Résultats de la recherche
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Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides)
estimated to be from fish 1+ or 2+ years old, with mean total lengths of 32.5 cm and 41.3 cm respectively ... density was distinctly polymodal, to see whether ages estimated by reading otoliths were congruent with ... the length modes observed. Length densities by age were compared graphically with the overall length ... density observed. Additionally, ages were predicted for each fish based on length, and compared with ages ... majority of the otoliths (83.6%) were estimated to be from fi sh 1+ or 2+ years old, with mean total ... ned as 1+ year old. As in previous years, apart from the dates of the groundfi sh survey, no ... peaks represented 2-year-old and 3-year-old fi sh. These same peaks correspond to those estimated as ... juvenile toothfi sh. Year classes containing fi sh 1+ and 2+ years old were well represented, but older ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 1–10 : Auteur(s): Ashford, J., C. Jones, S. Bobko and I. Everson
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Seasonal and inter-annual variability in the distribution of Electrona carlsbergi in the southern Polar Front area (the area to the north of South Georgia is used as an example)
concentrations throughout the year. Results of surveys showed that the distribution and behaviour of E ... year is related to parameters of spatial and vertical distribution of fish. Interannual variability of ... morning E. carlsbergi forms shoals and later in the day develops more dense concentrations with a ... concentrations throughout the year. Results of surveys showed that the distribution and behaviour of E ... variability during the year is related to parameters of spatial and vertical distribution of fish ... of the PFZ at various times of the year (rate of warming of the surface layer, rate of ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 337–367 : Auteur(s): Kozlov, A.N., K.V. Shust and A.V. Zemsky
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Results of the CCAMLR Antarctic fish otoliths/scales/bones exchange system
agreement! 1 X 29.0 28.2 10.3 deviation = 1 year (%) 2 76.3 X 48.7 35.1 3 81 .1 89.2 X 59.9 4 66.7 88.5 ... year (%) 3.3 Notothenia gibberifrons Reader 1 2 3 Full Agreement (%) 1 2 X 100.0 100.0 ... 3. Three investigators were experienced (1, 4 and 5) and two (2 and 3) had less experienced with ... 22.9 38.0 12.0 deviation = 1 year (%) 2 60.0 X 26.2 25.6 7.0 3 54.2 47.6 X 16.7 6.0 4 71.2 50.0 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 197–226 : Auteur(s): Kock, K.-H.
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A first attempt at an assessment of the Patagonian toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands EEZ
combines these IUU catch estimates with legal catches (for calendar years) by South African operators ... EEZ Figure 3: Population model fi ts and 20-year projections in terms of the exploitable component of ... catch limit and for surveillance are discussed. HISTORY OF THE FISHERY The Fishery In early 1996 ... . This notifi cation followed the format of CCAMLR Conservation Measure 31/X. In keeping with the ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 11–32 : Auteur(s): Brandão, A., D.S. Butterworth, B.P. Watkins and D.G.M. Miller
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Research currently being undertaken by the Republic of South Africa on "dependent and related species" within the Antarctic marine ecosystem
investi':la:te their inte1·action with thei1• environrr,ent. Seals Re,,ea:rch on various ;3-spects of ... deals with selected components of the bloloBicat sciences Prosramme of the South African National ... the Hammal Re~,e,nch Institut(? of the Universit~ of' Pretoria SP@nd UF' to three mont.h~; each Year ... number <0re st i I I in Pros1·es-s. Re~;earctl Priorities have been set in accordance with those of n ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 59-77 : Auteur(s): South Africa
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Do krill and salps compete? Contrary evidence from the krill fisheries
during early spring by salp blooms could deprive krill of sufficient food and retard krill gonadal ... were stern trawlers which fished with midwater trawls. Ten-kilogram subsamples were taken from each ... analysis of deviance was carried out using a generalised linear model (GLM) with an identity link ... function and binomial errors (Venables and Ripley, 1994), with the proportion of green krill as the ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 205–216 : Auteur(s): Kawaguchi, S., T. Ichii, M. Naganobu and W.K. de la Mare
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Effects of different harvesting strategies on the mackerel icefish Champsocephalus gunnari around South Georgia
50% F 0.1 with F increasing three or five years after a good recruitment; pulse fishing at an ... interval of three years with no fishing in between; and changes in net selectivity resulting in a shift in ... constant levels of fishing mortality to the strength of the incoming year class. An increase of F, however ... the mackerel icefish (Champsocephalus gunnari) have been simulated for a period of 30 years. These ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 77–100 : Auteur(s): Köster, F.W. and K.-H. Kock
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Preliminary study on nesting Adélie penguins disturbance by unmanned aerial vehicles
with penguins looking up and around for a few seconds when the UAV was overhead. Similar symptoms of ... there is only limited information on the subject with almost no dedicated research to address it ... . During the overflight by a UAV powered by piston engine, symptoms of vigilance were observed with ... incubation period in November 2014, the colony was overflown by two UAVs with different propulsion systems ... , size) of penguins sitting on nests were conducted, with aerial photo images taken using an SLR Canon ...
Science Journal Paper : CCAMLR Science, Volume 23 (CCAMLR Science, Volume 23) : 1–16 : Auteur(s): Korczak-Abshire, M., A. Kidawa, A. Zmarz, R. Storvold, S.R. Karlsen, M. Rodzewicz, K. Chwedorzewska and A. Znój
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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 ... recruiting an abundant year-class to the exploited stock. The biomass of other bottom species is more stable ... the biomass density of C. ~ari stock. High biomass aensity appeared with ~year intervals after ... . In a period of predominance of age-group II fish in the catches, they appeared with 2-4 year ... by high biomass densities was quite different. In both of them, 3-year old fish predominated ... years, this year class might keep catches in the 1986/87 and the following season at a high level. To ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 185-211 : Auteur(s): Mucha, M. and W. Ślósarczyk
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An assessment of the mackerel icefish (Champsocephalus gunnari) off Heard Island
though virtually no pre-spawning 2-year-old fish were taken with this gear in 1997, the proportion of ... recent trawl survey gives a biomass estimate of about 50 000 tonnes, with two strong year classes in ... these figures with the growth curve shows that the age at first spawning is three years. WEIGHT ... years from the two abundant cohorts of 1 500 tonnes, comprising 900 tonnes in the first year and 600 ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 79–101 : Auteur(s): de la Mare, W.K., R. Williams and A.J. Constable