Résultats de la recherche

1. Choosing distance between acoustic survey tacks

   analysis of data from actual hydroacoustic surveys. The model consists of two parts, one imitating ... , ~ , ~,,~" !,I I6~,\ :::::;::""""-1:~:,~ 30~ ~ <: I:' · .. . I·"'t:':::::"............ --=:z"=~ 20% '= I,' 7 ... relationship of the relative biomass assessment error ° (in fractions of one) to the density values ... a field characteristic in choosing tack frequency. Hence, if two fields having different ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 153-164 : Auteur(s): Kalikhman, I.L., Z.I. Kizner, B.R. Zaripov and W.D. Tesler

2. Seal mitigation measures on trawl vessels fishing for krill in CCAMLR Subarea 48.3

   season. These approaches, aimed at reducing seal entanglements, are similar to the two systems ... where the headrope and groundrope connected to the warps. Two mesh planes, 44 m in width and 20 m in ... 140 mm outside mesh 90 mm outside mesh 1.6 m mesh opening 80 m from wings to otterboards GR HR ... seal entanglements, are similar to the two systems implemented by Japanese vessels during the 2003 ... device, seal entanglements were recorded for the fi rst two trawls. As a result, the gear was modifi ed ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 195–205 : Auteur(s): Hooper, J., J.M. Clark, C. Charman and D. Agnew

3. Depth distribution and spawning pattern of Dissostichus eleginoides at South Georgia

   both up and down slope at particular times of year. Months with a high mean length at depth are May and ... year to year, but in 1998 there seem to have been two spawning events. The first was in late April ... , suggesting movement of animals both up and down slope at particular times of year. Months with a high mean ... . When this fishery started in 1989, fishing was conducted year round (CCAMLR, 1998). However ... has been no suggestion of a massive concentration of effort in one small area. However, the fishery ...

   Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 19–36 : Auteur(s): Agnew, D.J., L. Heaps, C. Jones, A. Watson, K. Berkieta and J. Pearce

4. Long-term trends in the foraging patterns of female Antarctic fur seals at South Georgia

   number of feeding trips, with 1979 being the year with the fewest trips made during the entire 20 year ... ) the number of feeding trips made by an individual’&#039;s mother during lactation. This analysis ... teeth from Bird Island, South Georgia, was analyzed to estimate: 1) birth year of individuals, and 2 ... feeding trips, with 1979 being the year with the fewest trips made during the entire 20 year period ... from Bird Island, South Georgia, was analyzed to estimate: 1) birth year of individuals, and 2) the ... voyages ont ete les moins nombreux sur la periode de 20 ans. Sous presse dans Sahrhage, D. (ed ... viajes hechos durante todo el periodo de 20 anos. En prensa en: Sahrhage, D. (ed). Antarctic Ocean and ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 441-443 : Auteur(s): Bengtson, J.L.

5. Sources of variance in studies of krill population genetics

   taken within one region. This has important implications for the design of future studies of krill ... 98 6 4 al lo zy m e lo ci 20 2, 1 90 , 1 97 , 1 96 , 1 89 , 1 98 N o d if fe ... Southern Ocean. From one site in the Mertz Glacier Polynya, krill had been captured in two net tows at ... ’S 68º55’W) in January 1999 (austral summer). Two samples (n = 59, 47) were collected from the ... Mertz Glacier Polynya (66º23’S 145º54’E; 66º29’S 146º1’E) during September 1999 (winter). One sample ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 107–116 : Auteur(s): Jarman, S.N. and S. Nicol

6. Exploratory fishing for Dissostichus spp. in the Antarctic region (Subareas 48.1, 48.2 and 88.3)

   (Latitude 68°49&#039;S), and from the Bellingshausen Sea (70°38&#039;S) to Clarence and Elephant Islands (61 ... °14&#039;S), while Patagonian toothfish (Dissostichus eleginoides) were caught in waters from King ... George Island in the South Pacific Ocean (61°24&#039;S) to the Scotia Sea in the South Atlantic (58°03 ... &#039;S). Yields of Dissostichus spp. were very low in the three subareas, with values of only 5.7 g ... . However, the results obtained make it possible to identify two fish groups in the study area. One group ... . Male 1 60 17 Female W 50 m - E 40 2 30 20 10 0 0 1 2 3 4 Repletion index Figure 6 ... (70°38'S), while D. eleginoides was caught to the north of 61°30'S, and also around the South Orkney ... results obtained from five longline sets in the Antarctic region (60°53'-61'58's and 54'47'-60°20'W) at ...

   Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 1–17 : Auteur(s): Arana, P.M. and R. Vega

7. Bias in the estimation of krill yield from using a deterministic formulation of the median unexploited spawning biomass

   median unexploited spawning biomass Abstract / Description:  Two Monte Carlo simulation models, the krill ... perio . Table 2: Escapement of spawning biomass at the end of 20 and 30-year projections for different ... and for three levels of y - 0.15, 0.2 and 0.4. Projections for 20 years and 30 years were undertaken ... spawning biomass after 20 and 30 years relative to median So in each run with no fishing was 1.099 and ... : The probability of depleting the spawning biomass during 20-year projections for different levels of y ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 1–8 : Auteur(s): Constable, A.J. and W.K. de la Mare

8. Myctophids in the diet of Antarctic predators

   - seven, Bathydraconidae- two and Rajidae- one), 18 species of birds (penguins- seven, albatrosses- four ... , petrels- five, prions- one and cormorants- one) and two species of seals. Myctophids in the diet of ... found in the diet of one species of squid, 18 species of fish (Nototheniidae- eight, Channichthyidae ... predatory species are represented by 16 species of genera Krefftichthys (one species), Protomyctophum (four ... fish (Nototheniidae - eight, Channichthyidae - seven, Bathydraconidae - two and Rajidae - one), 18 ... fish (eight Nototheniidae, seven Channichthyidae, two Bathydraconidae and one Rajidae), 18 species of ... birds (penguins - seven, albatrosses - four, petrels - five, prions - one and cormorants - one) and two ... of one species of squid, 18 species of fish (eight of Nototheniidae, seven - Channichthyidae, two ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 335–368 : Auteur(s): Sabourenkov, E.

9. Statistical problems in krill stock hydroacoustic assessments

   :  Two primary issues are at question for hydroacoustic assessments of krill. The first is the methods ... issue of patchy years vs more even distribution would seem to have more impact on ecosystem management ... distributed. Consider as a test case that we have two surveys in two consecutive years giving identical ... HYDROACOUSTIC ASSESSMENTS M.C. Macaulay Abstract Two primary issues are at question for hydroacoustic ... hydroacoustic survey (one sample per second), there sometimes is a lack of independence between samples due to ... zooplankton and fish) may swim fast enough in a single day to traverse from one transect to another and hence ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 301–309 : Auteur(s): Macaulay, M.C.

10. Modelling krill recruitment

    rate from one age class to the next, which is given by: If M is assumed to be independent of age up ... estimated. MODEL DEVELOPMENT In modelling a krill population we need, in each year of a simulation, a ... the quotient of two random variables, and hence the delta method expansion for the variance of (2 ... the recruitment in each year is randomly and independently distributed, then it can be shown that ...

    Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 49–54 : Auteur(s): W.K. de la Mare

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