WG-FSA-88

Finfish have been harvested in the Atlantic sector of the Southern Ocean since the end of the 1960s by the Soviet Union mainly. Notothenia rossii marmorata was the target species in the first peak years 1969-71 which yielded about 500,000 tonnes in 2 seasons. Since 1975/76 fishing is mostly directed to the icefish Champsocephalus gunnari and to a lesser extent Patagonotothen brevicauda Read More
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Age determination was carried out on Notothenia gibberifrons specimens collected at two localities of the South Shetland Islands (Low I. and Potter Cove, 25 De Mayo I./King George). Samples were composed by small and medium size fishes (14.8-38 cm of total length). Otolith and scale readings have been compared in 19 Potter specimens. In some of them scale readings resulted one year greater. Read More
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Age was determined on the basis of growth microincrements in otoltihs. A calibration subsample of 49 specimens (total length range: 3.9 - 59.0 cm) was aged using optical sagittal and transverse otolith sections and/or acetate replicas. Age ranged from 138 to 2116 days. A multiple regression was applied to find a model for the age estimation from measurable fish and otolith parameters. The Read More
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A total of 40 bottom trawl hauls was carried out fromboard RV "Polarstern" in October and December 1987. Preliminary results indicate a rather stable stock compositions in Chaenocephalus aceratus, Notothenia gibberifrons and N. neglecta at least since February 1985. In N. rossii the proportion of larger (= older) fish in the catches increased. Composition of the catches of C. gunnari differed Read More
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Data on age composition of catches and fishing efforts for 1979/80 - 1987/88 were used to analyse N. guntheri stock status. On the basis of these data using VPA method with different adjustments stock estimates were obtained. Instantaneous natural mortality coefficient was M = 0.7 - 0.9 (Atlantic Fisheries Research Institute data). To estimate terminal value of instantaneous fishing Read More
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