Résultats de la recherche
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The sensitivity of multiple output statistics to input parameters in a krill–predator–fishery ecosystem dynamics model
Paper Title: The sensitivity of multiple output statistics to input parameters in a krill ... within CCAMLR to evaluate options for managing the Antarctic krill fishery in the Scotia Sea and southern ... Drake Passage. The model analysed here required 2 311 input values for each of four scenarios and ... the status of predator groups more than they affected statistics indicating the status of the target ... abundance of the relevant component is <75% of the abundance in equivalent no-fishing trials at the end ... equivalent no-fishing trials at the end of the recovery period. Predators SSMU Services (II.2 the term ... of time-step t that remains in i at the end of the time-step; and ( )( ) , , , , , ,1 exp j i ... abundance at beginning of fishing period. Krill Whole model Health (II.3(b) maintenance of the ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 97–118 : Auteur(s): Hill, S.L. and J. Matthews
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A stock assessment model of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea Region incorporating multi-year mark-recapture data
Paper Title: A stock assessment model of Antarctic toothfish (Dissostichus mawsoni) in the Ross ... longline fishery for Antarctic toothfish (Dissostichus mawsoni) has been carried out in the Ross Sea region ... since the late 1990s. No fishery-independent methods of monitoring stock abundance were plausible, and ... , and tagging has been an ongoing requirement for all vessels fishing in the fishery since 2004 ... at 50% B0 at the end of the projection. A number of sensitivity analyses were carried out. These ... ). A pilot mark- recapture program was initiated by New Zealand vessels in 2001 and after the ... recruitment multipliers); y_enter is the number of years after it is spawned that a year class enters the ... south of the Antarctic Con- vergence (Gon and Heemstra, 1990). Finfish fisheries in Antarctic waters ...
Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 39–62 : Auteur(s): Mormede, S., A. Dunn and S.M. Hanchet
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Quantifying movement behaviour of vessels in the Antarctic krill fishery
Paper Title: Quantifying movement behaviour of vessels in the Antarctic krill fishery Abstract ... / Description: Ten years of recent fine-scale haul-by-haul krill data were used to characterise the behaviour ... of the krill fishery. Analysis of distance between hauls in relation to their catch level revealed a ... /haul, and the travel distance decreased as the catch level increased; this pattern was most obvious for ... within the CAMLR Convention Area (Kawaguchi and Nicol, 2007). At the end of each fishing season, each ... end of a haul, the net will be brought on board and the krill catch (Cn) will be landed in the ... Processing Rate’ of P, it gradually reduces the amount of krill remaining in the reservoir. At the end of ... amount t: duration between end of haul and end of the next haul h: duration of a haul R: Amount ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 131–148 : Auteur(s): Kawaguchi, S. and S.G. Candy
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Exploratory fishing for Dissostichus spp. in the Antarctic region (Subareas 48.1, 48.2 and 88.3)
Paper Title: Exploratory fishing for Dissostichus spp. in the Antarctic region (Subareas 48.1 ... del Fuego was conducted as part of the New Fisheries Projects developed by Chile, primarily to ... establish the presence of Dissostichus spp. in Subareas 48.1, 48.2 and 88.3. Industrial longlines (Spanish ... system) were used for the operation, with variable quantities of fish hooks (1 440 to 4 320), No. 9 ... size of bait, time of setting and hauling, depth at each end of the longline, type of bottom and ... Bransfield Strait, where one end of the longline was hung vertically, from 100 m down to 1 213 m (station ... fishing in Antarctic waters date back to the beginning of this century. During World War I, the United ... the beginning of massive exploitation of Antarctic fish (Hureau and Slosarczyk, 1990). Reports ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 1–17 : Auteur(s): Arana, P.M. and R. Vega
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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 ... 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 ... about 4 times the initial yield at the end of the 20-year simulation, doubling in four years for both ... = 0.72 and by 6 for F = 0.36 at the end of the 20 years simulated. 3. Summary of Trends 3.1 South ... more for all F values in from six to eight years, after which it stabilizes at the lower size ... equilibrate after a few years. The situation for c. gunnari is obviously different. The stock does not ...
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
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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
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 ... additional popula- tion estimation procedures such as photodocu- mentation or sample plots.) At the beginning ... 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 ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 149–165 : Auteur(s): Lynch, H.J., W.F. Fagan, R. Naveen, S.G. Trivelpiece and W.Z. Trivelpiece
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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
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 ... second most skewed (after L. squamifuons), based on the variability of catch on a haul-by-haul basis ... . However, one should bear in mind that the 1985 survey was conducted only a few years after a substantial ... after the closure of the area for finfishing and about 10 years after the peak of commercial fishing ... potentially the result of low effort directed at finfish in the region after 1982/83 and the final closure ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 53–74 : Auteur(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
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 ... the end of the projection period to the median un- fished spawning stock biomass, SSB0) of 1.0 over a ... %, 25%, 30% and 35% of SSB0 at the end of the 5-year period. The annual catches taken in each scenario ... , starting in the year immediately after historical overfishing had ceased. Table 2: Input parameters for ... that results in a greater than 50% chance after 20 years that the stock has recovered to 95% of the ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 47–55 : Auteur(s): Welsford, D.C
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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
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 ... , swept area S can be estimated at the ith location by: start and end of each tow using a Furuno GPS ... measurements of the horizontal opening resulted. The mountings of the sensors were checked at the end of each ... tow was recorded by the ship's echo sounder (Furuno model 780/782). Timing of the Start and End of ... which slows down the ship. The end of the tow, i.e. when the trawl came off the bottom and stopped ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 51–69 : Auteur(s): Pilling, G. and G. Parkes
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The effects of monitoring procedures on Adélie penguins
Paper Title: The effects of monitoring procedures on Adélie penguins Abstract / Description: The ... effects of flipper bands, implanted tags, gastric lavage and external instrument attachment on the ... , Antarctica. The return rates of birds carrying bands and/or implanted electronic transponders were compared ... to investigate the contribution of bands to bird mortality and to determine rates of band and tag ... tags by the end of the 1992/93 season) of one tag failing after nine months. Thirty-four chicks ... end of which had penetrated the elbow joint. Closed stainless steel bands transferred at regular ... greater significance towards the end of the breeding season when meals are larger and less frequent and ... loss in King penguins has been estimated at 22% during the first year after banding (Weimerskirch ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 155–164 : Auteur(s): Clarke, J. and K. Kerry