Search results
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Factors that may influence the accuracy of abundance estimates from CCAMLR tag-recapture programs for Dissostichus spp. and best practice for addressing bias
cases, examples of at-sea or model-based approaches are available from established Dissostichus spp. tag ... Paper Title: Factors that may influence the accuracy of abundance estimates from CCAMLR tag ... Lincoln-Petersen equation, the simplest form of an abundance estimator using tag-recapture data, was used ... -recapture programs to reduce these biases. Estimates of post-capture mortality, tag-detection rates and ... spp. are also summarised. In nearly all cases, examples of at-sea or model-based approaches are ... : (i) initial capture, tagging and release of fish (ii) the period while tagged fish are at liberty ... of the centralised database at the CCAMLR Secretariat (CCAMLR Secretariat, 2011; Dunn and Middleton ... program while tagged fish are at liberty and their impact on parameters of the Lincoln-Petersen equation ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 63–72 : Author(s): Welsford, D.C. and P.E. Ziegler
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Southern elephant seals and CCAMLR
, many of which make short feeding trips throughout the summer. At lIes Kerguelen and Heard Island ... of this species have declined at Kerguelen, Marion, Prince Edward and Heard Islands. Population ... research findings of primarily South African (including some French and Australian results) studies on the ... southern elephant seal (Mirounga leonina) in the Kerguelen province of the Southern Ocean. Sub-populations ... been recently confirmed for the Macquarie Island stock. The availability of food, competition with ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 465-473 : Author(s): Bester, M.N. and D.G.M. Miller
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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 ... (Subarea 48.2) from three bottom trawl surveys Abstract / Description: Stocks of finfish exploited around ... /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 ... . However, overall levels of biomass indicate very little potential for commercial exploitation at this ... at two stations north of Coronation Island (Figure 4f). Large catches were also taken at another ... potentially the result of low effort directed at finfish in the region after 1982/83 and the final closure ... limit is roughly at 4% of pre- exploitation levels (Kock et al., 1985) around the South Orkney Islands ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 53–74 : Author(s): Jones, C.D., K.-H. Kock and E. Balguerías
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A preliminary assessment of the stock of the ommastrephid squid Martialia hyadesi in the Scotia Sea based on data from predators
Paper Title: A preliminary assessment of the stock of the ommastrephid squid Martialia hyadesi in ... target species. It is likely, therefore, that exploitation of the sub-Antarctic ommastrephid species ... Martialia hyadesi; will be attempted in the future. This squid is an important component of the diet of ... several species of albatross and the southern elephant seal and is probably taken in significant ... , 94% of which is taken by southern elephant seals, and the other species may take at least a further ... SC-CAMLR-IX/BG/13 A PRELIMINARY ASSESSMENT OF THE STOCK ... OF THE OMMASTREPHID SQUID MARTIALIA BY ADESI IN THE SCOTIA SEA BASED ON DATA FROM PREDATORS· P.G ... exploitation of the sub-Antarctic ommastrephid species Martialia hyadesi will be attempted in the future. This ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 479–480 : Author(s): Rodhouse, P.G.
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Selectivity of standard Polish commercial trawl codends on Antarctic fishing grounds
fishery were conducted in 1950-1980. Cieglewicz and Strzyzewski (1960) studies the mechanism ... icefish and bumphead notothenia. The solution to the problem of ensuring selectivity of codends at a ... Paper Title: Selectivity of standard Polish commercial trawl codends on Antarctic fishing grounds ... Abstract / Description: Selectivity studies were carried out for two types of steelon codends used in ... commercial fishery, with a nominal mesh size A = 80 mm and A = 100 mm, made of double twines with a thickness ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 107-142 : Author(s): Zaucha, J.
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Indices of prey availability near the Seal Island CEMP site: 1990 to 1996
surveys each year were subsampled to include the foraging range of predators breeding at Seal Island ... Paper Title: Indices of prey availability near the Seal Island CEMP site: 1990 to 1996 Abstract ... / Description: Four indices of prey availability are calculated from surveys conducted in the vicinity of the ... Seal Island CEMP site during the austral summers of 1990 to 1996. The indices are measures of average ... to include the foraging range of predators breeding at Seal Island. Indices derived from these data ... composition at a spatial scale of tens of kilometres. Survey designs, including station positions and ... 100 m. This was assumed to be the foraging space of krill predators that breed at Seal Island ... and 1993) or hull-mounted at 5 m depth (1994 to 1996), were passed to a Indices of Prey ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 37–45 : Author(s): Hewitt, R.P., G. Watters and D.A. Demer
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A comparison between otoliths and scales for use in estimating the age of Dissostichus eleginoides from South Georgia
to that request. We present the results of pairwise comparisons between age estimations using otoliths ... Paper Title: A comparison between otoliths and scales for use in estimating the age of ... understanding the population dynamics and productivity of a fish stock. The use of scales to estimate age can ... result in large errors in age data for long-lived species, usually due to compression of scale circuli ... whose age has been estimated using both scales and otoliths. We estimated the age of D. eleginoides ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 75–92 : Author(s): Ashford, J.R., S. Wischniowski, C. Jones, S. Bobko and I. Everson
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Characteristics of seasonal variation in diurnal vertical migration and aggregation of Antarctic krill (Euphausia superba) in the Scotia Sea, using Japanese fishery data
Paper Title: Characteristics of seasonal variation in diurnal vertical migration and aggregation ... of Antarctic krill (Euphausia superba) in the Scotia Sea, using Japanese fishery data Abstract ... / Description: Seasonal variation in the diurnal vertical migration and aggregation of Antarctic krill ... ) was highest during the day and lowest at night in autumn and winter in each area, but lower during the ... at night (Figure 2). The pattern of diurnal change in average trawling depth in SG was different ... from that of the other two areas, being deepest during morning twilight and shallowest at dusk from ... (2005): 163–172 163 CHARACTERISTICS OF SEASONAL VARIATION IN DIURNAL VERTICAL MIGRATION AND ... AGGREGATION OF ANTARCTIC KRILL (EUPHAUSIA SUPERBA) IN THE SCOTIA SEA, USING JAPANESE FISHERY DATA K. Taki ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 163–172 : Author(s): Taki, K., T. Hayashi and M. Naganobu
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Statistical problems in krill stock hydroacoustic assessments
: Two primary issues are at question for hydroacoustic assessments of krill. The first is the methods ... applied to establish biomass in a survey area and the second is the improvement in accuracy of target ... -strength measurements. In the case of statistical methods, there are no clear guidelines for deciding what ... does not invalidate the use of available methods to conduct surveys and analyze results. In the case of ... sampling strategies. However, awareness of the problem can at least prompt consideration of prevailing ... HYDROACOUSTIC ASSESSMENTS M.C. Macaulay Abstract Two primary issues are at question for hydroacoustic ... assessments of krill. The first is the methods applied to establish biomass in a survey area and the second ... is the improvement in accuracy of target-strength measurements. In the case of statistical methods ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 301–309 : Author(s): Macaulay, M.C.
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Analysis of trends in Japanese krill fishery CPUE data, and its possible use as a krill abundance index
Paper Title: Analysis of trends in Japanese krill fishery CPUE data, and its possible use as a ... Japanese krill fishery for the 1980/81 to 2003/04 fishing seasons were analysed. For a number of ... definitions of effort and catch-per-unit-effort (CPUE), variables were modelled using linear mixed models in ... order to obtain time series of predicted intra- and interannual trends of standardised fishery indices ... stable trend, with a slight increasing trend at the beginning of the fi shing season, but there is ... rm that CPD and/or CPT as an index of density saturates at higher density levels. However, the ... the early days of the fi shery; a variation range of only 1.6 at most. TTPD varied up to 13-fold ... of 150, and declined beyond this point. Zero values (CPT, CPD and CPTT) were observed at 160 CPST ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 1–28 : Author(s): Kawaguchi, S., S. Candy, S. Nicol, K. Taki and M. Naganobu