SC-CAMLR-VI

This is available in published form as SC-CAMLR-VI (1987)

Aspects of the reproductive performance of Black-browed, Grey-headed and Wandering Albatrossess, Gentoo and Macaroni Penguins and Antarctic Fur Seals, recorded annually at Bird Island, South Georgia over the last decade (and similar data for Adelie and Chinstrap Penguins at Signy Island, South Orkney Islands) are summarised and reviewed. Breeding success of the Wandering Albatross, which Read More
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A survey of Antarctic fur seals in the South Shetland Islands, Antarctica, during the 1986/87 austral summer indicated that this species is continuing its population recovery and recolonization of rookery sites following 19th Century commercial exploitation. Twelve fur seal pupping sites were identified, some of which had not previously been reported. The largest pupping sites are at Telmo Read More
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Surveys of the South Shetland Islands, Antarctica in 1987 provided data on the size and location of penguin and Antarctic Blue-eyed Shag colonies and the breeding status of other seabirds. Our estimate of 1,618,370 to 2,084.570 breeding Chinstrap Penguins, the most abundant penguin in the study area. is two to three times the previous estimate. Other seabird species were also found to be more Read More
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Five species of Antarctic euphausiid crustaceans were studied from the Antarctic Peninsula and the southeastern Weddell Sea.
Life spans range from two years for Euphausia frigida to six years for the krill Euphausia superba. Growth in length and weight was calculated by non-linear regressions. No difference in growth of krill were observed between the Antarctic Peninsula area and the Read More
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Japanese krill fishing operation was observed on board a commercial vessel and actual operation was described in detail. Fish finder was most useful in detecting swarms while sonar was used to judge the towing direction. Size of fished swarms ranged from 100 m to 10 km with different distribution in different fishing areas. While catch per towing time reflects within-swarm density catch per Read More
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A model is set up for the operation (which includes both searching and fishing) of a Japanese krill trawler over a half-month period, and the output is compared to statistics from a sample of data from the commercial fishery. Twenty-four candidate "CPUE" biomass indices are considered, and their performance investigated in response to six different ways in which the overall krill biomass in a Read More
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Simple relationships expressing dependence of sampling relative error in biomass estimate (by means of a survey) on statistical characteristics of fish concentration density field under examination and on parameters of survey itself, have been derived with the help of mathematical statistics and methods of calculus of probabilities; biomass estimate is determined as a product of average Read More
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The swept area method was used to estimate biomass density changes in the stocks of five fish species Champsocephalus gunnari, Chaenocephalus aceratus, Pseudochaenichthys georgianus, Notothenia gibberifrons, and Notothenia rossii marmorata in the South Georgia area in the seasons of 1976/77-1986/87. In most of the seasons analysed, the estimates covered a near-bottom layer in about 1/6 of the Read More
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Foremost in the elucidation of accurate population dynamics parameters in fish is a necessity for an errorless estimation of age. Age determination can provide basic life history information, including mortality, population age structure, and changes in individual growth. Most investigations have used annual rhythmic deposition in calcified tissues as time marks but, due ts the lack of Read More
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Hydroacoustic and net sampling data were used to determine the distribution and abundance of krill. In an attempt to address the effect that variability in sampling gear type may have on specific population parameters (e.g. size frequency, abundance and distribution), a multi-year comparison of these types of samp1ing gear commonly used in the Antarctic has been initiated.

A method is proposed for estimating the biomass of swarms of Euphausia superba by catching cast off exoskeletons in quantitative net tows.

The ages of 252 mature female krill, collected from Prydz Bay in January 1985, were determined using length frequency analysis and the fluorescent age pigment (FAP) technique. Results of both methods indicate 6 year classes for adult krill. Correspondence between the ages determined by the two techniques is generally within one year.
The animals were also analyzed by a computerized image Read More
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