Search results
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Comparison of NASC values calculated by swarm-based and grid-based acoustic data processing methods for Antarctic krill density estimation
Abstract: The one nautical mile integrated Nautical Area Scattering Coefficient (NASC) values of ... four surveys in 48.1 fishing area were calculated using both the swarm-based and conventional grid ... -based acoustic data processing methods. All parameter settings were consistent with the reports of SG ... -ASAM-2017 except that the dB difference window of Sv 120 kHz-Sv 38kHz is set 0 to 20 dB. And the two ...
Meeting Document : SG-ASAM-18/04 Rev. 1 : Author(s): X. Yu, X. Wang and X. Zhao
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A study of UK and Russian surveys using acoustics to augment trawling methods in shelf waters off South Georgia (Subarea 48.3)
. Both used acoustic and trawl methods, and this paper uses both datasets to explore the similarities and ... differences between the surveys and discuss how much of the variation between the vessels was due to ... differences in the gear used and how much was due to natural spatial/temporal variability of the stock. The ... acoustic surveys indicated that icefish were not only located near to the seabed, but that a significant ...
Meeting Document : WG-FSA-02/56 : Author(s): S. Kasatkina, P. Gasyukov (Russia), C. Goss, I. Everson, M. Belchier, T. Marlow, A. North and M. Collins (United Kingdom)
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Proposal for an experimental crab fishery in Subarea 48.3
Abstract: An experimental management strategy is proposed for the Paralomis spinosissima fishery ... around South Georgia. The strategy is designed to answer specific, a priori questions about the ... years/fishing seasons. Phase 1 occurs at the start of the first fishing season and is a "survey ... fishing operations continue until the TAC for the first fishing season is attained. Phase 2 starts at the ...
Meeting Document : WG-FSA-93/22 : Author(s): George Watters (USA)
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Krill aggregation characteristics: spatial distribution patterns from hydroacoustic observations. Polar Biology (in press)
Abstract: The distributional features and physical characteristics of some 1500 krill (Euphausia ... superba Dana) aggregations detected and sized acoustically in the south-west Indian Ocean are described ... . The aggregations were on average considerably smaller than elsewhere in the Antarctic. Aggregation ... biomass was log-normally distributed with a mean of 0.18 t. Only 3% of the aggregations were heavier than ...
Meeting Document : WS-KCPUE-89/11 : Author(s): D.G.M. Miller and I. Hampton (South Africa)
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Stock structure of Antarctic toothfish in Statistical Area 88 and implications for assessment and management
Abstract: We review the stock structure of Antarctic toothfish in Statistical Area 88 with the ... aim of characterising the likely stock boundaries relative to stock assessments. We include ... , growth dynamics, and egg and larval dispersal simulations. Taken together, the information suggests two ... Sea Region stock. The Amundsen Sea stock likely includes juveniles and adults along the continental ...
Meeting Document : WG-SAM-14/26 : Author(s): S.J. Parker, S.M. Hanchet and P.L. Horn (New Zealand)
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Variability of krill fishery operations in Subarea 48.2 in relation to fishing methods: spatial–temporal distribution of CPUE and of fishing efforts
Abstract: The author continue to analyze krill fishery data for understanding fishery operations ... in Subarea 48.2 with special attention to the period 2006-2011 which is characterized by the highest ... values of standardized CPUE indices in the Subarea 48.2 for the last 25 years. The paper provides the ... to differences between national fleets. Our results provide the evidence that ‘high CPUE’ regime’ in ...
Meeting Document : WG-EMM-14/22 : Author(s): S. Kasatkina (Russia)
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Scientific observations in CCAMLR fisheries – past, present and future
Abstract: The Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) has ... the primary competency for managing fishing south of the Antarctic Polar Front. Despite a relatively ... are difficult and expensive to conduct. In addition, the size of the Convention Area, its remoteness ... and prevailing inclement weather have complicated matters. Therefore, in addition to the standard ...
Meeting Document : WG-FSA-04/64 : Author(s): Secretariat
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Results of reading tests of TOP otolith sections and time schedule of reading for Dissostichus otoliths caught in regions of data-poor fisheries
Abstract: The correct age-length keys are essential for the stock assessment of Dissostichus spp ... . by CASAL model. However, the age estimations using the otoliths have been scarcely progressed in ... regions of data-poor fisheries. Therefore the analysis is an urgent task. We have made five reading tests ... using images of thin-sectioned TOP otoliths in December 2012 and May 2013. The coefficient of variation ...
Meeting Document : WG-SAM-13/19 : Author(s): K. Taki and T. Ichii (Japan)
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Proposal for a CCAMLR Science Special Volume
Abstract: CCAMLR Science provides a valuable mechanism for promoting the science undertaken in ... connection with CCAMLR and for raising CCAMLR’s profile within the international scientific community ... . However, in recent years there has been a decrease in the number of papers submitted to CCAMLR Science for ... their publication. Taking into account the review made by the CCAMLR Secretariat, the subsequent ...
Meeting Document : SC-CAMLR-XXXVI/16 : Author(s): Delegations of Argentina and Chile
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Target strengths of krill at 136 and 20 kHz
lengths in the range (45,50) mm the mean single-krill target strengths are in the range (-68,-69) dB at ... 136 kHz. For aggregations with mean lengths in the range (43,47)mm the mean single-krill target ... strengths are in the range (-71,-77) dB at 20 kHz. Trawling-acoustic method. For aggregations with mean ... lengths in the range (47,50) mm the mean target strengths in the range (-71,-75) dB at 20 kHz were ...
Meeting Document : WG-KRILL-91/29 : Author(s): S.M. Kasatkina (USSR)