Search results
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Joint Polish/American hydroacoustic survey of Elephant Island and the vicinity of King George Island, 1988
of King George Island, 1988 Abstract / Description: The hydroacoustic survey found a low krill abundance ... . The full survey found (120 kHz data) 385k tonnes (in 7 787 n miles 2) in the Bransfield Strait and the area ... The hydroacoustic survey found a low krill abundance in most areas covered by last year&rsquo ... found (120 kHz data) 385k tonnes (in 7 787 n miles2) in the Bransfield Strait ... The hydroacoustic survey found a low krill abundance in most areas covered by last years survey. The total biomass ... in the Bransfield Strait. The full survey found (120 kHz data) 385k tonnes (in 7 787 n miles2) in the Bransfield ... surveyed last year. The full survey found (120 kHz data) 385k tonnes (in 7 787 n miles2 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 357–377 : Author(s): Macaulay, M.C.
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Distribution of fish larvae at South Georgia: horizontal, vertical, and temporal distribution and early life history relevant to monitoring year-class strength and recruitment
Bay the early stages of many species were found throughout the water column. In summer only four ... species of larvae were abundant, they were found in the upper 100 m of the water column, especially ... Bay the early stages of many species were found throughout the water column. In summer only four ... species of larvae were abundant, they were found in the upper 100 m of the water column, especially ... of many species were found throughout the water column. In summer only four species of larvae were ... abundant, they were found in the upper 100 m of the water column, especially the top 2 m layer at certain ... (probably not both) were found in the surface waters over the shelf and in cumberland East Bay ... 21-25 mm SL were found mostly over the shelf except for a single specimen just off the shelf ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 105-141 : Author(s): North, A.W.
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Determination of Antarctic krill acoustic back-scattering cross-section
-section of back-scattering of krill. The target strength can be determined in situ by measuring the echo ... signal from one specimen resolved by the hydroacoustic instrument. By calculating the mean level of the ... determine the acoustic cross-section of the back-scattering of krill. By experiments, the authors have ... -section of back-scattering of krill. The target strength can be determined in situ by measuring the echo ... signal from one specimen resolved by the hydroacoustic instrument. By calculating the mean level of the ... determine the acoustic cross-section of the back-scattering of krill. By experiments, the author~ have ... ACOUSTIC BACK-SCATTERING CROSS-SECTION by V.A. Protaschuk and T.A. Lukashova All-Union Research ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 141-152 : Author(s): Protaschuk, V.A. and T.A. Lukashova
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Histological study on the ovarian development of mackerel icefish (Champsocephalus gunnari) from the South Georgia Islands
. In some cases these ovaries presented few atretic oocytes; in others a generalised regression was found ... , which was observed in 41% of mature fish. A high proportion of juvenile individuals (45%) was found ... ; in others a generalised regression was found, which was observed in 41% of mature fish. A high proportion ... of juvenile individuals (45%) was found, together with a relatively low occurrence of females that spawned ... a generalised regression was found, which was observed in 41% of mature fish. A high proportion of juvenile ... individuals (45%) was found, together with a relatively low occurrence of females that spawned or were ... on the generalised oocyte resorption process found in a high proportion of individuals caught in summer 1991 ... in maturation are affected. Resorption in the pre-reproductive phase can be found in few oocytes ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 35–49 : Author(s): Macchi, G.J. and E.R. Barrera-Oro
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A review of the diet and at-sea distribution of penguins breeding within the CAMLR Convention Area (submitted to the 2008 Joint CCAMLR-IWC Workshop)
inaccurately) as stomach sampling. The contents can be accessed by dissection, administration of emetics ... et al., 2007a, 2007b; Wilson et al., 2004). Several studies have found adverse effects of devices ... %, and was found mostly in October–early November, and the paralepid N. coatsi comprised 1.7%. The cepha- lopod ... areas used by predators to levels that reduce their reproductive success or survival. Spatially–explicit ... bioenergetics models that estimate the amount of prey consumed by predators are required to inform such policy ... will be of utility to modellers as a source of parameters, and to penguin biologists by providing ... comparative information for their own findings and by highlighting significant gaps in existing knowledge and ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 75–114 : Author(s): Ratcliffe, N. and P. Trathan
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Marine mammals and demersal longline fishery interactions in Crozet and Kerguelen Exclusive Economic Zones: an assessment of depredation levels
of marine mammal species alone or in co-occurrence. In the Crozet EEZ, CPUE was found to be reduced by 22.5 ... only sperm whales, alone or in co-occurrence with fur seals, were found to impact negatively on CPUE ... /presence of marine mammal species alone or in co-occurrence. In the Crozet EEZ, CPUE was found ... . In the Kerguelen EEZ only sperm whales, alone or in co-occurrence with fur seals, were found to impact negatively ... or in co-occurrence. In the Crozet EEZ, CPUE was found to be reduced by 22.5% in the presence of killer ... whales, alone or in co-occurrence with fur seals, were found to impact negatively on CPUE. Résumé Les ... in the data for any period in any given fi shing sector. CPUE was found to vary according to fi shing ... fi sh- ing period was not found to have an effect. Compared to observations where no marine ...
Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 67–82 : Author(s): Roche, C., C. Guinet, N. Gasco and G. Duhamel
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A composite recruitment index to describe interannual changes in the population structure of Antarctic krill at South Georgia
the number of 1+ krill found around South Georgia was very low (proportion of 1+ krill <7%), while between ... 1994 and 1998 the number of 1+ krill found in the population increased with a very successful ... seven cruises between 1989 and 1998. Before 1994 the number of 1+ krill found around South Georgia ... was very low (proportion of 1+ krill <7%), while between 1994 and 1998 the number of 1+ krill found ... the number of l + krill found around South Georgia was very low (proportion of l + krill <7%), while ... between 1994 and 1998 the number of l + krill found in the population increased with a very successful ... used were based on values used by Siege1 (1987) for populations of krill found in the Antarctic ... l + krill were found in the 1995/96 and 1996/97 seasons, while large l + krill were found from 1990/91 ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 71–84 : Author(s): Watkins, J.L
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Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides)
. No difference was found between predicted and estimated ages. We conclude that the two dominant modes observed ... 1+ or 2+ years old, with mean total lengths of 32.5 cm and 41.3 cm respectively. No difference was found between ... and 41.3 cm respectively. No difference was found between predicted and estimated ages. We conclude ... subsequent quality control procedures, evidence of severe bias was found in his readings and these were ... found, and were not included in the analysis. Fish <23 cm were also not included in the analysis ... . The goodness-of-fi t test included n = 232 fi sh of TL 23–46 cm; no difference was found between predicted ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 1–10 : Author(s): Ashford, J., C. Jones, S. Bobko and I. Everson
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Investigation of bias in the mark–recapture estimate of toothfish population size at South Georgia
observed and model results was found, with, however, a different pat- tern of movement, when movement ... and tag recapture. If the distribution of effort is ideal, it again can be found that the true population ... population size. It does so by constructing a spatial model of the South Georgia toothfish fishery ... -scale boxes lying along the 1 000 m contour. The uneven distribution of fish was simulated by adjusting ... an average movement rate downwards when fish entered a high-density box (as indicated by high CPUE ... allows simulation of releases by box over multiple years. The model performed as expected with test ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 47–63 : Author(s): Agnew, D.J., G.P. Kirkwood, J. Pearce and J. Clark
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Age, growth and mortality of Patagonian toothfish (Dissostichus eleginoides) caught off Kerguelen
sexes were found, estimating von Bertalanffy parameters for males to be L ∞ = 95.9, K = 0.12, t 0 = –4.6 ... to be between 0.09 and 0.12. Significant differences in age-at-length data between sexes were found, estimating ... data between sexes were found, estimating von Bertalanffy parameters for males to be L∞ = 95.9 ... was found, as measured by the 99 percentile, to be 36 years for fi sh collected from the Northern Pride ... Bertalanffy model to the age-at-length data, small differences were found in parameter estimates between ... Kerguelen terpretation of annuli laid down before maturity. Changes in criteria, as found over the course ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 29–41 : Author(s): Ashford, J., G. Duhamel, C. Jones and S. Bobko