Résultats de la recherche

1. Precautionary measures for a new fishery on Martialia hyadesi (Cephalopoda, Ommastrephidae) in the Scotia Sea: an ecological approach

   , Ommastrephidae) in the Scotia Sea: an ecological approach Abstract / Description:  In anticipation of the ... development of a new fishery for the ommastrephid squid Martialia hyadesi in the Scotia Sea, this paper ... presents a revision of annual consumption of the species by higher predators and provides a brief review of ... information about the life cycle and distribution of the species obtained from research fishing and commercial ... exploratory survey in the vicinity of South Georgia, Shag Rocks and at the Antarctic Polar Frontal Zone ... (APFZ) west of South Georgia, and caught about 8 tonnes, all at the APFZ (Rodhouse, 1991). In ... (grey-headed albatrosses feeding chicks at Bird Island, South Georgia) to the APFZ north of South ... with about 60 000 tonnes of I. argentinus. In February 1996 another BAS research cruise at South ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 125–139 : Auteur(s): Rodhouse, P.G

2. Fish stock assessment survey in Subarea 48.3

   fish survey in the vicinity of South Georgia, CCAMLR Subarea 48.3, is described. Details are given of ... positions of hauls, catch rates and size composition of catches. The standing stock of one of the most ... ) . 2. SURVEY AREA AND DESIGN The survey was aimed at providing information representative of the ... total of 66 sites was fished at South Georgia and 12 at Shag Rocks. The locations of the sites actually ... representative of a station within each depth stratum and at each location is shown in Table 2. 26 A ... species that migrate off the bottom at night. 3. DESCRIPTION OF VESSEL AND SAMPLING METHODS A stern ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 25–67 : Auteur(s): Everson, I., G. Parkes, K.-H. Kock, S. Campbell, Z. Cielniaszek and J. Szlakowski

3. [node:field-journal-volume]:37-51

   exhibited a degree of sexual dimorphism. The age at which 50% of fi sh are sexually mature was estimated ... size class at which more than 50% of the fi sh sampled were at maturity stage 2 or greater. The ... at maturity and mean age at maturity. RESULTS Species Identifi cation Of the 361 individually ... estimates of the t0 values. Natural Mortality In all the available age data, 1% of males were at least 55 ...

   Science Journal Paper : 37–51

4. An impact assessment framework for bottom fishing methods in the CAMLR Convention Area

   preliminary assessment of bottom fishing impacts for the 2008/09 toothfish longline fishery. This paper ... illustrates the utility of the standardised approach and provides a methodological template for systematic ... necessary component of a full ecological risk assessment. File:  10sharp-et-al.pdf ... ’ (probability >0.99) at the scale of the entire fishery over many seasons. Similarly, the consequence of a ... , 2005) at the scale of that particular organism, ‘moderate’ at the scale of a the local benthic ... community over years, and ‘negligible’ at the scale of the entire ecosystem over decades. Any assertions ... definitions of the spatial and temporal scales at which the event and its effects are assessed (Constable ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 195–210 : Auteur(s): Sharp, B.R., S.J. Parker and N. Smith

5. Fish distribution and biomass in the Heard Island zone (Division 58.5.2)

   / Description:  Division 58.5.2 encompasses the southern part of the Kerguelen plateau, and contains Heard ... . In order to assess the potential of this area for commercial fishing, and to obtain some preliminary ... distribution, abundance and biology of the most important species, covering a number of years and seasons. Five ... species were found to be abundant. There were two consistent areas of aggregation of Champsocephalus ... and size of the net mouth, temperature and depth at the headline and confirmation that the net was ... were chosen at random by computer, with the minimum distance between sites of 5 n miles. For each ... stratum, GR500, at 300-500 m depth was established around GR300 to allow for the presence of C. gunnari ... at this depth; * the 750 stratum was not sampled because of lack of time and the low densities of ...

   Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 1–20 : Auteur(s): Williams, R. and W.K. de la Mare

6. Refinements to the strategy for managing depleted fish stocks based on CCAMLR objectives

   objectives Abstract / Description:  A method of calculating fishing mortalities which will allow depleted ... decades is illustrated. These fishing mortalities are based on probabilistic descriptions of the future ... states of a depleted stock, and take into account uncertainty in assessments. Sample calculations show ... that applying a policy of F 0.1 will not always lead to stock recovery in two to three decades, and ... probability of 0.5 that the stock is at or above GNAI (or other target level) in 20 years; (ill) the ... of the state of the stock at a given time in the future could be done with population projections ... distribution at year 20 is the sum of the projected distributions, for the set of current stock states in the ... examined, one with the population at 30% of average pre-exploitation biomass, and the other at 5%. GNAI is ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 467–475 : Auteur(s): de la Mare, W.K. and A. Constable

7. Phytoplankton distribution in the mixed layer: implication to krill abundance

   Abstract / Description:  A one dimensional Lagrangian model of random walk is presented to study the ... distribution of phytoplankton in the Antarctic Ocean. Since little is known about mixed layer dynamics in the ... Antarctic Ocean, we estimate the depth of the mixed layer and its turbulence intensity from an Ekman layer ... . However, the effect on the dynamics is vital, affecting the distribution of particles in the upper ocean ... pycnocline near 40 m in STD237 shows a high buoyancy frequency, N, as is often found at the base of mixed ... , f the Coriolis parameter and p the density of water. Turbulence observations at mid-latitudes for ... at 61°S and the profiles are terminated at the depth of Ekman layer. The dissipation rate decreases ... Pisces submersible show the suppression of vertical velocities at scale larger than Lo. The turbulence ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 331–356 : Auteur(s): Yamazaki, H. and T.R. Osborn

8. Fishing ground selection in the Antarctic krill fishery: trends in patterns across years, seasons and nations

   years, seasons and nations Abstract / Description:  Patterns of fishing ground selection were ... remained relatively constant in Subareas 48.2 (March–May) and 48.3 (June–August). In 25 years of krill ... operations in Area 48, patterns of SSMU usage have changed. Three different patterns of seasonal SSMU ... of high krill density observed by scientific surveys, and possible reasons for this mismatch are ... STATLANT statistics, but include data at various levels of reso- lution depending on the fishing seasons ... CCAMLR database at a resolution of 10 n miles x 10 n miles x 10 days), but are based on the original ... were consistently reported, but at lower levels compared to the earlier days (with exception of a ... CPUEs were at the lower end of the Japanese CPUEs. Another point worth noting is that there seemed to ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 117–141 : Auteur(s): Kawaguchi, S., S. Nicol, K. Taki and M. Naganobu

9. Natural mortality rate in the mackerel icefish (Champsocephalus gunnari) around South Georgia

   South Georgia Abstract / Description:  Information on natural mortality rates of the mackerel icefish ... careful consideration of the data and available methods, several errors are noted in earlier estimates ... . Unfortunately, because none of the datasets are sufficiently comprehensive, it is impossible to unequivocally ... order to try to provide a reasoned estimate of M. MATERIAL AND METHODS Data on numbers of fish at ... of fish in the sample, the first fully recruited age is coded zero, the numbers at each coded age ... (1975): M = 0.28 (assuming N,W, max at 7 years). DISCUSSION Robustness of Estimators Seber (1982 ... criterion has not been met (Table 1). Unfortunately, the pattern of size at age reported by Olsen (1955 ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 245–257 : Auteur(s): Everson, I

10. Potential nursery areas for fish in the Prydz Bay region

    for the shelf area of the Bay to be a nursery ground for nototheniid and channichthyid fish. Nearly ... break. The dominant size class was of 45 mm standard length, which corresponds to an age of 1 ... of the shelf. Although no specific nursery grounds were identified, the whole of the Prydz Bay shelf ... 7 to 8 m high, and nets were towed at fishing depth for a standard haul duration of 30 minutes at 3 ... at 30 mile intervals covering the entire shelf area of Prydz Bay, the banks to the west as far as ... not numerous, except in one station near the shelf edge at the eastern side of the bay (Figure 4). A ... in January/February 1991 indicated the potential for the shelf area of the Bay to be a nursery ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 369–380 : Auteur(s): Williams, R.

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