Search results
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Distribution characteristics of krill aggregations in the fishing ground off Coronation Island in the 1989/90 season
not have echo-integrating equipment, a fact which severely limited the amount of hydroacoustic ... are given in Table 1. CPUE (Catch-per-unit-effort) was assessed as catch per hour of trawling because ... catch per hour of trawling, Q/hr, (Ivanova, 1988; Smith, 1980) was calculated in the following manner ... : 51 iii(Q/hr) = n I,Q i=1 n I,Ttp,i i=1 where QI = catch in haul i; T tp.1 = duration ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 49–73 : Author(s): Kasatkina, S.M. and V.I. Latogursky
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Trends in relative abundance of fjord Notothenia rossii, Gobionotothen gibberifrons and Notothenia coriiceps at Potter Cove, South Shetland Islands, after commercial fishing in the area
. Still evident is the decline in trammel-net catches of fjord-dwelling Notothenia rossii ... reported for the period 1983-1990. A trend of increasing N. rossii catches was observed, but the levels ... evident is the decline in trammel-net catches of fjord-dwelling Notothenia rossii and Gobionotothen ... for the period 1983-1990. A trend of increasing N. rossii catches was observed, but the levels of relative ... by banning directed fisheries and establishing stringent by-catch limits. Commercial fishing in the South ... Island, in the austral summer of 1995/96. Still evident is the decline in trammel-net catches of fjord ... N . rossii catches was observed, but the levels of relative abundance of this species and G. gibberifvons ... on the northern coasts of the northernmost island, Elephant Island, from 1978 to 1980, but catches from other ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 43–52 : Author(s): Barrera-Oro, E.R., E.R. Marschoff and R.J. Casaux
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Geographical differences in the condition, reproductive development, sex ratio and length distribution of Antarctic toothfish (Dissostichus mawsoni) from the Ross Sea, Antarctica (CCAMLR Subarea 88.1)
3 shows the catch-weighted length- frequency distribution separated into the northern and southern areas ... 2% of the numbers in each annual sample. Table 4 shows the overall ratio of females to the total catch-weighted ... 60.7% of the catch-weighted sample over five seasons (standard deviation 1.4%). Figure 4 shows ... limited data col- lected during April and May of the 2000/01 and 2001/02 seasons. Fish condition ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 27–45 : Author(s): Fenaughty, J.M
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Assessments of the stocks of Notothenia rossii marmorata and Champsocephalus gunnari in the South Georgia area
most attention is usually paid to the catch at age data input into a VPA, it is important ... (equivalent to the terminal fishing mortality rate, when the catches are known) and the net recruitment ... rate to the stock in each year implied by the age data. The catch at age data themselves do ... where C is the catch in numbers. t To convert the stock and catch by number to the stock and catch ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 1-21 : Author(s): Cooke, J.G.
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Factors that may influence the accuracy of abundance estimates from CCAMLR tag-recapture programs for Dissostichus spp. and best practice for addressing bias
, and the consequent risk of overfishing, is a higher priority issue than maximising the catch during the development ... Selection of fish that are not representative of the catch (e.g. size of fish) M̂ M> N̂ N> Low Medium ... Release tagged fish that are representative of the catch Size-specific M̂ Release rate of tagged ... N> High High Tag fish in proportion to the catch, spread tags across the experimental area Use ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 63–72 : Author(s): Welsford, D.C. and P.E. Ziegler
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Mitigation of seabird captures during hauling in CCAMLR longline fisheries
setting has reduced the total number of dead seabirds in by-catch from over 5 000 in 1997 to near-zero ... in reducing the number of seabirds killed during line setting has highlighted the remaining by-catch problem ... , seabird by-catch, haul mitigation, bird exclusion device, CCAMLR 157 Mitigation of seabird captures ... the hauling bay. CCAMLR noted that seabird by-catch around the haul was a potential problem, particularly ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 155–162 : Author(s): Reid, E., B. Sullivan and J. Clark
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Telemetry monitoring of ecological resources
of telemetry and location monitoring are discussed. Limitations on weight, communication range and service life ... are indicated. A general description of attachment methods and their limitations is given. Three automatic ... Current status of telemetry and location monitoring are discussed. Limitations on weight ... and their limitations is given. Three automatic tracking system options are described. Several data recording methods ... are discussed. Limitations on weight, communication range and service life are indicated. A general description ... of attachment methods and their limitations is given. Three automatic tracking system options are described ... l'objet d'une discussion. Les limitations concernant le poids, la portee de la communication et la ... . procuring or developing adequate sensors is the major limitation in making long-term measurements under ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 495-511 : Author(s): Kuechle, V.B.
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Analysis of results from demersal fish surveys at South Georgia, undertaken by the United Kingdom and the USSR, January and February 1990
interspersed with a few large catches. The small number of large catches cause a disproportionate increase ... characterized by large numbers of small hauls interspersed with a few large catches. The small number of large ... catches cause a disproportionate increase in the estimated standing stock of Champsocephalus gunnari ... interspersed with a few large catches. The small number of large catches cause a disproportionate increase ... . These data included station lists and positions, catch and sample data. No age data were available because ... daylight although, when time became short, some were made after dark. Catches were sorted into species ... on board immediately following the haul. In the case of small catches, all the catch had been sorted ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 223–254 : Author(s): (Report of a Joint UK/USSR Workshop, 23 to 27 July 1990)
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Movement, growth and available abundance to the fishery of Dissostichus eleginoides Smitt, 1898 at Heard Island, derived from tagging experiments
process. Fish for tagging were randomly selected after the catch was dumped into the pounds from ... the waterline of the vessel. Generally, hauls with a fairly small catch (2 tonnes or less) were used ... distribution of tagged fi sh was similar to that of the commercial catch. Recaptures were monitored ... in the population should equal the proportion of recaptured fi sh in the catch. Applying Williams et al. 38 ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 33–48 : Author(s): Williams, R., G.N. Tuck, A.J. Constable and T. Lamb
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Attribtuion of acoustic echoes to squid in the south Atlantic
intensas registradas en la columna de agua recorrida por la red. El arrastre se limit6 a un estrato de ... avgentinus and Loligo gahi), but a third species, sometimes caught as a by-catch with Illex argent inus ... in the CCAMLR area is based only on data from catches of small numbers of individuals (Rodhouse et al., 1996 ... in a pelagic net. The pelagic trawl, towed at between three and four knots, was designed for catching small ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 259–271 : Author(s): Goss, C., P. Rodhouse, J.L. Watkins and A.S. Brierley