Résultats de la recherche
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A declining trend in the abundance of Notothenia rossii marmorata and Notothenia gibberifrons observed in fjords in two sites in the South Shetland Islands
to the catches of N. neglecta. A similar declining trend had been reported in the 1960s and 1970s for ... Paper Title: A declining trend in the abundance of Notothenia rossii marmorata and Notothenia ... trend observed in the abundance of Notothenia rossii marmorata and Notothenia gibberifrons in fjords in ... , King George/25 de Mayo I., over a period of eight years from 1983 to 1990 and in waters around Half ... principios de los afios 80. 1. INTRODUCTION At the Eighth Meeting of the Scientific Committee the ... WG-FSA-90/14 A DECLINING TREND IN THE ABUNDANCE OF ... of Notothenia rossii marmorata and Notothenia gibberifrons in fjords in two sites in the South ... ., over a period of eight years from 1983 to 1990 and in waters around Half-Moon 1., Moon Bay, in 1989 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 263–274 : Auteur(s): Barrera-Oro, E. and E. Marschoff
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On the power to detect changes using the standard methods for monitoring parameters of predatory species
of predatory species Abstract / Description: The CCAMLR guidelines (CCAMLR, 1989) for analyzing the ... Islands of lengths of first incubation shifts by penguins(Standard Method A2.1), duration of penguin ... trip duration (C2.0). The other Standard Methods are not evaluated because the power analysis in the ... of the power of Standard Methods A3.1, A5.1, C1.0, and C2.0 are proposed. File: 22-Boveng-and ... complication of a nested design, the standard method for monitoring foraging trip duration may be complicated ... by an inverse relationship between trip duration and number of trips. That is, if a bird with a ... ) to produce the required sample size for effective monitoring of foraging trip duration. Existing ... estimates of the variance of trip duration for an individual bird, the covariance of trip duration with ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 377–397 : Auteur(s): Boveng, P. and J.L. Bengtson
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The biology, ecology and development of fishery management advice for the anomuran crabs at South Georgia (CCAMLR Subarea 48.3)
Paper Title: The biology, ecology and development of fishery management advice for the anomuran ... available information on the biology and ecology of the lithodids at South Georgia and provides an overview ... of the development of a management regime for them. Finally it aims to highlight areas in which ... assessment and management methods in light of continuing interest in the regional crab fishery. Considerable ... ). Size limits In the 1991/92 season data from an initial 22-day trip of the US vessel FV Pro Surveyor ... majority of male P. formosa caught during the initial 22-day trip had smaller carapace widths than 90 mm ... could die for every one individual retained, depending on species compo- sition of catches, the ... Members of the anomuran crustacean family Lithodidae (commonly known as stone crabs or king crabs) are ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 1–15 : Auteur(s): Belchier, M., T. Peatman and J. Brown
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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
Paper Title: Estimating the impact of depredation by killer whales and sperm whales on longline ... data collected on longliners between 2003 and 2009 were analysed to look at the levels of depredation ... . Since 2003, cetaceans have been observed on 22% of 14 300 observed lines, with killer whales present on ... 3.8% and sperm whales on 17.7% of lines. Killer whales appear in pod sizes normally of 4 to 10 animals ... species demonstrate an east to west migration throughout the season that is not related to the pattern of ... proportion of sightings of each species in each area, assuming the split between east and west at 39°W ... at the start of the season in the east and at the end to the west, which could imply that the ... , following the Antarctic ridge and arriving at South Georgia from the east at the beginning of May ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 163–178 : Auteur(s): Moir Clark, J. and D.J. Agnew
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Patterns and processes in the distribution and dynamics of Antarctic krill
spatially variable growth rates of krill, krill loss rates due to predators, and density-dependent ... Paper Title: Patterns and processes in the distribution and dynamics of Antarctic krill Abstract ... / Description: A general framework is presented to develop, test and integrate component models of the ... distribution and dynamics of Antarctic krill population at various spatial and temporal scales. We suggest that ... variable growth rates of krill, krill loss rates due to predators, and density-dependent attraction of ... phytoplankton availability; 2. Krill loss rates are functions of predator abundance; 3. On broad scales ... DISTRIBUTION AND DYNAMICS OF ANTARCTIC KRILL S.A. Levin, A. Morin and T.M. Powell Abstract A general ... framework is presented to develop, test and integrate component models of the distribution and dynamics of ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 281–299 : Auteur(s): Levin, S.A., A. Morin and T.M. Powell
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An assessment of CCAMLR measures employed to mitigate seabird mortality in longlining operations for Dissostichus eleginoides around South Georgia
Paper Title: An assessment of CCAMLR measures employed to mitigate seabird mortality in ... the effectiveness of measures employed by CCAMLR to mitigate seabird mortality. Following an agreement ... between the Governments of the United Kingdom and Chile, a UK observer was placed aboard a Chilean ... specifications was also used, except during an experiment that attempted to assess the effectiveness of the ... aboard the BF Cisne Verde. This consisted of a retaining line, and a mother line made up of a series of ... mother line was attended by one or two winchmen working a watch of c. 3 to 4 hours. As they came to the ... sampling of toothfish was taking place, and as far as possible to cover the early, middle and late stages ... . For sampling units, the mother line was divided into lengths of 30 coils using sequences of three ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 217–230 : Auteur(s): Ashford, J.R. and J.P. Croxall
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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
East Bay the early stages of many species were found throughout the water column. In summer only four ... Paper Title: Distribution of fish larvae at South Georgia: horizontal, vertical, and temporal ... / Description: Four studies on the early life history stages of Antarctic fish at South Georgia are reported ... abundant near the coast, but rare in oceanic waters. During winter in the 265 m deep fiord of Cumberland ... near the middle of the north-east coast of South Georgia. Conclusions The early stages of the ... , but rare in oceanic waters. During winter in the 265 m deep fiord of Cumberland East Bay the early ... length is also given; this includes data from a study in the fiord of CUmberland East Bay during 20 ... and in cumberland East Bay at densities of about 2 000 per 105 m3 • The highest catches were not ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 105-141 : Auteur(s): North, A.W.
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Age and growth of the Antarctic skate (Amblyraja georgiana) in the Ross Sea
ages at maturity of 6–7 years for males and 8–11 years for females. These estimates are near the middle ... Paper Title: Age and growth of the Antarctic skate (Amblyraja georgiana) in the Ross Sea Abstract ... / Description: X-rays of vertebral half-centra, and x-rays and transmitted white light examination of caudal ... thorns, were used to estimate the ages of the Antarctic skate (Amblyraja georgiana) from the Ross Sea ... –7 years for males and 8–11 years for females. These estimates are near the middle to upper end of ... skate, but usually they fell in the middle of the size range (Figure 1); this is consistent with the ... years for females. These estimates are near the middle to upper end of the range of ages at maturity ... , Vol. 12 (2005): 183–194 183 AGE AND GROWTH OF THE ANTARCTIC SKATE (AMBLYRAJA GEORGIANA) IN THE ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 183–194 : Auteur(s): Francis, M.P. and C. Ó Maolagáin
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Fishing for toothfish using pots: results of trials undertaken around South Georgia, March–May 2000
Paper Title: Fishing for toothfish using pots: results of trials undertaken around South Georgia ... , March–May 2000 Abstract / Description: During the period March to May 2000, the UK undertook trials of ... commercial viability of this fishing method for toothfish fisheries in the CCAMLR Convention Area. While the ... method successfully caught D. eleginoides, there was a large by-catch of crab species. The catch rate of ... TOOTHFISH USING POTS: RESULTS OF TRIALS UNDERTAKEN AROUND SOUTH GEORGIA, MARCH-MAY 2000 D.J. Agnew ... Renewable Resources Assessinent Group Imperial College, Royal School of Mines Prince Consort Road ... period March to May 2000, the UK undertook trials of a pot fishing method to catch Patagonian toothfish ... the trial and the results, and discusses the commercial viability of this fishing method for ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 93–105 : Auteur(s): Agnew, D.J., T.M. Daw, G.M. Pilling and M.G. Purves
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Line weights of constant mass (and sink rates) for Spanish system Patagonian toothfish longline vessels
Paper Title: Line weights of constant mass (and sink rates) for Spanish system Patagonian ... with seabirds. The weights typically used are collections of rocks enclosed in netting bags. During ... become progressively lighter, requiring ongoing repair. This problem can be solved by use of ... relationship between the sink rates of longlines equipped with bags of rocks (4, 6 and 8 kg) and those with ... Fuego is a 53.6 m Japanese-built (1972) tuna vessel con- verted to the Spanish system of fishing. In ... modified version of the former method to avoid fish loss by toothed whales) were tested in the experiment ... compared to loss of rocks from the bags. Each 8.5 kg weight typically comprises sev- eral rocks of ... WEIGHTS OF CONSTANT MASS (AND SINK RATES) FOR SPANISH-SYSTEM PATAGONIAN TOOTHFISH LONGLINE VESSELS G ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 93–106 : Auteur(s): Robertson, G., C.A. Moreno, E. Gutiérrez, S.G. Candy, E.F. Melvin and J.P. Seco Pon