CCAMLR

Finfish stocks in the Antarctic Peninsula region (CCAMLR Statistical Subarea 48.1) have been exploited from 1978179 to 1988189 with most of the commercial harvesting taking place in the first two years of the fishery. Results of bottom trawl surveys conducted by Germany in the vicinity of Elephant Island in the 1980s showed that stocks of Champsocephalus gunnari, Notothenia rossii, Gobionotothen gibberifrons, Chaenocephalus aceratus have been considerably affected by fishing. Stocks of G. gibberifrons and C. aceratus had apparently recovered to a large extent by the second half of the 1980s. C. gunnari remained at a low level. The status of N. rossii is still unclear, although some recovery was apparent from length compositions obtained in the 1980s. The Antarctic Peninsula region was closed for finfishing from 1989190 onwards. Results of the first bottom trawl survey carried out after the closure of the area in November-December 1996 suggested that the fish standing stock biomass had further declined. Given the low abundance of C. gunnari and other species and the difficulties in managing fisheries which exploit mixed-species assemblages there appears to be little prospect at present in re-opening the fishery around Elephant Island.

The incidental mortality of birds in the fishery of Dissostichus eleginoides was analyzed for the Chilean fleet at Subarea 48.3 during 1996 to 1997. In 1996, 533 birds were killed and 478 in 1997. The most vulnerable species was Diomedea melanophrys representing 41,% of the total bird killed in both years, followed by Procellaria aequincotialis with 10% and 33% respectively. For 1995, 1996 and 1997 the BPUE (Birds killed per 1000 set hooks) was calculated, existing no significantly differences among fishing seasons.

Data on incidental mortality of seabirds and marine mammals associated with longline fishing around the Falkland Islands between August 1996 and May 1997 are briefly summarised. For seabirds, the overall average rate of incidental mortality was 0.34 birds per 1000 hooks; excluding a single set when 87 birds were caught, the average was 0.05 birds per 1000 hooks. Black-browed albatrosses comprised 90% of birds caught.

According to the results of the long-term studies (1967–1991) in expeditions to the sub-Antarctic and Antarctic waters of the Indian Sector of the Southern Ocean, distribution areas of the Patagonian and Antarctic toothfish are clearly cut. It was concluded that the areas of these toothfish species were not overlapped in the area under review.

Available in YugNIRO data concerning distribution of Antarctic toothfish juveniles in the Indian Sector of the Antarctic are used in the paper. In the summer period of the southern hemisphere (January–March) juveniles of D. mawsoni with size from 4–9 to 30–75 cm were regularly registered in catches of bottom and pelagic midwater trawls in all the studied continental seas from 12 to 144°E.