Résultats de la recherche
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Measurements of differences in the target strength of Antarctic krill (Euphausia superba) swarms at 38 kHz and 120 kHz
Paper Title: Measurements of differences in the target strength of Antarctic krill (Euphausia ... superba) swarms at 38 kHz and 120 kHz Abstract / Description: Differences in the target strength of adult ... differences in the mean back-scattering strength of swarms simultaneously insonified at these two frequencies ... in studies off the South Orkneys and Elephant Island in March 1990. Back-scattering strengths at 120 ... -scatter from aggregations of encaged animals which varied in mean length from 30 to 39 mm. Calculated ... ~ Z 30 « o "" ~ ~ 20 Z 10 .' . -I, - A9880 /' 1\ --- A9885 1\ •••• A9891 ... WG-KRILL-90/28 MEASUREMENTS OF DIFFERENCES IN THE ... * * Abstract Differences in the target strength of adult (36 to 60 mm) Antarctic krill (Euphausia superba ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 75–86 : Auteur(s): Hampton, I.
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A review of the effectiveness of streamer lines as a seabird by-catch mitigation technique in longline fisheries and CCAMLR streamer line requirements
technique in longline fisheries and CCAMLR streamer line requirements Abstract / Description: Based to a ... large degree on the precedent set by CCAMLR in 1991, the streamer line has become the primary, and most ... commonly prescribed, seabird mitigation device in world longline fisheries. This paper reviews CCAMLR ... streamer line requirements (Conservation Measure 25-02 (2002), formerly Conservation Measure 29/XIX) in ... line: UW IW-50 Two streamer lines: IW-50+Cannon 10 20 30 40 50 ... found effective in Alaska and met these criteria. Cord (required by Conservation Measure 25-02 (2002 ... 100% compared to a control of no deter- rent over two years in the sablefi sh and Pacifi c cod fi ... TECHNIQUE IN LONGLINE FISHERIES AND CCAMLR STREAMER LINE REQUIREMENTS E.F. Melvin Washington Sea Grant ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 189–201 : Auteur(s): Melvin, E.F., B. Sullivan, G. Robertson and B. Wienecke
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Notothenia (P.) guntheri stock status and TAC estimation in the area of Shag Rocks (Subarea 48.3)
commercially taken age groups (2-4 years); (b) Fishing intensity in the predicted period is at the level of ... Paper Title: Notothenia (P.) guntheri stock status and TAC estimation in the area of Shag Rocks ... consideration the fact that in the 1986/87 season the recruitment in the first age group was not abundance of N ... . guntheri in 1987/88 was 152 thousand tonnes. Then the following TAC values were obtained: (a) Fishing ... age groups (2-4 years); ( b) Fishing intensity in the predicted period is at the level of 1987/88 ... individuals of different age, in different years. Age composition of catches (specimens). Fishing ... mortality coefficients. N. guntheri abundance in different years (millions of individuals). N. guntheri ... TAC ESTIMATION IN THE AREA OF SHAG ROCKS (SUBAREA 48.3) K. Shust and R. Borodin Abstract Data ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 53-68 : Auteur(s): Shust, K. and R. Borodin
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Abundance, size and maturity of krill (Euphausia superba) in the krill fishing ground of Subarea 48.1 during the 1990/91 austral summer
Paper Title: Abundance, size and maturity of krill (Euphausia superba) in the krill fishing ... sampling surveys for krill were conducted in the krill fishing ground north of the South Shetland Islands ... from 18 January to 3 February 1991. Distinct offshore-inshore heterogeneities in abundance and maturity ... and nearshore zones. The mean density of krill was low in the oceanic zone (8.5 g/m 2), intermediate ... 1991 (Figure 1). Transects ran in an offshore-inshore direction with 20 n miles between the transects ... the depth range of 30 to 40 m in this region (Anon., 1989). Therefore each buoy was deployed with a ... zones. Small krill (modal length 30 mm) were scarce except in the nearshore zone where they represent ... density in early summer influenced krill-eating predators at Seal Island: 20% decline in the number of ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 183–199 : Auteur(s): Ichii, T., H. Ishii and M. Naganobu
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A comparison between otoliths and scales for use in estimating the age of Dissostichus eleginoides from South Georgia
Paper Title: A comparison between otoliths and scales for use in estimating the age of ... result in large errors in age data for long-lived species, usually due to compression of scale circuli ... reader was biased. Residual variances indicated one reader was relatively more precise than the other in ... the two readers in estimating the age of D. eleginoides using otoliths and scales. File: 05ashford ... . Sustainable exploitation rates should have been 20-30% of that based on age determinations from scales, in ... use of otoliths and scales in estimating tootlifish age 0 10 20 30 40 50 10 20 30 40 50 Reader l ... years. However, a validated age method using otoliths demonstrated that fish in the commercial fishery ... in fact ranged between 4 and 40 years, indicating slower growth and a much less productive fishery ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 75–92 : Auteur(s): Ashford, J.R., S. Wischniowski, C. Jones, S. Bobko and I. Everson
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Results of Soviet investigations of the distribution and ecology of pelagic squids (Oegopsida) in the Southern Ocean
specimens of that total were identified as Brachioteuthis riisei. In recent years (1978-1984) the collection ... (Oegopsida) in the Southern Ocean Abstract / Description: The USSR has carried out a long-term investigation ... of the distribution and ecology of pelagic squids (Oegopsida) in the Southern Ocean. In 1965–1977 a ... in Antarctic waters and data on squid beaks taken from sperm whale stomachs were also considered. Up ... with a speed of 5-20 cm/sec in the 200-J000/3500 m layer and according to the results of the ... production of which amounts to up to 1.2 milliard tons a year. This type - 99 - of fish also prevails in ... °-30°S) north of the Antarctic Convergence exceeds lOO/m2 and their number is up to 10000/m 2 in ... . 125 specimens of that total were identified as Brachioteuthis riisei. In recent years (1978-1984 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 79-111 : Auteur(s): Lubimova, T.G.
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Changes in biomass of eight species of finfish around the South Orkney Islands (Subarea 48.2) from three bottom trawl surveys
Paper Title: Changes in biomass of eight species of finfish around the South Orkney Islands ... the South Orkney Islands (Subarea 48.2) suffered substantial declines from split-year 1977/78 to 1989 ... Germany in 1985, Spain in 1991 and the USA in 1999. From these surveys, estimates of total stock biomass ... were computed for the eight species of finfish which were most abundant in catches. Biomass levels and ... the three examined, with a total of 139 hauls made: 20 in the 50-150 m stratum, 42 in the 150-250 m ... survey are presented in Kock (1986). A total of 30 hauls were made: 3 in the 50-150 m stratum, 9 in the ... conducted during daylight hours. The target time for a haul was 30 minutes, with any haul less than 20 ... that this was met in all three surveys and for all species. A measure of departure from this ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 53–74 : Auteur(s): Jones, C.D., K.-H. Kock and E. Balguerías
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Phytoplankton distribution in the mixed layer: implication to krill abundance
Paper Title: Phytoplankton distribution in the mixed layer: implication to krill abundance ... distribution of phytoplankton in the Antarctic Ocean. Since little is known about mixed layer dynamics in the ... model. Available CTD data suggest that the mixing in the upper layer is less than what we expected ... . However, the effect on the dynamics is vital, affecting the distribution of particles in the upper ocean ... the mixed layer in the Pacific water, north of the front, ranges between 30 and 50 meters. A sharp ... model is extensively used in simulating particle diffusion and animal aggregation. Skellam (1951) uses ... is shown beneath buoyancy frequency profile. 343 o 10 20 30 40 .5: 50 0+- D.. (J ... -0 10910 Ne 10910 N e 0 1 2 3 4 0 1 2 3 4 0 0 10 10 20 20 30 30 40 40 /""'. E ...
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
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Composition and characteristics of ichthyofauna in pelagic waters of South Georgia (Subarea 48.3)
Paper Title: Composition and characteristics of ichthyofauna in pelagic waters of South Georgia ... trawl census surveys conducted in Subarea 48.3. From 1984 to 1990 daily sampling stations aimed at ... ichthyocenosis in the subarea consisted of pelagic fishes (mainly Myctophidae), distributed at a depth range of ... 250 to 300 m, as well as demersal fishes in the pelagic stage of their life cycle. Catches contained ... caught years from 1 to 20% (Figure 9, Table 4). diurnally in the 60 to 85-metre near-bottom layer ... in the years of strong year classes and fishing mortality represents only a minuscule fraction of ... of 30 to 50 m (bottom depth in the area - 130 to 143 m) to the south and southeast of Black Rock ... : Numerator - the length of 'uveniles in age-group 1 Denominator - length of Ash older than l year Extreme ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 125–164 : Auteur(s): Frolkina, G.A., M.P. Konstantinova and I.A Trunov
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Potential impacts of bottom trawling on benthic communities in Prydz Bay, Antarctica
Paper Title: Potential impacts of bottom trawling on benthic communities in Prydz Bay, Antarctica ... Abstract / Description: This paper presents data on benthos retrieved in bottom trawls during a survey of ... demersal finfish species in Prydz Bay by Australia in the 1990/91 season. The data collected are used to ... examine a potential impact of bottom trawling on benthic communities in this region. The benthos was ... unfished areas in the South Atlantic and suggested that bottom trawling in the past 20 years has had a ... fish were mostly less than 20 kg. Catches in the centre of the bay (stations L, M and N) were very low ... Bay in February 1991 showed that on most occasions the biomass of benthos in the codend after a 30 ... tomar medidas que salvaguarden su integridad. 1. INTRODUCTION In the last 10 years, a number of ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 403–410 : Auteur(s): Constable, A.J.