Search results
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Target strengths of krill at 136 and 20 kHz
Paper Title: Target strengths of krill at 136 and 20 kHz Abstract / Description: Estimation ... the mean single-krill target strengths range from-71 to-77 dB at 20 kHz. Trawl hydroacoustic method ... Target strengths of krill at 136 and 20 kHz ... lengths from 43 to 47 mm the mean single-krill target strengths range from -71 to -77 dB at 20 kHz. Trawl ... : • frequency 20 kHz: aluminium, diameter 120 mm, TS = -30.92 dB • frequency 30 kHz: brass, diameter 100 mm, TS ... :20 1.3 -74.3 -75.4 53.9 3.9 1.19 20:30 0.14 -77.5 -69.0 54.2 5.7 1.23 Maude Rise area (February ... Encaged krill 136 TS = 0.39L - 86.50 (4) 0.87 Encaged krill 20 TS = 1.27L - 131.30 (5) 0.84 Trawl ... % 24 21 18 15 I2 . 9 6 3 0 10 20 30 40- 50 Figure 1. Krilllength composition. South ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 141–157 : Author(s): Kasatkina, S.M.
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Effects of weather and sea-ice on the reproductive performance of the Adélie penguin at Edmonson Point, Ross Sea
/99 0 2 4 6 8 10 12 14 16 N u m b e r o f d e a d c h ic k s 0 10 20 30 40 ... 0 2 4 6 8 10 12 14 16 N u m b e r o f d e a d c h ic k s 0 10 20 30 40 50 60 70 80 ... 7/1 17/1 27/1 6/2 16/2 N u m b e r o f d e a d c h ic k s 0 10 20 30 40 50 60 70 80 ... : comparison between years. J. Anim. Ecol., 62: 634–646. Watanuki, Y., A. Kato, Y. Naito, G. Robertson ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 99–109 : Author(s): Olmastroni, S., F. Pezzo, V. Volpi and S. Focardi
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Scientific observations in CCAMLR fisheries – past, present and future
CCAMLR, 2004b). 0 10 20 30 40 50 60 1996 1997 1998 1999 2000 2001 2002 2003 2004 CCAMLR season ... principles outlined in Article II of the CAMLR Convention (CCAMLR, 2004a, Part 1) embody an ‘ecosystem ... . The provisions of Article II require that management of harvesting should aim to conserve not only the targeted ... has interpreted Article XXIV of the Convention as ‘requiring the implementation of a system of inter ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 81–98 : Author(s): Sabourenkov, E.N. and E. Appleyard
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Champsocephalus gunnari stock status in the South Georgia area
. The recruitment was taken at the lowest possible level for all these years (400 million specimens). Catch-per-unit ... intensity was F 0.1. In the first two cases TAC=25-30 thousand tonnes and stock size does not change ... . The recruitment was taken at the lowest possible level for all these years (400 million specimens). Catch-per-unit ... fishing intensity was F0.1. In the first two cases TAC=25-30 thousand tonnes and stock size does ... 0,35 1,44 1,69 5,75 10,11 0,35 0,53 059 1,26 3,40 60.00 100.90 129.30. 67.20 ... 26_10 818_30 60_20 llpHMeqaHHe: llHCJIeHHOCTb 1-0M B03pacTHoM rpynnbI B TepMHHaJIbHbIM, nepBbIM ... these years (400 million specimens). Catch-per-unit-effort was also taken at the lowest level. T AC ... -30 thousand tonnes and stock size does not change. For the third case T AC= 14-18 thousand tonnes ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 1-18 : Author(s): Borodin, R. and P. Kochkin
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An assessment of the exploratory fishery for Dissostichus spp. on BANZARE Bank (CCAMLR Division 58.4.3b) based on fine-scale catch and effort data
Dissostichus spp. du banc BANZARE (division 58.4.3b de la CCAMLR). Cet article présente un résumé des données ... of highly concentrated effort and a third area of less con- centrated effort, together accounting for 80 ... % of all effort within a combined area of 53 000 km2 over the life of the fishery. Together ... in 2003/04, 49 (2.4%) were excluded from analysis due to missing data. Of these, 20 events had no data ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 55–78 : Author(s): McKinlay, J.P., D.C. Welsford, A.J. Constable and G.B. Nowara
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Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides)
to be from fish 1+ or 2+ years old, with mean total lengths of 32.5 cm and 41.3 cm respectively ... in the length density represent different age cohorts separated by one year. File: 01ashford.pdf ... 1+ or 2+ years old, with mean total lengths of 32.5 cm and 41.3 cm respectively. No difference was found between ... represent different age cohorts separated by one year. ... 1+ and 2+ years old respectively. A much smaller peak at TL ca. 20 cm contained fi sh 0+ years old. Similar ... 36–40 cm). Prop. = proportion. TL Age 0+ 1+ 2+ 3+ 4+ 5+ 6+ 7+ 14+ 20 4 25 2 30 12 1 35 102 7 40 ... 20 30 40 50 60 70 80 ... 90 Fr eq ue nc y 40 30 20 10 0 Figure 2: Length frequencies for the sample of Dissostichus ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 1–10 : Author(s): Ashford, J., C. Jones, S. Bobko and I. Everson
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Seabird interactions with longlining operations for Dissostichus eleginoides around South Georgia, April to May 1994
-seven line sets were observed and 98 deaths of seabirds were recorded over 20 sets; no deaths occurred ... to albatrosses. The average mortality rate for the 20 sets was 0.48 birds/1 000 hooks and maximum mortality 3.12 ... were recorded over 20 sets; no deaths occurred during hauls. The 16 sets made at night contributed 15 ... population at South Georgia when compared to albatrosses. The average mortality rate for the 20 sets was 0.48 ... , and the number of birds of each species in the vicinity of the ship was recorded every 30 minutes. Of the 20 ... 04.43 06.20 19.40 04.30 05.53 03.49 05.25 06.50 18.05 I set 7; streamer B used in 02.05 03.42 05.05 ... 18.30 06.35 4 Incl. 2 GHA, 1 BBA, l GP 14.44 16.31 16.26 18.08 09.30 11.25 20.47 22.28 21.55 23.27 ... . These occurred in aggregations of 20 to 30 birds, flying in and diving at the line within 30 m of the stern ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 111–121 : Author(s): Ashford, J.R., J.P. Croxall, P.S. Rubilar and C.A. Moreno
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The sensitivity of multiple output statistics to input parameters in a krill–predator–fishery ecosystem dynamics model
multiple stochastic simulations of 40 years nominally beginning in 2007 and par- titioned into 20 years ... ., 2004; Hill et al., 2007a; Plagányi and Butterworth, 2012). CCAMLR Science, Vol. 20 (2013): 97–118 ... Vectors 4 18 1 2 144 Catch Vectors 1 15 1 2 30 Threshold density Vector 1 15 1 15 Available fraction ... modelled areas, except for time series where it is the number of relevant modelled years (although ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 97–118 : Author(s): Hill, S.L. and J. Matthews
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Beyond MSY: a consideration of definitions of management objectives
in Article II of the CCAMLR Convention. The criteria will depend on whether the main concern ... out in Article II of the CCAMLR Convention. The criteria will depend on whether the main concern ... realistic population models, taking account of the objectives set out in Article 11 of the CCAMLR ... a l'Article II de la convention de la CCAMLR. Les criteres varieront selon que l'interet principal portera ... and industry. In later years it has come under increasing criticism. Economists have felt that it does ... thought of in two parts. For the first few months or years of life, as eggs, larvae or juveniles ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 299-322 : Author(s): Gulland, J.A.
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Analysis of the diet of Champsocephalus gunnari at South Georgia in late summer from 1994 to 1997, Dr Eduardo L. Holmberg surveys
and Thysanoessa sp., which are known to be important alternative food in years of krill scarcity, as well as fish ... , was only occasional or negligible and varied from year to year. The spatial distribution of the main prey ... 48.3, did not show a consistent pattern from year to year. Likewise, in the four surveys by the Dr ... in Subarea 48.3 during the period investigated can be defined as low in 1994 (equivalent to years of krill ... , 1995). In 1996 and 1997 fish between 16 and 20 cm predominated; in 1997 a peak between 25 and 30 cm ... (ranges 12-20 cm/l-2 years) was found in the catches during the RV Dr Eduardo L. Holmberg surveys over ... of C. gt~nnari was the lowest registered for cruises carried out over the last 30 years, even lower than ... to be important alternative food in years of krill scarcity, as well as fish, was only occasional or negligible ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 103–123 : Author(s): Barrera-Oro, E., R. Casaux and E. Marschoff