SC-CAMLR-VIII

The results of investigations are presented on selective properties of experimental trawls with a square- and diamond-shaped mesh, on the traumatic rate of krill passed through a mesh and remained in the trawl,on the survival rate. When trawls with a square-shaped mesh were used the highest screening rate was observed in the cod end instead of the belly,the selective properties of the Read More
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The paper contains a description of the statistical method used for assessment of the fishing intensity based on actual fishing effort and estimating the initial krill biomass prior to beginning of the fishery. Application of the statistical method for assessment of the initial krill biomass may be realistic provided that the conditions exist, which permit to determine the catchability of the Read More
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STATLANT data reported to the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) are used to discern visible trends in catch and effort for the Antarctic krill (Euphausia superba) fishery between 1972/73 and 1987/88. With time the annual krill catch rose gradually to a peak of some 500 000t in 1981/82 before droping to a low level in 1983/84 and stabilising at about Read More
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This research examines the energy budget of breeding female Antarctic fur seals, both when food was plentiful and when it was scarce. The energy expenditure and change in body mass of lactating female Antarctic fur seals, Arctocephalus gazella, foraging at sea was measured in two years using doubly labeled water at South Georgia Island. There was no difference between years in mass gain, water Read More
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Available information on key reproductive parameters of Champsocephalus gunnari has been reviewed and discussed in the light of existing conservation measures. Length at first spawning is c. 25 cm around South Georgia and Kerguelen Islands, but c. 35 cm around the South Orkney Islands and in the South Shetland Islands/Antarctic Peninsula region. Around South Georgia spawning takes place from Read More
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An operational management procedure for krill in sub-Areas 48.1 + 48.2 + 4 48.3 requires a basis for the assessment of resource status, and an algorithm for specifying the levels of regulatory mechanisms (e.g. a catch control law) that depends on the results of the assessment. Developing and selecting a procedure requires a basis for the simulation testing of procedures, and an operational Read More
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Finfish have been harvested in the Atlantic sector of the Southern Ocean since the end of the 1960s mainly by the Soviet Union. Notothenia rossii marmorata ,vas the target species in the first peak years 1969-71 which yielded about 500,000 tonnes in 2 seasons around South Georgia. Since 1975/76 fishing has been mostly directed to the icefish Champsocephalus gunnari. and to a lesser extent Read More
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Areal cover is calculated for the Statistical Sub-areas (48.1, 48.2 and 48.3) from which the bulk of the commercial krill catch has been taken. Correspondingly, the areas of the following four regions are also calculated - (a) the CCAMLR Convention Area, (b) south of 55°S, (c) containing krill concentrations and (d) south of the mean summer position of the 0°C isotherm using specialised Read More
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Analysis of original and literature data for the past 10 years pertaining to the region -of the Antarctic Penunsula and adjacent waters points to a relationship between the distribution of krill and the waters of two major circulation systems - those of the Weddell Sea and the Bellingshausen Sea inhabited by separate subpopulations of the species. The latter are predominant in the region while Read More
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Though South Georgia and Bouvet Island are located at the same latitude, the growth and maturation rates as well as the average minimal sizes of E.superba are appreciably higher in the former than in the latter area. This is attributed to milder climatic conditions and better food supply in the South Georgia area as compared to Bouvet Island. The differences in the growth and maturation rates Read More
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The paper considers peculiarities of krill fishery conducted by a krill fishering and processing vessel producting krill meat. The vessel operated in the Commonwealth Sea, the Cosmonaut Sea and in twi Scotia Sea areas (off South Orkneys and off South Georgia) from February to June 1988. In all four areas the average catch per hour was maintained at the same level of 5-8 t to permit full Read More
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The paper considers the determination of time of breeding of five species of Antarctic Euphausiids. The original and literature data on age composition of larvae gave the possibility to calculate the dates of the beginning, termination and periods of high and the most intension of spawning. In the waters of different origin and on different latitudes euphausiids begin to spawn in a usual Read More
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Las capturas medias por lance de pez hielo (Champsocephalus gunnari Lonnberg, 1905) y de (Notothenia gibberifrons Lonnberg,1905) obtenidas en la sub6rea 48.3 (Georgia del Sur) durante la campafia "ANTARTIDA 86111', han sido comparadas con las alcanzadas en otras prospecciones y en la pesca comercial.

Se ha observado que el arte semipelágico utilizado en la campaña "ANTARTIDA 8611" ha Read More
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Durante la campaña “ANTARTIDA 86ll”, se efectuaron 29 operaciones de pesca alrededor de Shag Rocks en las que se capturaron cerca de diez toneladas de Patagonotothen brevicauda guntheri. En base a los análisis cuantitativos y caulitativos de cada una de estas pescas, se han obtenido datos puntuales en el tiempo y en el espacio acerca de la distribución horizontal y batimétrica de esta especie Read More
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An estimate of target strength of Antarctic krill, Euphausia superba was obtained by a series of cooperative experiments between research vessel and commercial krill trawler. Estimated target strength per 1g wet weight of Antarctic krill was -66.ldB a t the frequency of 200kHz. Average size of krill was 47.48mm and 0.873g.

The distribution of krill (Euphausia superba) concentrations derived from Japanese krill fishing and minke whaling (Balaenoptera acutorostrata) data was investigated in relation to bottom topography, sea-ice and hydrographic features. Data were from the Indian, Pacific and western Atlantic sectors. In early summer (December) the areas of operation for both fisheries were affected by the Read More
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The selection of a survey area of sufficient size to acount for the migratory behavior of krill and based on evaluating the variance structure of sampling within the area from a time-series of data from 1981, 1984 and 1978-1989 permitted resolution of inter-year differences in standing stock. The two units of sub-area within the site exhibit different patterns of annual distribution, but the Read More
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The hydroacoustic survey found a high krill abundance in the Elephant Island area (a “superswarm" not unlike 1981) and a very low abundance in the King George Island area compared to last years survey. The total biomass in the vicinity of Elephant Island estimated from 200 kHz survey data was 940 k tons with only 34 k tons in the King George Island/Bransfield Strait. The survey results apply Read More
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Field research activities conducted aboard the NOAA Ship Surveyor during the 1989 austral summer in waters adjacent to the Antarctic Peninsula and South Georgia are described. Operations included 1) ice seal studies in Gerlache Strait, 2) ichthyoplankton survey around South Georgia, 3) benthic survey for fish and invertebrates around South Georgia, 4) measurements of air and surface water C02 Read More
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Larval fishes were obtained from 0-50 m bongo net and stratified 0-200 m Nansen net samples collected in the western Bransfield Strait region during four RACER program cruises, December, 1986, through March, 1987. Three nototheniid species, Nototheniops larseni, Notothenia gibberifrons, and Trematomus scotti, numerically dominated the total catch. Two typically abundant species in this area, Read More
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The effects of a number of harvesting strategies on the Antarctic icefish Champsocephalus gunnari have been simulated for a period of 30 years.
These were
- diffierent levels of constant fishing mortality (F0.1, Fmax, 2xFmax),
- harvesting contantly at 50%F0.1 with an increase of F 3 or 6 years after a good recruitment,
- pulse fishing at an interval of 3 years with no fishing Read More
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Satellite imagery of the pack ice edge position in western part of the Atlantic sector of the Antarctic derived on each tenday period basis has been used to analyse its spatial and temporal variation in the area between 65° and 20°W. Amplitude of the seasonal variation of the ice edge position was found to increase from the west to the east. Described is two-year cyclicity of consecutive Read More
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Between September 1987 and February 1988, Antarctic fur seals Arctocephalus gazella at Heard Island fed mainly on fish with an average 95.2% of scats in monthly collections containing fish remains. Pelagic myctophids constituted more than 50% of fish taken by fur seals at the beginning of the summer season and again at the end when there was an influx of non-breeding male seals. During the Read More
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