Search results
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Using tag-recapture data to estimate catchability of a series of random stratified trawl surveys
Abstract: For the 2014 assessment of Patagonian toothfish (Dissostichus eleginoides) around the ... Heard Island and McDonald Islands (HIMI) in Division 58.5.2, a prior for catchability q of the random ... stratified trawl survey (RSTS) was estimated by comparing abundance estimates of the survey with abundance ... address potential bias in the estimation of q and conclude that the potential bias that may arise from ...
Meeting Document : WG-SAM-15/34 : Author(s): W. de la Mare, P. Ziegler and D. Welsford (Australia)
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Notes on the use of virtual population analysis for stock assessment of the mackerel icefish, Champsocephalus gunnari (Lönnberg, 1906) in Subarea 48.3 for the 1990/91 and 1991/92 seasons
Abstract: Following on from the apparent failure to satisfactorily assess the status of the C ... . gunnari population in Subarea 48.3 at WG-FSA-91 using VPA, attempts were made to re-work the analysis ... , dominated in recent years by the 1987 year class (1 year olds in 1988), was quite robust, despite the use of ... various combinations of survey and cpue indices for tuning. According to the VPA the population in 1991/92 ...
Meeting Document : WG-FSA-92/27 : Author(s): G. Parkes (United Kingdom)
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Progress report on the scientific data compilation and analyses in support of the development of a CCAMLR MPA in the Weddell Sea (Antarctica)
Abstract: At the CCAMLR meeting in 2012, the Commission welcomed the offer of Germany to take the ... Ministry of Food, Agriculture and Consumer Protection tasked the Alfred Wegener Institute, Helmholtz Centre ... . Germany intends to update the Scientific Committee on the actual state of our project, particularly on the ... main proceeds of a national data workshop held in Bremerhaven early September 2013. The main objectives ...
Meeting Document : SC-CAMLR-XXXII/BG/07 : Author(s): Delegation of Germany
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Biomass of Antarctic krill (Euphausia superba) off east Antarctica (30–80°E) in January–March 2006
the transects at 62°S. The majority of acoustic detections were in the top 100m of the water column ... Abstract: A multidisciplinary, single-ship survey of CCAMLR Division 58.4.2 was conducted in ... January-March 2006, during which time multifrequency echosounder data were collected for the purposes of ... estimating the biomass (B 0) of Antarctic krill (Euphausia superba). The mean density of E. superba ...
Meeting Document : WG-EMM-06/16 : Author(s): T. Jarvis, E. van Wijk, N. Kelly, S. Kawaguchi and S. Nicol (Australia)
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A revision of yield and catch controls for managing the mackerel icefish (Champsocephalus gunnari) fishery in the vicinity of Heard Island and McDonald Islands
Abstract: A recent 2000 survey of mackerel icefish in the vicinity of Heard Island enabled a ... revised estimate of yield for the coming 2 seasons. While the biomass of icefish appears lower than in ... previous years, it is dominated by a strong age 2 year class. Estimates of yield for the Heard Island ... fishing seasons. The results of the 2000 survey confirm the need to retain a closure to fishing on Shell ...
Meeting Document : WG-FSA-00/41 : Author(s): A. Constable, R. Williams, T. Lamb and E. van Wijk (Australia)
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A study on calibration for commercial echosounder using the bottom backscattering strength from a fishing vessel near the South Shetland Islands in Antarctic
fishing vessel to use it in estimating biomass of Antarctic krill (Euphausia superba). The method of ... calibration was to analyze the difference between the bottom backscattering strength of the commercial ... echosounder (i.e. ES70) and the scientific echosounder (i.e. EK60) at some transects designated by CCAMLR ... , was examined to verify the calibration result. The analysis result confirmed the possibility of ...
Meeting Document : WG-EMM-16/61 : Author(s): Delegation of the Republic of Korea
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Ideal survey patterns: an example of using a simulated world
Abstract: This paper considers a class of survey patterns for a toothfish long lining fishery ... criteria. The shot selection criteria can be either that locations of known good quality are preferentially ... selected or that locations are selected at random. The landscape and fishery are simulated in a spatially ... explicit Monte Carlo model and the use of such models to study these issues is considered along with their ...
Meeting Document : WG-FSA-01/75 : Author(s): I.R. Ball and A.J. Constable (Australia)
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Survey and monitoring of black petrels on Great Barrier Island 1997
extrapolating from the grid burrows shows the population consists of 4 500 breeding birds and at least 685 non ... accessible through the entrance or easily excavated to reach their contents. Eighty four of these burrows ... set up in 1996 around the summit were monitored over the 1997 breeding season. A total of 54 burrows ... -breeding birds. Author(s): Delegation of New Zealand Title: Survey and monitoring of black petrels on ...
Meeting Document : SC-CAMLR-XVII/BG/08 : Author(s): Delegation of New Zealand
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Atlas of top predators from French Southern Territories in the Southern Indian Ocean
. Indeed, seabirds and seals are considered as good indicators of changes in ecosystems at differential ... mitigation actions and restricted protection of the sole coastal areas, are insufficient, especially for the ... seabirds and marine mammals forage. The first stage of most conservation planning is to identify areas that ... identify areas of high species richness (hotspots), focusing on threat level (endangered species). This ...
Meeting Document : WG-EMM-16/42 : Author(s): K. Delord, C. Barbraud, C.-A. Bost, Y. Cherel,C. Guinet and H. Weimerskirch
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An exploration of the biological data used in the CCAMLR Subarea 48.3 Patagonian toothfish stock assessments
subarea 48.3 are analysed here, particularly whether the proportion of females in the catch, maturity at ... or maturity through time, after the effects of confounding factors were included in the analysis ... . Author(s): E. MacLeod, K. Bradley, T. Earl, M. Söffker and C. Darby Title: An exploration of the ...
Meeting Document : WG-SAM-2019/32 : Author(s): E. MacLeod, K. Bradley, T. Earl, M. Söffker and C. Darby