Résultats de la recherche

1. Scientific observations in CCAMLR fisheries – past, present and future

   / Description:  CCAMLR has the primary competency for managing fishing south of the Antarctic Polar Front ... observers on board fishing vessels has assumed prominence in the collection of essential data for fisheries ... designed to gather and validate fishery-related information essential for assessing the status of target ... the Scientifi c Observers Manual was published in a bound-book format. The manual was subsequently ... Measure 41-01 (2004), paragraph 7) (see CCAMLR, 2004b). 0 10 20 30 40 50 60 1996 1997 1998 1999 ... Longline D. eleginoides 48.3 16 7 43 1997 Longline D. eleginoides 48.3, 58.6, 58.7, 88.1 30 27 90 Trawl ... . Medium Collection of fish scales and otoliths for age determination. Medium Monitoring the location and ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 81–98 : Auteur(s): Sabourenkov, E.N. and E. Appleyard

2. Movement, growth and available abundance to the fishery of Dissostichus eleginoides Smitt, 1898 at Heard Island, derived from tagging experiments

   for the management of toothfish stocks and that trends in abundance derived from these experiments ... (approximately 80 mg Sr per kg of fi sh) to mark their otoliths for later verifi cation of the age- reading ... . In each simulation year, the biomass is recalculated by adding an amount for annual growth and ... la bl e nu m be rs (m ill io ns ) 1998 1999 2000 2001 Year 0 10 20 30 40 50 Pr ed ic ... te d nu m be rs (m illi on s) 1998 1999 2000 2001 Year 50 40 30 20 10 0 P re di ct ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 33–48 : Auteur(s): Williams, R., G.N. Tuck, A.J. Constable and T. Lamb

3. A first step towards modelling the krill–predator dynamics of the Antarctic ecosystem

   population trends without the need for recourse to environmental change hypotheses. A model is developed ... , together with suggested further areas for investigation. Amongst the key inferences of the study are that ... krill, to explain observed trends – crabeater seals seemingly play an important role and constitute a ... particular priority for improved abundance and trend information; (iii) the Atlantic/Indian Ocean sector ... , a slight increasing trend is evident for the year classes from 1990. Direct observations of the age ... – crabeater seals seemingly play an important role and constitute a particular priority for improved ... trend in the age-at-sexual-maturity for crabeater seals, which could have arisen for the same reason ... using Bayesian approaches yields an annual 7.3% (95% CI: 1.4–11.5%) increase for this species since ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 217–277 : Auteur(s): Mori, M. and D.S. Butterworth

4. Length-based assessments revisited – why stock status and fishing mortality of long-lived species such as toothfish cannot be inferred from length-frequency data alone

   other informative estimators for stock abundance and productivity, the review and the simulations ... status and fishing mortality for long-lived fish species such as Patagonian toothfish (Dissostichus ... highlight that interpretation of raw length-frequency data and single length-based indicators for stock ... selectivity functions. 0 10 20 30 40 50 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 Immature selectivity Age (y ... Age (y) 0 10 20 30 40 50 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 Mature selectivity Age (y) 2000 2010 ... selectivity Age (years) Age (years) Age (years) Year Year Year S el ec tiv ity S to ck s ta tu s ... fishery operations for an assessment of the sta- tus and productivity of the fished stocks to estimate ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 57–73 : Auteur(s): Ziegler, P.E., D.C. Welsford and A.J. Constable

5. Results of fish stock assessment survey, South Georgia region, November - December 1986

   rossii and Patagonotothen brevicauda guntheri were an order of magnitude lower than observe by Kock in ... than 1984/85, although not by an order of magnitude. Abundances of Notothenia gibberifrons and ... /85 year classes. Coefficients of variation ranged from 67.9% (Notothenia squamifrons) to 12.6% (C ... I ¥ i \ (, Y I Y I \ i i { I \ i I ( I' i I i I I I I I o 10 20 30 40 50 60 70 80 90 100 LENGTH ... ' L \ i j i I , I o 10 20 30 40 50 60 70 80 LENGTH, CM 90 100 110 120 130 Figure 13. Length ... trawl equipped with 80 mm mesh and a 20 mm liner. Distance between wing nets averaged 20.6 m, and ... , with an overall mean length of 22.3 cm. Depending on the age-length schedule used, - 148 - modes ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 143-183 : Auteur(s): Gabriel, W.L.

6. Mesopelagic fish of the Southern Ocean - summary results of recent Soviet studies

   data are available on their feeding, reproduction and age/length composition. The paper summarizes ... recently published results of these studies. A general description of mesopelagic myctophids is followed by ... and age/length composition. The paper summarizes recently published results of these studies. A ... assessment should thus be attempted for each species separately. As mentioned above, spawning and feeding of ... the ACC waters which have an adequate supply of food both for young and adult fish throughout the ... and the Antarctic Convergence areas (between 20° and 30°W) had statistically different length (SL ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 433–457 : Auteur(s): Sabourenkov, E.N.

7. Identifying taxonomic groups vulnerable to bottom longline fishing gear in the Ross Sea region

   the fishery being assessed. New Zealand identified an interim list of taxa to monitor in fishery by ... -catch in the Ross Sea as part of its benthic fisheries impact assessment. The rationale for including or ... : (L = <10 years; M = 10–30 years; H = >30 years) Growth rate: (L = mature <10 years; M = mature 10–20 ... years; H = mature >30 years or evidence for sporadic recruitment events) Fragility: (L = Flexible ... years of age for large speci- mens. Recent dating work indicates that Antarctic sponges of the common ... live longer than the 30 years estimated for more shal- low species (McFadden, 1991; Cordes et al ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 105–127 : Auteur(s): Parker, S.J. and D.A. Bowden

8. Distribution of mackerel icefish (Champsocephalus gunnari) (Channichthyidae) around South Georgia at various stages of its life cycle

   into account the spatial–temporal variability of C. gunnari. Young fish of the first age group (<15 ... is h of d om in an t l en gt h 80 m m 90 m m 46 % 29 % 90 m m 10 0 m m ... 30 .5 % 33 % 80 m m 90 m m 10 0 m m 31 % 18 % 26 % 80 m m 90 m m 21 ... (m m ) 80 81 78 76 29 / 5– 7/ 6/ 19 90 L en gt h ra ng e (m m ) 60 –1 20 60 –1 00 ... / 19 86 L en gt h ra ng e (m m ) 60 –1 30 80 –1 30 60 –1 40 70 –1 20 M od al le ng th ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 49–69 : Auteur(s): Frolkina, Zh.A

9. Sensitivity investigation of the SDWBA Antarctic krill target strength model to fatness, material contrast and orientation

   for the body shape parameterisation can give a high source of uncertainty, and there is an urgent need ... TS of Antarctic krill (Euphausia superba) for use in the acoustic echo-integration method. In this ... study, the SDWBA TS pattern and frequency response behaviours at standard survey frequencies and animal ... the distribution of animal orientations. Due to the high variability of TS to realistic changes in ... rigorously if the scattering as a function of size and frequency for an individual (i.e. target strength ... relationship for the body shape parameterisation can give a high source of uncertainty, and there is an urgent ... used to develop an inversion protocol in a multifrequency context for estimating the mean length and ... values. The last parameter describes the ori- entation of individuals within an aggregation. For a ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 97–122 : Auteur(s): Calise, L. and G. Skaret

10. A preliminary investigation of the possible effects of rhizocephalan parasitism on the management of the crab fishery around South Georgia

    captures the main characteristics of the system. An age-based host-parasite model is constructed ... reduce the effective spawning stock biomass, and this clearly has implications for stock management. The ... possible implications of parasitism for management are investigated by considering a population model that ... , incorporating two scenarios for the stock-recruit relationship of the host: (i) resilience; and (ii) sensitivity ... 60 80 100 120 Time (years) Figure 7: Prevalence and spawning stock ratios over time for a ... - recruit relationship was used. 0 20 40 60 80 100 120 Time (years) Figure 8: Prevalence and spawning ... animals only. The sensitive stock- recruit relationship was used. 0 20 40 60 80 100 120 Time (years ... considering a population model that captures the main characteristics of the system. An age-based host ...

    Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 175–192 : Auteur(s): Basson, M

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