Resultados de la búsqueda

1. Acoustic data analysis and models of krill spatial distribution

   wavenumber spectrum resembles a white noise at scales of 2-20 km, although at scales smaller than 1 km the ... distribution of krill biomass is bimodal and appears to be the mixture of two log normal distributions. These ... two distributions may correspond to the between and within patch biomass. These results of data ... animal swarm size is the one that maximized the entropy subject to given information or constraints ... - Figure 5: 80'- :r 50 40 30 201- 10H 1111111111111111111111111 0 1.5 -0.5 0.5 2.5 3.5 0 1 ... spectrum resembles a white noise at scales of 2-20 km, although at scales smaller than 1 .km the spectrum ... distribution of krill biomass is bimodal and appears to be the mixture of two log normal distributions. These ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 311–329 : Autor(es): Morin, A., A. Okubo and K. Kawasaki

2. 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 ... about two-thirds of the sampled fish could not be sexed. Precision estimates and age bias plots ... derived for both sexes combined are: L ∞ 22.1 cm SL; K 0.167 y –1; t 0 –0.4 years. Parameter estimates ... –11.0 and 15.1–15.5 cm. Mean lengths of 4.9 and 7.3 cm (at ages 1.3 and 2.3 years respectively) are ... 15 25 20 15 10 5 0 S ta nd ar d le ng th (c m ) Age (years) 0 3 ... 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 ... aged Antarctic silverfish sampled from the Ross Sea. 0 5 10 15 20 25 30 35 4.0-4.5 5.1-5.5 ... year of reader 1’s first readings, and none dif- fered by more than 3 years. The between­reader APE ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 75–86 : Autor(es): Sutton, C.P. and P.L. Horn

3. Age, growth and mortality of Patagonian toothfish (Dissostichus eleginoides) caught off Kerguelen

   estimated to be –0.6 years and residual variance 2.9. Age distributions of toothfish caught by two vessels ... trawlers and longliners at Kerguelen, and longevity was estimated to be 36 years. Total instantaneous ... Paper Title:  Age, growth and mortality of Patagonian toothfish (Dissostichus eleginoides) caught ... otoliths from reference collections were used to measure precision; relative bias for the age data was ... 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 ... 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 ... ge ( ye ar s) 0 10 20 30 40 50 (a) (b) Ashford et al. 38 Figure 2: Age structure of ... 20 30 40 50 0 20 40 60 80 N um be r of fi sh 0 10 20 30 40 50 0 10 20 30 40 50 60 N ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 29–41 : Autor(es): Ashford, J., G. Duhamel, C. Jones and S. Bobko

4. Using ecosystem monitoring data to detect impacts

   within a few years of its onset, but a fixed reference point method could have provided this sustained ... if at ≤ acrit in two or more years of a four-year refer- ence period. Summary of methods: anomalies ... combinations of so events that could occur in t years is given by: ! !( )!o o o t t s s t s æ ö÷ç ÷=ç ÷ç ... . Any observation at will have one of two possible states relative to acrit. These states are α1 (at ... ). Thus, an impact is inferred if state α1 is observed in s ≥ scrit years where scrit = n.p2. The ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 197–212 : Autor(es): Hill, S.L., J. Forcada, P.N. Trathan and C.M. Waluda

5. Krill population biology during the 1991 Chilean Antarctic krill fishery

   size from 1.5 to 3 cm). Two subsamples of 100 specimens each were taken from 50 samples and analysed ... . The fishing ground was divided into two areas: Area A, north of the South Shetland Islands; and Area B ... 419 hauls. In Area A, a unimodal size frequency distribution was found; the size range was between 30 ... spermatophore had a 36.5 mm TL, 80% of the females with spermatophores had a TL larger than 45 mm. In Area B, a ... them; sizes were between 20 and 55 mm TL and a bimodal distribution was found. Two maximum frequencies ... ' 59°55,3' 2.60 58 14 21:30 21.02.91 62°08,1' 59°51,5' 2.40 50 20 09:30 22.02.91 62°08,9' 59°56,4 ... °17,6' 2.70 50 30 18:20 03.03.91 62°26,0' 61 °17,8' 2.80 40 39 08:30 04.03.91 62°33,5' 61 °22,7' 2.90 ... :40 06.03.91 62°40,5' 61 °26,0' 2.60 40 81 17:10 07.03.91 62°41,0' 61 °21,5' 2.70 40 90 10:20 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 223–235 : Autor(es): Mujica R., A., E. Acuña S. and A. Rivera O.

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

   tonnes per fishing hour) is, however, lower than those observed for the two preceding cohorts (1979 and ... from the Kerguelen Shelf from 1979/80 to 1988/89. S: Southern sector SE: Southeastern sector 161 ... abundance of the two stocks is observed, taking into account the fact that these are juvenile fish of age ... (at the age of 5 to 6 years) of these juveniles on the shelf. A catch limited to by-catches has ... =33.4 cm), very close to average length at sexual maturity (33.5 and 33.8 cm at the age of 9 years ...

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

7. 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 ... estimated to be from fish 1+ or 2+ years old, with mean total lengths of 32.5 cm and 41.3 cm respectively ... . No difference was found between predicted and estimated ages. We conclude that the two dominant modes ... Paper Title:  Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides) Abstract ... 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 ... 80 0 10 20 30 40 50 60 70 80 0 10 ... 20 30 40 50 60 70 80 0 10 20 30 ...

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

8. Distribution of krill (Euphausia superba Dana) catches in the South Shetlands and South Orkneys

   catch in Subarea 48.1 from December to March was taken within 40 km of the coast, and 90% within 80 km ... South Orkneys Abstract / Description:  A set of concentric zones of 20 km width was defined around ... in all years 1988 to 1991. In 1987, 1988 and 1991, 75% of the catch in Subarea 48.2 between December ... and March was taken within 80 km of colonies in the South Orkneys. Estimates of consumption rates ... for Subareas 48.1 and 48.2. 100 90 80 .c. 70 J:! tfJ 0 () 50 -0 40 a-e 30 20 10 ... March was taken within 40 km of the coast, and 90% within 80 km in all years 1988 to 1991. In 1987 ... effectuee a moins de 40 km de la cote, et 90% a moins de 80 km de 1988 a 1990. En 1987 et 1988, de decembre ... 48.1 C ,l{eKa6p51 no MapT 6bIJIO nOJIY'-IeHO B pa,l{Hyce 40 KM OT 6epera H 90% B pa,l{Hyce 80 KM OT ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 287–303 : Autor(es): Agnew, D.J.

9. Quantifying movement behaviour of vessels in the Antarctic krill fishery

   / Description:  Ten years of recent fine-scale haul-by-haul krill data were used to characterise the behaviour ... analyses demonstrate the need for high-quality year-round data on all vessels participating in the krill ... markedly over the last 20 years (Kawaguchi and Nicol, 2007). Models of the interactions between the ... of each haul, assuming 60 n miles for one degree latitude and 30 n miles for one degree longi- tude ... . The range of area considered in this paper was between 50°S–70°S and 70°W–30°W. Catch rates (Cn/tn ... . Document WG-EMM-05/30. CCAMLR, Hobart, Australia. Kawaguchi, S., S. Candy, S. Nicol, K. Taki and M ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 131–148 : Autor(es): Kawaguchi, S. and S.G. Candy

10. The survivorship of rays discarded from the South Georgia longline fishery

    -1 0 1 2 sex F M length s( le ng th ) 70 80 90 100 110 -2 -1 0 1 2 3 pa rti al fo r l ... 12 hours, adjusted for the ‘50% survivorship’ category of Table 1. 0% 20% 40% 60% 80% 100 ... % 1100–1299 1300–1499 1500–1699 1700–1900+ Depth zone (m) S ur vi vo rs hi p (% ) 100 80 60 40 ... 20 0 Endicott and Agnew 160 Table 4: Results of a binomial GLM in S-plus examining the ...

    Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 155–164 : Autor(es): Endicott, M. and D.J. Agnew

Páginas