Résultats de la recherche
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An assessment of the exploratory fishery for Dissostichus spp. on BANZARE Bank (CCAMLR Division 58.4.3b) based on fine-scale catch and effort data
Paper Title: An assessment of the exploratory fishery for Dissostichus spp. on BANZARE Bank ... fine-scale catch and effort data held by CCAMLR for BANZARE Bank, as well as descriptive analyses of ... depletion analysis of stratified catch and effort data indicate that there is strong evidence for depletion ... species in catches in one ground for the first time. Incomplete reporting of biological information for by ... activity. Maximum line lengths for the 2004/05 to 2006/07 seasons were between 30 and 40 km, giving an ... – Division 58.4.3a) and an estab- lished fishery for D. eleginoides around Heard and McDonald Islands ... . mawsoni. As an explora- tory fishery, the catch limit for the division has been nominally set at 300 ... of fish- ing grounds and low level of data coverage avail- able for an exploratory fishery of this ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 55–78 : Auteur(s): McKinlay, J.P., D.C. Welsford, A.J. Constable and G.B. Nowara
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Some principles for fisheries regulation from an ecosystem perspective
Paper Title: Some principles for fisheries regulation from an ecosystem perspective Abstract ... regulation of fisheries from an ecosystem perspective, under the Convention for the Conservation of Antarctic ... Marine Living Resources. An important task in this formulation is to derive subsidiary objectives for ... out in the Convention. An important property required for subsidiary objectives is that they are ... principles to be considered in the formulation of a framework for the. regulation of fisheries from an ... ecosystem perspective, under the Convention for the Conservation of Antarctic Marine Living Resources. An ... . An important property required for subsidiary objectives is that they are framed in terms of ... FISHERIES REGULATION FROM AN ECOSYSTEM PERSPECTIVE The main instrument for the regulation of fisheries ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 323-339 : Auteur(s): de la Mare, W.K.
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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 ... longlining operations for Dissostichus eleginoides around South Georgia Abstract / Description: Longlining ... operations for Dissostichus eleginoides off South Georgia were assessed for interactions with seabirds and ... the effectiveness of measures employed by CCAMLR to mitigate seabird mortality. Following an agreement ... lasting 20 minutes each over an observation period of 1.5 to 2 hours. Observations were made from the ... . For sampling units, the mother line was divided into lengths of 30 coils using sequences of three ... marked connecting lines. At the start of hauling, four 30-coil lengths were randomly selected for ... April, an experiment was conducted for one month to assess the effectiveness of the streamer line in ...
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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Target strengths of krill at 136 and 20 kHz
Paper Title: Target strengths of krill at 136 and 20 kHz Abstract / Description: Estimation of ... . Ensonification of encaged live krill. For aggregations with mean lengths from 45 to 50 mm the mean single-krill ... target strengths range from-68 to-69 dB at 136 kHz. For aggregations with mean lengths from 43 to 47 mm ... the mean single-krill target strengths range from-71 to-77 dB at 20 kHz. Trawl hydroacoustic method ... strengths range from -71 to -77 dB at 20 kRz. Trawl hydroacoustic method. For aggregations with mean ... Group on Krill called for a review of all current works on determination of krill target strength (TS ... krill with an average length of 45 to 50 mm, while at a frequency of 20 kHz target strength values of ... -71 to -77 dB were obtained for krill with an average length of 43 to 47 mm. Trawl Hydroacoustic ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 141–157 : Auteur(s): Kasatkina, S.M.
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Age determination of Notothenia gibberifrons from the South Shetland Islands, Antarctic Peninsula subarea (Subarea 48.1)
most reliable method. Mean length data at age presented here for Low I. specimens were compared with ... Paper Title: Age determination of Notothenia gibberifrons from the South Shetland Islands ... scale readings gave a result of one year more. This could arise from the difficulty in differentiating ... between false and annual checks in scales. Age determination by otolith cross sections proved to be the ... ), however, no data were obtained for the first 1-4 year age groups. Therefore, growth curves were not ... presented here for Low I. specimens were compared with previous published values. This confirmed that fish ... species. Up to now several papers have been published on the age and growth of N. gibberifrons. Kock et ... , gave age-length information for a population sampled in South Bay (Palmer Archipelago, Antarctic ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 143-160 : Auteur(s): Barrera-Oro, E.
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Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides)
observed in the length density represent different age cohorts separated by one year. File: 01ashford.pdf ... Paper Title: Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides) Abstract ... 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 ... 50 60 70 80 90 Fr eq ue nc y 40 30 20 10 0 ... 80 60 40 20 0 Estimated age (years) 0 2 4 6 ... qij is the proportion of fi sh of age i within an age subsample for a length j. RESULTS Of the ... the region will be needed to clarify this matter. A product of this study is an age–length key for ...
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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Length- and age-at-spawning of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea
maturation stage by approximately May each year. The age at 50% spawning for females on the Ross Sea slope ... spawn at a younger age with an A 50% of 12.8 years (95% CI 11.9–14.0) or 120.4 cm (95% CI 114.8–126.7 ... stage for at least one year. Individual oocytes are then recruited into the vitellogenic phase over at ... Paper Title: Length- and age-at-spawning of Antarctic toothfish (Dissostichus mawsoni) in the ... L50% for the hindcast ogive. 0 10 20 30 40 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 Age (y) P ro po rti ... Age (years) 0 10 20 30 ... f fi sh Age (years) 5 10 15 20 25 30 ... Parker and Grimes 56 summer fishery. The age-at-spawning for the fore- casting method is then one year ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 53–73 : Auteur(s): Parker, S.J. and P.J. Grimes
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Age–length composition of mackerel icefish (Champsocephalus gunnari, Perciformes, Notothenioidei, Channichthyidae) from different parts of the South Georgia shelf
the South Georgia area. An analysis of the spatial distribution of C. gunnari size and age groups over ... similar age-length composition for young fish inhabiting areas to the west of the island and near Shag ... to live not only in off-bottom, but also in pelagic waters, an earlier age of sexual maturity ... the age of 2-3 years. It has been found that, by number, recruits represent the largest part of the ... addition, for those years for which data on age-length composition were available, the size composition ... dominant age groups was characteristic for C, gulznnri, not only during years of systematic intensive ... sometimes observed to be completely absent for several years (e.g. 1982 year class) (Figure 4). A ... . An analysis of the spatial distribution of C. giirzrznri size and age groups over the eastern ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 133–146 : Auteur(s): Frolkina, G.A
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A preliminary assessment of age and growth of Antarctic silverfish (Pleuragramma antarcticum) in the Ross Sea, Antarctica
-growing with a moderate longevity; the maximum estimated age was 14.3 years. Von Bertalanffy parameters ... derived for both sexes combined are: L ∞ 22.1 cm SL; K 0.167 y –1; t 0 –0.4 years. Parameter estimates ... Paper Title: A preliminary assessment of age and growth of Antarctic silverfish (Pleuragramma ... were also derived for the sexes separately. Female Antarctic silverfish appear to reach a larger size ... 25 0 3 6 9 12 15 Age (years) St an da rd le ng th (c m ) 0 5 10 15 20 25 0 3 6 9 12 ... 5 6 7 8 9 10 11 12 13 14 Age (years) Fr eq ue nc y Age (years) Fr eq ue nc y 50 40 30 20 ... = 0.96) and 4.1% for weight (n = 20, r2 = 0.98). Age and growth Otolith preparation Otoliths were ... agefrequency histogram for 304 Antarctic silverfish sampled from the Ross Sea. 0 10 20 30 40 50 1 2 3 4 ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 75–86 : Auteur(s): Sutton, C.P. and P.L. Horn
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Age, growth and mortality of Patagonian toothfish (Dissostichus eleginoides) caught off Kerguelen
otoliths from reference collections were used to measure precision; relative bias for the age data was ... depth or season. Age–length keys were constructed for use in assessing toothfish catches made by ... estimated to be –0.6 years and residual variance 2.9. Age distributions of toothfish caught by two vessels ... Paper Title: Age, growth and mortality of Patagonian toothfish (Dissostichus eleginoides) caught ... Estimated age (years) 0 10 20 30 40 50 T ot al le ng th ( cm ) 0 20 40 60 80 100 120 140 (a ... estimated for reader R2. 0 10 20 30 40 50 T ot al le ng th ( cm ) 0 20 40 60 80 100 120 140 ... ge ( ye ar s) 0 10 20 30 40 50 Reference age (years) 0 10 20 30 40 50 E st im at ed a ... of age i within an age subsample for a total length j. To estimate the rate of instantaneous total ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 29–41 : Auteur(s): Ashford, J., G. Duhamel, C. Jones and S. Bobko