Search results
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International CCAMLR applied research and monitoring program, Prydz Bay priority area
Australia towards the first five years of an International CCAMLR Applied Research and Monitoring Program in ... the Prydz Bay area. Emphasis is placed on the krill based part of the marine community in the Prydz ... Bay area. Some attention is also given to the fish and squid based part of the marine community on the ... a proposed scientific research contribution by Australia towards the first five years of an ... International CCAMLR Applied Research and Monitoring Program in the Prydz Bay area •. Emphasis is placed on ... the krill based part of the marine community in the Prydz Bay area. Some attention is also given to ... the fish and squid based part of the marine community on the Kerguelen Plateau. PROGRAMME ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 283-295 : Author(s): Australia
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A simulation study of krill fishing by an individual Japanese trawler
/ Description: A model is set up for the operation (which includes both searching and fishing) of a Japanese ... parameters are determined primarily from the scientific FIBEX surveys. Output from the model of the operation ... is compared with (and partially tuned to) statistics for a sample of data from the commercial fishery ... . A major inconsistency is found: haul times are a factor of 4-5 times greater in reality than in the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 1–108 : Author(s): Butterworth, D.S.
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Estimating confidence intervals for fish stock abundance estimates from trawl surveys
estimates of abundance obtained from trawl surveys conducted by means of the swept area method, using ... likelihood ratios from Aitchison's delta distribution. Simulation tests of the method show that unbiased ... estimates of density and biomass can be obtained and that the estimated confidence intervals have close to ... the nominal coverage probability. Performance deteriorates in cases where few of the hauls contain ... by means of the swept area method, using likelihood ratios from Aitchison's delta distribution ... . Simulation tests of the method show that unbiased estimates of density and biomass can be obtained and that ... the estimated confidence intervals have close to the nominal coverage probability. Performance ... deteriorates in cases where few of the hauls contain fish and the coefficient of variation (CV) is high. The ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 203–207 : Author(s): de la Mare, W.K
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Modelling krill recruitment
observed values of the mean proportion of recruits and its variance to model recruitment in a krill ... population in terms of numbers of recruits. The method includes the calculation of natural mortality and ... other parameters consistent with the observed proportional recruitment parameters. A procedure is given ... for generating families of recruitment functions which are consistent with the statistical uncertainty ... , Australia Abstract A method is developed for using observed values of the mean proportion of recruits ... and its variance to model recruitment in a krill population in terms of numbers of recruits. The ... method includes the calculation of natural mortality and other parameters consistent with the observed ... which are consistent with the statistical uncertainty in the observed recruitment parameters. Resume ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 49–54 : Author(s): W.K. de la Mare
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Toothfish, Dissostichus eleginoides, at South Georgia
Paper Title: Toothfish, Dissostichus eleginoides, at South Georgia Abstract / Description: The ... that the exploited fish are senescent and not contributing to the breeding population (CCAMLR-VIII ... , paragraph 106). Histological examination of the gonads of a small sample of fish taken from a commercial ... longliner in January 1990 indicates that the fish are sexually mature and, at the time of sampling, are ... SOUTH GEORGIA I. Everson and S. Campbell* Abstract The Dissostichus eleginoides fishery at South ... Georgia has expanded greatly in recent years. It has been claimed that the exploited fish are senescent ... and not contributing to the breeding population (CCAMLR-VIII, paragraph 106). Histological ... examination of the gonads of a small sample of fish taken from a commerciallongliner in January 1990 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 255–261 : Author(s): Everson, I. and S. Campbell
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Age and growth of Antarctic euphausiacea (crustacea) under natural conditions
Abstract / Description: Five species of Antarctic euphausiid crustaceans were studied from the Antarctic ... Peninsula and the south-eastern Weddell Sea. Life spans range from two years for Euphausia frigida to six ... years for the krill Euphausia superba. Growth in length and weight was calculated by non-linear ... regressions. No difference in growth of krill was observed between the Antarctic Peninsula area and the ... Five species of Antarctic euphausiid crustaceans were studied from the Antarctic Peninsula and the ... south-eastern Weddell Sea. Life spans range from two years for Euphausia frigida to six years for the ... difference in growth of krill was observed between the Antarctic Peninsula area and the eastern Weddell Sea ... . Former opinions that differ are discussed. Seasonal growth was re-analyzed for the species Euphausia ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 369-370 : Author(s): Siegel, V.
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Trawl selectivity for Champsocephalus gunnari
selectivity for mackerel icefish (Champsocephalus gunnari L.), were collected in 1981 in the South Georgia ... area. The trawl bags tested were made of net webbing with 3.1 mm twine and 88.2 mm mesh size. Trawling ... speed was 3.5 knots. Icefish comprised 90 to 100% of catches. The logistic selectivity curves were ... calculated using the collected data. It was found that the selectivity factor for 88.2 mm mesh size was 2.81 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 69–75 : Author(s): Efanov, S.F., G.E. Bidenko and V.A. Boronin
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Reproductive performance of seabirds and seals at South Georgia and Signy Island, South Orkney Islands, 1976-1987: implications for Southern Ocean monitoring studies
/ Description: Aspects of the reproductive performance over the last decade of black-browed, grey-headed and ... reviewed. Breeding success of the wandering albatross, which breeds in winter and eats fish and squid, has ... remained constant, while population size has declined gradually but significantly. The other species at ... species; circumstantial evidence relating this to reduced availability of krill is discussed. The ... and P. Rotheryl (United Kingdom) Abstract Aspects of the reproductive performance over the last ... , South Orkney Islands, are summarised and reviewed. Breeding success of the Wandering Albatross, which ... gradually but significantly. The other species at South Georgia, which breed in summer and feed ... reduced availability of krill is discussed. The fluctuations in reproductive performance of the krill ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 445-447 : Author(s): Croxall, J.P., T.S. McCann, P.A. Prince and P. Rothery
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Size at sexual maturity of Patagonian toothfish (Dissostichus eleginoides)
(Dissostichus eleginoides) caught in the commercial fishery within Subarea 48.3. The results for 1996 indicate ... that L m50 occurs at 78.5 cm total length for male and 98.2 cm for female fish. In 1997 the results for ... male fish were essentially the same. For female fish there is evidence that in 1997 a significant ... bias leading to the overestimation L m50 of calculated by conventional methods. Further analysis ... the commercial fishery within Subarea 48.3. The results for 1996 indicate that Lm50 occurs at 78.5 cm ... total length for male and 98.2 cm for female fish. In 1997 the results for male fish were essentially ... the same. For female fish there is evidence that in 1997 a significant proportion, 25 to 43%, of ... sexually mature fish were not coming into spawning condition. This introduces a bias leading to the ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 37–46 : Author(s): Everson, I. and A.W. Murray
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Feeding and food intake of Electrona carlsbergi (Tåning, 1932) Myctophidae
egale a environ 15 fois le poids du corps du poisson. Pe3lOMe B JIeTHe-oceHHHti ce30H BH,lI ... by various methods was from 3.7 to 5.6% of fish body weight. The amount of food consumed by E ... . carlsbergi during the year in the waters to the south of the Antarctic Convergence is about 15 times fish ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 411–416 : Author(s): Gerasimova, O.V.