Résultats de la recherche

1. Review of length-weight relationships for Antarctic krill

   euphausiid species), are listed for ash-free dry weight, dry weight, and wet weight. The accuracy of length ... taken into account. The influence of seasonal changes on length-weight relationship parameters is ... over a short period during the spawning season (end of February to beginning of March 1985), when most ... eggs (Siege1, 1989). After the ovaries had recovered and during the winter resting stage there was no ... weight, dry weight, and wet weight. The accuracy of length-weight relationship calculations is improved ... when information on sex and dominant maturity stages is taken into account. The influence of seasonal ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 145–155 : Auteur(s): Siegel, V.

2. Improving estimates of Adélie penguin breeding population size: developing factors to adjust one-off population counts for availability bias

   point one week after the peak in egg laying, consistent with Standard Method A3 of the CCAMLR Ecosystem ... presented for the collection and development of data to adjust counts of Adélie penguins made at any time in ... the breeding season to an estimate of the breeding population. The development of ‘availability ... adjustment factors’ involves the collection of time-series counts of population objects, such as adults ... sufficient data to effec- tively capture the shape of the function. To this end, expert knowledge, in the ... reference point one week after the peak in egg laying, consistent with Standard Method A3 of the CCAMLR ... in the number of birds at the breeding colony as females leave the breeding site shortly after ... between first and last egg-lay. The number of occupied nests present after the last eggs have been laid ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 229–241 : Auteur(s): Southwell, C., J. McKinlay, L. Emmerson, R. Trebilco and K. Newbery

3. Supplementary data on exploited stocks in Division 58.5.1 (Kerguelen)

   1987 and 1988. After a continuous reduction in average length since the creation of the EEZ, a slight ... / Description:  The results of fishing cruises carried out from 1986/87 to 1988/89 in Division 58.5.1 (Kerguelen ... Island) have made possible a review of the status of the various harvested fish stocks. Since 1984, an ... average annual growth of 36% has been noted in the abundance of the juvenile section of the stock of ... 6). After a continued decrease in the average length observed between 1983/84 and 1986/87 (Duhamel ... DIVISION 58.5.1 (KERGUELEN) G. Duhamel Abstract The results of fishing cruises carried out from 1986 ... /87 to 1988/89 in Division 58.5.1 (Kerguelen Island) have made possible a review of the status of ... the various harvested fish stocks. Since 1984, an average annual growth of 36% has been noted in the ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 147–161 : Auteur(s): Duhamel, G.

4. Feeding patterns of nine species of Antarctic fish and assessment of their daily food consumption

   food consumption Abstract / Description:  Little is known about the feeding patterns of non-commercial ... fish species in Antarctic waters. The aim of this study is to collect information on the feeding ... patterns of several commercially non-targeted species in the Indian Ocean sector of the Southern Ocean ... : Nototheniidae (four species), Channichthyidae (three species) and Bathydraconidae (two species). The study ... (36 hours), y(O) and y(T) mean indices of stomach fullness at the beginning and end of observations ... * * Abstract Little is known about the feeding patterns of non-commercial fish species in Antarctic waters ... . The aim of this study is to collect information on the feeding patterns of several commercially non ... -targetted species in the Indian Ocean sector of the Southern Ocean: Nototheniidae (four species ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 321–333 : Auteur(s): Pakhomov, Y.A. and V.B. Tseitlin

5. Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides)

   / Description:  We used the otoliths from a sample of Dissostichus eleginoides pre-recruits, whose length ... the length modes observed. Length densities by age were compared graphically with the overall length ... estimated from reading otoliths in a goodness-of-fit test. The majority of the otoliths (83.6%) were ... . No difference was found between predicted and estimated ages. We conclude that the two dominant modes ... . Black dashes mark the edge of each yearly annulus (end of opaque zone and beginning of the following ... auxiliary information was made available to the readers until after completion of all readings of the ... Cambridge CB3 0ET, United Kingdom Abstract We used the otoliths from a sample of Dissostichus eleginoides ... otoliths were congruent with the length modes observed. Length densities by age were compared ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 1–10 : Auteur(s): Ashford, J., C. Jones, S. Bobko and I. Everson

6. Results of fish larvae sampling by means of fine-meshed samplers attached to a bottom trawl

   bottom trawl Abstract / Description:  Fine-meshed samplers were attached to the top of a bottom trawl in ... order to provide information on the composition, distribution and abundance of Antarctic fish larvae in ... the near-bottom zone, which is usually not sampled using plankton nets. The efficiency of various ... sized meshes for sampling larvae in the bottom zone and the resistance of the samplers to damage during ... , therefore, the 0.505 mm mesh inset was fixed in the end of the 12 mm samplers of larvae. After this change ... results for three different mesh sizes is given in Table 1. At the beginning of the bottom survey ... -meshed samplers were attached to the top of a bottom trawl in order to provide information on the ... composition, distribution and abundance of Antarctic fish larvae in the near-bottom zone, which is usually ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 69-86 : Auteur(s): Ślósarczyk, W. and I. Wójcik

7. An index of per capita recruitment

   recruitment (PCR) is proposed such that where R 1 is the proportion of age-l animals sampled in year y and M ... is the post-recruit mortality rate. The intent of the index is to facilitate investigation of ... reproductive success and the factors postulated to affect it. The formulation of PCR is based on the ... animals spawn; (iii) a representative sample of the population is available; and (iv) the proportion of ... to track cycles in recruits per spawner even after the introduction of random variability in ... where R1 is the proportion of age-l animals sampled in year y and M is the post-recruit mortality rate ... . The intent of the index is to facilitate investigation of reproductive success and the factors ... postulated to affect it. The formulation of PCR is based on the assumptions that: (i) post-recruit mortality ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 179–196 : Auteur(s): Hewitt, R

8. Significant intra-annual variability in krill distribution and abundance at South Georgia revealed by multiple acoustic surveys during 2000/01

   acoustic surveys of Antarctic krill (Euphausia superba) were conducted around South Georgia in the 2000/01 ... March 2001 (late-season). The surveys were the first in a newly planned five-year series of observations ... designed to complement and extend an existing time series regularly maintained by the British Antarctic ... Survey since 1996 (and on a more ad hoc basis since the early 1980s). We hoped that conducting several ... surveys at the very beginning and end of the fi eld season (October and March) in addition to the main ... survey using the full eight transects or just the four surveyed at each end of the season provides ... eastern end of the island, and that they are transported westwards along the northern coast, growing as ... around South Georgia in the 2000/01 season: in October 2000 (early-season); during late December/early ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 71–82 : Auteur(s): Brierley, A.S., C. Goss, S.A. Grant, J.L. Watkins, K. Reid, M. Belchier, I. Everson, M.J. Jessop, V. Afanasyev and J. Robst

9. Statistical power to detect changes in growth rates of Antarctic fur seal pups

   Abstract / Description:  Numerical simulations were used to investigate the power of methods for detecting ... changes (between years) in pup growth rates, the loss of power associated with obtaining weight samples on ... only three dates in a season, and potential means of increasing the power of the CCAMLR Ecosystem ... (60°59.5'S, 55°24.5'W), the simulations suggest that following the protocol of the Standard ... the first sample is weighed 30 days after mean pupping date, three additional samples at monthly (say ... 28-day) intervals would conclude on the 114th day after mean pupping. Thus, it seems that no more ... Numerical simulations were used to investigate the power of methods for detecting changes (between years ... ) in pup growth rates, the loss of power associated with obtaining weight samples on only three dates ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 399–409 : Auteur(s): Boveng, P., J.L. Bengtson and M.E. Goebel

10. Analysis of trends in Japanese krill fishery CPUE data, and its possible use as a krill abundance index

    krill abundance index Abstract / Description:  Haul-by-haul logbook catch and effort data from the ... Japanese krill fishery for the 1980/81 to 2003/04 fishing seasons were analysed. For a number of ... . The results strongly suggest that the krill fishery in the South Georgia area is operating at a ... critical level of krill availability which is just enough to maintain the best factory performance. In this ... then remained constant until the end of the fi shing season. Figure 7(b) shows CPST trends for each ... high end. TTPD and NTPD did not show any trends against CPST. For APEI (Figure 12), all the indices ... to increase at the high end of krill availability, and at the same time this was accompanied by a ... season. It stayed relatively constant ranging between 220 and 300 min until the 1992/93 season. After ...

    Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 1–28 : Auteur(s): Kawaguchi, S., S. Candy, S. Nicol, K. Taki and M. Naganobu

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