Resultados de la búsqueda

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

   Paper Title:  Age, growth and mortality of Patagonian toothfish (Dissostichus eleginoides) caught ... off Kerguelen Abstract / Description:  Ages of Patagonian toothfish (Dissostichus eleginoides) caught ... 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 ... data, the proportions of the population at each age were calculated (Fridriksson, 1934; Kimura, 1977 ... Nt is the number of fi sh at age t, and N0 is the number of fi sh in the fi rst year class. Data ... were distributed differently between vessels, and no estimates of gear-specifi c catchability-at-age ... testing (Table 4). Discussion The method of age estimation developed at CQFE was applied to process ...

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

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

   the line at the sea surface, so as to maximise their chances of survival. Results from this experiment ... Paper Title:  The survivorship of rays discarded from the South Georgia longline fishery Abstract ... / Description:  Post-haulage survival experiments were conducted on 95 Raja sp. anon. cut off longlines at the ... season in Subarea 48.3. Capture depth had a consistently significant influence on the mortality of skates ... be cut from the line at the sea surface, so as to maximise their chances of survival. Results from ... level), making use of the pres- ence of scientifi c observers on board commercial vessels fi shing at ... only one skate at a time would be placed in a tank, with a maximum of eight skates being tanked at ... any one time. At the time of placement of each skate into the experimental tank, the following data ...

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

3. Some comments on the procedure for testing estimators of krill abundance which utilise survey data

   Paper Title:  Some comments on the procedure for testing estimators of krill abundance which ... utilise survey data Abstract / Description:  Since krill distributional data do show evidence of spatial ... correlation, estimators of abundance which attempt to model such effects (such as those based on Kriging ... computer generation of krill distribution patterns, which are compatible with existing information on the ... estimation from surveys of marine resources is to place a set of transects at random in the area of interest ... distribution was definitely non-random at the scale of the whole area surveyed, although there were ... indications of randomness at a smaller scale. Accepting therefore that krill distributions do exhibit ... discussed in Miller and Hampton, 1989b) under the assumption of a random distribution at each level. Two ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 191–205 : Autor(es): Butterworth, D.S., D.L. Borchers and D.G.M. Miller

4. Potential impacts of bottom trawling on benthic communities in Prydz Bay, Antarctica

   examined in trawls at 14 of the 22 random stations providing representative samples from different areas in ... greater than 1 at 12 out of the 14 stations and was mostly greater than 10. The results of this study ... 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 ... trawling on benthic communities in this region. The benthos was examined in trawls at 14 of the 22 random ... . The wet-weighed ratio of benthos to finfish in the codend was greater than 1 at 12 out of the 14 ... 30 minutes at 3 knots. The sweeps (25 mm diameter combination rope) were 25 m long. The length of ... bottom. The benthos was examined in the trawls at 14 of the 22 stations (see Table 1, Figure 1 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 403–410 : Autor(es): Constable, A.J.

5. Age determination of Notothenia gibberifrons from the South Shetland Islands, Antarctic Peninsula subarea (Subarea 48.1)

   Paper Title:  Age determination of Notothenia gibberifrons from the South Shetland Islands ... Notothenia gibberifrons specimens collected at two localities near the South Shetland Islands (Low I. and ... Potter Cove, 25 De Mayo/King George I.). Samples consisted of small and medium sized fish (total length ... scale readings gave a result of one year more. This could arise from the difficulty in differentiating ... workshop held in Moscow in July 1986, and at the annual Scientific Committee meetings. As a result of the ... * were obtained at two localities of South Shetland Is. (Figure 1) according to following detail ... of the species. Our samples at Low I. were taken offshore, while Potter Cove is a fjord (shallow ... 10 years and from 5 to 13 years, respectively. Comparison of mean length at certain age groups ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 143-160 : Autor(es): Barrera-Oro, E.

6. Analysis of haul data from the South Georgia krill fishery

   abundance indices that are sensitive to changes in biomass. The focused nature of the fishery at South ... Paper Title:  Analysis of haul data from the South Georgia krill fishery Abstract / Description ... 1994 and 1996 were examined and a range of descriptive measurements reflecting the fishery operation ... were produced. The measurements emphasise that the krill fishery at South Georgia was geographically ... that are sensitive to changes in biomass. The focused nature of the fishery at South Georgia suggests ... fishery at South Georgia, building upon an earlier spatial analysis of the fishery undertaken by Murphy ... at South Georgia occurs during the austral winter and spans the end of one CCAMLR reporting year ... have been used throughout this paper: shoot time: the time at the start of shooting the net for ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 9–30 : Autor(es): Trathan, P.N., I. Everson, E.J. Murphy and G.B. Parkes

7. Estimating the impact of depredation by killer whales and sperm whales on longline fishing for toothfish (Dissostichus eleginoides) around South Georgia

   data collected on longliners between 2003 and 2009 were analysed to look at the levels of depredation ... whales occur during May at the start of the season with the sightings becoming fewer towards the end of ... Paper Title:  Estimating the impact of depredation by killer whales and sperm whales on longline ... . Since 2003, cetaceans have been observed on 22% of 14 300 observed lines, with killer whales present on ... longliners between 2003 and 2009 were analysed to look at the levels of depredation caused by killer whales ... %. 165 Impact of cetaceans on D. eleginoides fisheries at South Georgia Since 2002, anecdotal ... seasonal and spatial patterns to the behaviour of cetaceans at South Georgia. The highest rate of sperm ... proportion of sightings of each species in each area, assuming the split between east and west at 39°W ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 163–178 : Autor(es): Moir Clark, J. and D.J. Agnew

8. Options for allocating the precautionary catch limit of krill among small-scale management units in the Scotia Sea

   Paper Title:  Options for allocating the precautionary catch limit of krill among small-scale ... management units in the Scotia Sea Abstract / Description:  Following an assessment of Antarctic krill ... (Euphausia superba) in the Scotia Sea, CCAMLR established a precautionary catch limit of 4 million tonnes and ... catch limit for krill among the SSMUs so as to preclude the inadvertent concentration of catches in a ... that krill catches be reported at a scale of 10 by 10 n mile squares by 10-day periods at the end of ... season availability of krill (e.g. arrival weights, egg mass, natality rate, foraging trip duration ... ). Consumption estimates for penguins at the South Orkney Islands were determined from abundances of breeding ... functions (Figure 2) similar to those described for combined indices of predator performance at South ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 81–97 : Autor(es): Hewitt, R.P., G. Watters, P.N. Trathan, J.P. Croxall, M.E. Goebel, D. Ramm, K. Reid, W.Z. Trivelpiece and J.L. Watkins

9. Selectivity of commercial and research trawls in relation to krill

   trawl catches krill length composition hardly varied at all. Statistical analysis of catches showed that ... Paper Title:  Selectivity of commercial and research trawls in relation to krill Abstract ... / Description:  This paper describes the results of fishing a single krill aggregation with a commercial trawl ... more large krill (35-58 mm) than catches of the research trawl (30-54 mm). The maximum difference in ... catches krill length composition hardly varied at all. Statistical analysis of catches showed that when ... catching zone of the IKMT begins immediately at the trawl mouth. The trawl opening (7 m2) is maintained ... equipment as a field of swarms. At night krill were concentrated in the upper depth layer of 0 to 40 m ... distributions in catches made by the two types of trawl was estimated at a probability P(A) = 0.95 ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 161–169 : Autor(es): Kasatkina, S.M

10. A risk-management framework for avoiding significant adverse impacts of bottom fishing gear on Vulnerable Marine Ecosystems

    operates should be related to the scale of VMEs, presently unknown. However, management at the level of ... Paper Title:  A risk-management framework for avoiding significant adverse impacts of bottom ... measure in 2007 to ensure that significant adverse impacts of bottom fishing gear on Vulnerable Marine ... Ecosystems (VMEs) are avoided. Due to the high levels of uncertainty surrounding both the evidence of VME ... be related to the scale of VMEs, presently unknown. However, management at the level of fine-scale ... were in force at that time (CCAMLR, 2006, paragraph 11.38). In 2007, noting the requirements of UNGA ... so na r V er y hi gh R eq ui re s va lid at io n of ac ou st ic s ig na tu re ... of a ss oc ia ti on * Sp ec ie s as so ci at io ns w it h co ld - w at er c ...

    Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 177–193 : Autor(es): Martin-Smith, K

Páginas