Search results
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Estimating the impact of depredation by killer whales and sperm whales on longline fishing for toothfish (Dissostichus eleginoides) around South Georgia
the levels of depredation caused by killer whales (Orcinus orca) and sperm whales (Physeter ... macrocephalus) around South Georgia. Since 2003, cetaceans have been observed on 22% of 14 300 observed lines ... , with killer whales present on 3.8% and sperm whales on 17.7% of lines. Killer whales appear in pod ... sizes normally of 4 to 10 animals, and often appear to actively seek out fishing vessels and ‘strip’ the ...
Meeting Document : WG-FSA-10/P06 : Author(s): J. Moir Clark and D.J. Agnew
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Data on feeding and food objects of southern minke whales
Abstract: Presented research on feeding and the dietary structure by species of minke whales ... conducted in all four seasons. There have been no noticeable increase of the population size of large whales ... over the years after the cessation of whaling. The role of a short and profitable from the energy point ... of view trophic chain «phytoplankton- krill- baleen whales», which is of main interest due to the ...
Meeting Document : SC-CAMLR-XXVI/BG/25 Rev. 1 : Author(s): Delegation of Ukraine
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An interlaboratory comparison of ages estimated for Dissostichus eleginoides from the Argentine Sea, southwest Atlantic Ocean
Abstract: To examine consistency among laboratories in age estimation of Patagonian toothfish and ... the effects on readings of different otolith processing methods, scales and otoliths were taken from ... Institute for Fisheries Research and Development (INIDEP) Argentine, National Institute of Water and ... University, Norfolk, Virginia, United States of America. (CQFE). As a consequence of the exchange of otoliths ...
Meeting Document : WG-FSA-04/45 : Author(s): M.C. Cassia (Argentina), P.L. Horn (New Zealand) and J.R. Ashford (USA)
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Modelling the dynamics of krill populations in the Antarctic Peninsula region
Abstract: The current long-term estimates of mean recruitment rates suggest that the population ... estimates of recruitment to the population can be used to model in detail interannual variation in the ... population dynamics of krill and estimate the expected mortality rates. A number of models of the population ... dynamics of krill are used to assess to what extent they can explain the observed changes in the density of ...
Meeting Document : WG-EMM-99/56 : Author(s): E.J. Murphy (United Kingdom), A. Constable (Australia) and D. Agnew (United Kingdom)
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THE POWER OF ECOSYSTEM MONITORING
ecosystem monitoring programme, the utility of which depends upon its ability (measured by the statistical ... monitoring programme of the predators of Antarctic krill Euphausia superba at South Georgia together with a ... power to detect the effects of different levels of fishing was examined. 3. The power to detect the ... effects of fishing using either the krill population or a combined predator response index was low (20–40 ...
Meeting Document : WG-EMM-08/P11 : Author(s): K. Reid, J.P. Croxall and E.J. Murphy
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Variations in the diet composition and feeding intensity of mackerel icefish (Champsocephalus gunnari) at South Georgia (Antarctic)
Abstract: The diet composition and feeding intensity of mackerel icefish (Champsocephalus gunnari ... ) around Shag Rocks and the mainland of South Georgia was analyzed from c. 8,700 stomachs collected in ... Thysanoessa species. The proportion of krill and Themisto in the diet varied considerably between the three ... seasons, whereas the proportion of mysids in the diet remained fairly constant. Krill which has a high ...
Meeting Document : WG-FSA-93/24 : Author(s): K.-H. Kock and S. Wilhelms (Germany), I. Everson (United Kingdom) and J. Gröger (Germany)
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The effects of CEMP monitoring procedures on Adelie penguin colonies
Abstract: The effects of flipper bands, implanted tags/gastric lavage and external instrument ... attachment on the performance of Adelie penguins were investigated over three seasons at Bechervaise Island ... , Mac. Robertson Land, 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 ...
Meeting Document : WG-CEMP-93/19 : Author(s): J. Clarke, K. Kerry (Australia)
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Biological characteristics of Antarctic fish stocks in the Southern Scotia Arc region
Abstract: Commercial exploitation of finfish in the southern Scotia Arc took place from 1977/78 ... to 1989/90, with its heydays from 1977/78 to 1981/82. Except for Elephant Island, the state of fish ... stocks of the southern Scotia Arc region has found little attention until 1998 despite substantial ... catches in the first four years of the fishery and the possibility to sample these catches extensively ...
Meeting Document : WG-FSA-99/16 : Author(s): K.-H. Kock (Germany), C. Jones (USA) and S. Wilhelms (Germany)
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Influence of krill availability on humpback whale breeding success
Abstract: The abundance of the Antarctic krill (Euphausia superba) has been declining in the ... western Antarctic Peninsula (WAP), probably as a consequence of the effects of the considerable increase ... survival) of the krill consumers may be compromised. In the present study, we investigated the reproductive ... success of humpback whales (Megaptera novaeangliae) from Breeding Stock G in relation to krill density ...
Meeting Document : WG-EMM-18/P15 : Author(s): E. Seyboth, F. Félix, M.-A. Lea, L. Dalla Rosa, G. Watters, K. Reid and E. Secchi
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Reports on biological information of toothfish with special reference to bycatch, depredation and spawning dynamics in Division 58.4.4 a & b by Shinsei maru No. 3 during 2008–14 seasons
weight and number, accounting for 93% and 76% of the total catch, respectively, among total of 16 species ... method and grenadier bycatch method by Gasco et al. (2014) using two size levels of unit cell, and ... SSRU 58.4.4bC. The depredation rate in weight of whales toward toothfish was estimated to be only 3.8 ... -4.8 % in SSRU 58.4.4bC during 2008-12 using the CPUE method, while the presence/absence of whales was ...
Meeting Document : WG-FSA-15/21 : Author(s): K. Taki and T. Ichii (Japan)