Résultats de la recherche
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ESTIMATION OF MANAGEMENT REFERENCE POINTS CONSISTENT WITH THE CATCH TRIGGER LEVEL FOR THE ANTARCTIC KRILL FISHERY IN AREA 48
biomass reference points for the krill fishery in CCAMLR Area 48 consistent with the catch trigger level ... of F and SSB reference points for the krill stock in Area 48 consistent with the catch trigger level ... are 0.0159 (95 % CIs: 0.00750 – 0.0357) and 97.7 % SSB0 (80 % CIs: 71.6 – 135 %) respectively. In ... increases substantially with increased recruitment variability, though in absolute terms remains negligible ...
Meeting Document : WG-EMM-11/17 : Auteur(s): T. Peatman, J. Moir Clark, D.J. Agnew (UK)
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Managing ecosystem uncertainty: critical habitat and dietary overlap of top-predators in the Ross Sea
Abstract: We summarize three types of data in order to increase appreciation among fishery ... managers of the close spatial and temporal ecological overlaps among top predators in the Ross Sea Shelf ... whale, though other species might also soon be exploited in the Ross Sea region. In addition to those ... two predators we also include other trophic competitors and (and in two cases predatory species ...
Meeting Document : WG-EMM-06/29 : Auteur(s): Testa, J.W., Stewart, B.S., Olmastroni, S., Lyver, P., Karl, B., Eastman, J., Barton, K., Ballard, G., Toniolo, V., Wilson, P., Ainley, D.
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Detection of systematic change in Adélie penguin foraging trip duration: consequences of high inter-annual variability and usefulness of ice cover as a covariate
temporal change in CEMP Parameter A5 (penguin foraging trip duration). Two different types of systematic ... change were investigated: 1) change occurring at a constant rate after a certain point in time and 2) a ... sudden step change in parameter values from one average level to another. Modelling showed that change of ... three foraging trips each were required to detect a 35% step increase in foraging trip duration after ...
Meeting Document : WG-EMM-05/22 : Auteur(s): J. Clarke, C. Southwell and L.M. Emmerson (Australia)
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Krill distribution and biomass variability within Subarea 48.3 in June 1991
in an 8 x 6 mile micropolygon, where eight consecutive hydroacoustic surveys were carried out. Krill ... were of 30 m in length, with density up to 200 g/m3. About 75% of all swarms revealed biomass to be ... less than 1 tonne. Average statistical parameters of swarms in the polygon varied insignificantly from ... 1 554 units. Krill biomass in the polygon varied spasmodically within the range from 1 091 to 6 085 ...
Meeting Document : WG-KRILL-93/35 : Auteur(s): S.M. Kasatkina, E.N. Tymokhin, P.P. Fedulov and K.E. Shulgovskiy (Russia)
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GIS ‘ChartMaster’ for aquatic living resources research in Antarctic
Abstract: Geographic Information Systems (GIS) find increasing application in different fields of ... and abundance; to estimate the instant biomass in the surveyed area; to carry out the survey planning ... and designing; to carry out adaptive planning during the survey in order to localize and outline the ... for studying aquatic living resources in the Antarctic waters: The Chart of possible catches of ...
Meeting Document : WG-SAM-13/04 : Auteur(s): V.A. Bizikov, S.M. Goncharov, A.V. Polyakov, S.B. Popov and A.F. Petrov (Russia)
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Skate tagging in the Heard Island and McDonald Island (Division 58.5.2) toothfish fishery up to 2013
icefish (Champsocephalus gunnari) in the Australian Fishing Zone surrounding Heard Island and McDonald ... bycatches. A tagging program has operated in these fisheries since 2001 to learn more about the movement and ... biology of these species. In the 13 years, over 12,000 skates have been tagged, with 112 recaptures, a ... in all directions. Most recaptures occurred within the first three years, with the maximum time at ...
Meeting Document : WG-FSA-13/22 : Auteur(s): G.B. Nowara, T.D. Lamb and D.C. Welsford (Australia)
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Summary of the toothfish fishery and tagging program in the Amundsen Sea region (SSRUs 882C–H) to 2018/19
2014. Few age data are currently available after 2014. We recommend that further ageing of toothfish in ... that catch limits in the ASR be calculated following the trend analysis rules developed by WG-FSA for ... -year Chapman estimates and allowing a maximum of 20% in the catch limit for 88.2H and research block ... 882_2 are: 882H: 240 t catch and allowing a maximum of 20% change in the catch limit from 200 t ...
Meeting Document : WG-FSA-2019/12 : Auteur(s): J. Devine and S. Parker
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Modelling the predator–prey interactions of krill, baleen whales and seals in the Antarctic ecosystem
Abstract: The history of human harvests of seals, whales, fish and krill in the Antarctic is ... krill surplus in the mid 20th Century is described, and the information on population and trend levels ... ) species. The model commences in 1780 (the onset of fur seal harvests) and distinguishes the Atlantic ... /Indian and Pacific sectors in view of the much larger past harvests in former. A reference case and five ...
Meeting Document : WG-EMM-05/34 : Auteur(s): M. Mori and D.S. Butterworth (South Africa)
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PENGUIN RESPONSES TO CLIMATE CHANGE IN THE SOUTHERN OCEAN
Abstract: Penguins are adapted to live in extreme environments, but they can be highly sensitive ... , oceanography and critical habitats. For example, in the southwest Atlantic, the distributional range of the ice ... and chinstrap penguins have expanded their range southward. In the Southern Ocean, the El Niño ... changes in the marine ecosystem, ultimately affecting penguins. The interaction between these modes is ...
Meeting Document : WG-EMM-09/P09 : Auteur(s): J. Forcada and P.N. Trathan
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LENGTH AND AGE AT SPAWNING OF ANTARCTIC TOOTHFISH DISSOSTICHUS MAWSONI IN THE ROSS SEA
male Antarctic toothfish Dissostichus mawsoni from fish sampled in the Ross Sea spanning the 2000-2009 ... spawn in a given year and is therefore appropriate to evaluate spawning stock biomass relative to stock ... vitellogenic phase over at least a 6–12 month period, resulting in a developed batch of oocytes accumulating at ... ) by length. Evidence of skip spawning by females results in a right-shifted ogive, increasing the ...
Meeting Document : WG-FSA-09/37 : Auteur(s): S.J. Parker and P.J. Grimes (New Zealand)