen guntheri shagensis) from Shag Rocks shelf
/length key (Figure 2) for the second half of 1978 (Le. prior to the beginning of the fishery) were used ... of fishing gears used, 2.35 years. The age composition of P.g. shagensis before the beginning of fishing ... time of the beginning of growth (0.1149). The results presented can be used in stock and T AC ... shagensis) from Shag Rocks shelf Abstract / Description: The parameters of Bertalanffy’s growth equation ... -weight data of research and fishery survey cruises in the Shag Rocks area from 1978 to 1986. The natural ... mortality rate was assessed by six different methods and was within a range of 0.63 to 1.06. The mean value ... of natural mortality M=0.8 was used in calculations and the optimal age and length for harvesting ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 111–121 : Author(s): Shlibanov, V.I.