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An overview of Southern Ocean zooplankton data: abundance, biomass, feeding and functional relationships (submitted to the 2008 Joint CCAMLR-IWC Workshop)
fixed (Q10-type) temperature relationships based on global literature compilations must be applied with ... an enormous amount of data on Southern Ocean (SO) zooplankton, mostly on their distribution with a ... assist SO food-web modellers or those with limited specialist knowledge of SO zooplankton. First, a brief ... overview is provided of the diversity and basic biology of SO zooplankton, with an emphasis on abundance ... ) temperature relationships based on global literature compilations must be applied with great caution in SO ... ; Pasternak and Schnack-Schiel, 2001). A global analysis of copepod diets showed that ciliates comprise on ... blooms, these indeed appear to be ingestable by the copepods, although food size increases with copepod ... be a less active, efficient species, with corresponding energy budget terms perhaps one-third to ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 171–218 : Автор(ы): A. Atkinson, P. Ward, B.P.V. Hunt, E.A. Pakhomov and G.W. Hosie
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Towards the development of a management plan for mackerel icefish (Champsocephalus gunnari) in Subarea 48.3
mortality rates. These may be associated with increased consumption of C. gunnari by Antarctic fur seals in ... probability that C. gunnari populations will be depleted even in the absence of fishing, which, given the ... modifications to the decision rules are discussed. It is concluded that while the GYM can be used to estimate a ... large factor (assumed here to be 4), declining to normal levels again when krill return. This paper ... rates. These may be associated with increased consumption of C. gunnari by Antarctic fur seals in years ... significant probability that C. gunnari populations will be depleted even in the absence of fishing, which ... modifications to the decision rules are discussed. It is concluded that while the GYM can be used to estimate a ... suggested that marked declines in stock biomass in some years were unlikely to be the result of commercial ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 63–77 : Автор(ы): Agnew, D.J., I. Everson, G.P. Kirkwood and G.B. Parkes
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Analysis of changes in biomass of fish stocks in the South Georgia area in 1976/77-1986/87
biomass density of C. gunnari stock. High biomass density appeared with 2-4 year intervals after ... depth zone, separately in each statistical subdivision. This means that in comparison with our ... et al. 1985, Annex 1) showed that such an estimate may be 2.5-3 times higher than a biomass ... is stable and it seems unlikely that catches should be limited. What is worth doing is improving ... the biomass density of C. ~ari stock. High biomass aensity appeared with ~year intervals after ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 185-211 : Автор(ы): Mucha, M. and W. Ślósarczyk
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Age–length composition of mackerel icefish (Champsocephalus gunnari, Perciformes, Notothenioidei, Channichthyidae) from different parts of the South Georgia shelf
western parts of the area. It is implied that part of tlne western group migrates towards Shag Rocks at ... the age of 2-3 years. It has been found that, by number, recruits represent the largest part of the ... population, whether a fishery is operating or not. As a result of this, as well as the species039; ability ... in both areas. It should be noted that on the South Georgia shelf the presence of one or two ... predomii-tance of fish 15-25 cm long ii-t the east and northeast of the shelf could be attributed to more ... also be noted that some C. gunnnvi year classes were completely absent in our samples or were at such ... CCAMLR Scieilce, Vol. 8 (2001): 133-146 AGE-LENGTH ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 133–146 : Автор(ы): Frolkina, G.A
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Towards an initial operational management procedure for the krill fishery in Subareas 48.1, 48.2 and 48.3
year period, with a reference CPUE level (CPUE ref) calculated as the average CPUE over that time ... suggestions for such procedures should be made in a similar fashion to that set out in the paper. Suggestions ... , and an algorithm for specifying the levels of regulatory mechanisms (e.g., a catch control law) that ... . Thereafter TACs may increase by C r % per annum. However, this increase may be suspended or reversed in any ... level (CPUEref) calculated as the average CPUE over that time. Thereafter T ACs may increase by cr ... associated probability that T AC reductions may prove necessary during the 20-year period considered ... procedures should be made in a similar fashion to that set out in the paper. Suggestions by others for ... Krill held earlier this year agreed that this level of catch was unlikely to be having much impact on ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 189–219 : Автор(ы): Butterworth, D.S.
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Diet study of Antarctic toothfish caught in the east Antarctic based on stomach content, fatty acid and stable isotope analyses
isotope ratios were determined and compared with those of species caught as by-catch and collected from ... toothfish stomachs. Stomach content analyses showed that Antarctic toothfish fed primarily on fish and to a ... , 1987; Michener and Schell, 1994). δ13C in an animal usually occurs within 1‰ compared with that of ... using a Pasteur pipette. The hexane phases were mixed with sodium sulfate (Na2SO4: hexane phase = 1.5 ... Sea. These differences may be associated with the optimisation of energy acquisition. In the ... with previous studies, suggesting that icefish, rib- bon barracudina (A. risso), Whitson’s grenadier ...
Science Journal Paper : CCAMLR Science, Volume 22 (CCAMLR Science, Volume 22) : 29–44 : Автор(ы): Park, H.J. , I. Yeon, E. Han, Y.J. Lee, S.M. Hanchet, G.W. Baeck, Y. Kwon, S.G. Choi, D.W. Lee and C.K. Kang*
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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 season in August. Killer whale interactions appear to be more consistent with no obvious pattern ... . Since 2003, cetaceans have been observed on 22% of 14 300 observed lines, with killer whales present on ... whales occur during May at the start of the season with the sightings becoming fewer towards the end of ... between months. Both species demonstrate an east to west migration throughout the season that is not ... then be calculated as T divided by the sum of the individual Cs. Noting that some high CPUE areas ... whales, supports the hypothesis that sperm whales may be Moir Clark and Agnew 168 T ab le 2 ... the start of the season with the sightings becoming fewer towards the end of the season in August ... . Killer whale interactions appear to be more consistent with no obvious pattern between months. Both ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 163–178 : Автор(ы): Moir Clark, J. and D.J. Agnew
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Significant intra-annual variability in krill distribution and abundance at South Georgia revealed by multiple acoustic surveys during 2000/01
surveys in one season would provide information on short-term variability that could be used to set data ... rose significantly (P = 0.020) by midseason (to 34.7 g m-2). In a pattern that is consistent with ... March 2001 (late-season). The surveys were the first in a newly planned five-year series of observations ... Survey since 1996 (and on a more ad hoc basis since the early 1980s). We hoped that conducting several ... variability that could be used to set data from more restricted once-per-season ‘snap-shot’ cruises in a ... - season (to 34.7 g m-2). In a pattern that is consistent with observations from previous years, krill ... research cruise in December 2000–January 2001, and third during March 2001 in association with the fi nal ... variance (see Brierley et al., 1999), and that acceptable survey precision could be ob- tained from only ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 71–82 : Автор(ы): Brierley, A.S., C. Goss, S.A. Grant, J.L. Watkins, K. Reid, M. Belchier, I. Everson, M.J. Jessop, V. Afanasyev and J. Robst
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Preliminary analyses of data collected during experimental phases of the 1994/95 and 1995/96 Antarctic crab fishing seasons
100 to 300 fathoms. The Phase 1 results suggest that it would not be appropriate to extrapolate local ... suggested that depletion estimators will not be appropriate tools for estimating local abundances of P ... models and depletion estimators. Results from the generalised additive models show that the density of ... . spinosissima. It was not possible to determine whether depletion estimators can be used to estimate crab ... 100 to 300 fathoms. The Phase 1 results suggest that it would not be appropriate to extrapolate local ... movement and suggested that depletion estimators will not be appropriate tools for estimating local ... associated with these estimates. In general, t l ~ e experimental harvest regime was successful. The regime ... over a wide area. Phase 1 should be undertaken a t the beginning of the first season in which a ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 141–159 : Автор(ы): Watters, G
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Fishing ground selection in the Antarctic krill fishery: trends in patterns across years, seasons and nations
remained relatively constant in Subareas 48.2 (March–May) and 48.3 (June–August). In 25 years of krill ... within Area 48 based on fine-scale data. It should be noted that, as mentioned above, the proportion of ... 2001/02, some catch was reported from APBSE and APBSW during the June–August period (mid-winter ... remained June–August. It is also worthwhile to note that recent catches during the September–November ... , the fishing patterns could be subdivided into three main groups, with two stand-alone nations ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 117–141 : Автор(ы): Kawaguchi, S., S. Nicol, K. Taki and M. Naganobu
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