WG-FSA-96

The results obtained during juvenile surveys in Subarea 48.3 are presented. In the period from 1984 to 1990 AtlantNIRO carried out 6 surveys of that type. 40 fish species from 15 families were found in the juvenile trawl catches. Data are given on young icefishes distribution, length composition, vertical diurnal migrations and young Champsocephalus gunnari by-catches in krill fishery.

Experimental acoustic survey in shelf areas off South Georgia and Shag Rocks in CCAMLR Subarea 48.3 aimed at demersal fishes abundance and distribution assessment is described. Data on trawl stations location, catch length compostion, per cent proportion of various fish species in trawls samples, data of biological and oceanologica3 researches are presented. The data on target strengths Read More
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Data on 6 juvenile fish surveys within South Georgia Subarea have been analysed in the paper. There has been revealed that the most abundant species in the catches by juvenile fish trawl were Champsocephalus gunnari and Lepidonotothen larseni and those the most varions were the representatives or Nototheniidse family (10 species), Myctophidae family (7 species) and Bathydraconidae family (5 Read More
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A randomised cluster design was used successfully to sample otoliths from targetted individuals taken by individual longlines in the fishery for Dissostichus eleginoides. The line was divided into constituent baskets of line; we used the line as the sampling frame, and baskets as the primary sampling units. The design allows representative samples to be taken while a line is being hauled; it Read More
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A shore-based design used to sample sports fisheries was adapted to sample otoliths from targetted individuals caught in the artisanal longline fishery for Dissostichus eleginoides off northern Chile. Observers were stationed dockside and at a processing factory. A 14-day sampling frame was used, divided into primary sampling units of days/area and secondary sampling units of three- and eight- Read More
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The examination of the sexual ratio of D. eleginoides between the first week of March and the third week of July 1996, in the subarea 48.3 shows that the sex ratio departs from the expected 1:l ratio being the females more abundant in the longline samples, except during May, when the males at size of first maturity join the female population. After the first week of June, the sex ratio turns Read More
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This note describes a successful method for tagging Dissostichus eleginoides and presents an analysis of a tag-recapture experiment carried during the Macquarie Island fishery for this species during the 1995-96 season. Simple population and tag accumulation models are used to account for the tags being released at various times throughout the season, and the effects of the removals by fishing Read More
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Estimates of absolute numbers of recruits to the stock of patagonian toothfish around the Heard Island region are calculated from density at length data derived from stratified trawl surveys. The estimates are referred to the four year-old age class. The parameters for a lognormal recruitment distribution suitable for use in a population model are calculated.

An experimental longline fishing cruise targetting D. eleginoides has been realised in the deep-sea zone (300 - 1700 m) off the Kerguelen islands (Division 58-5-1) from February to April 1996. The by-catch has been identified with 10 species of fish reaching a important part (36,1%) of the total catch in number. The grenadier Macrourus carinatus and two species of skates Bathyraja eatonii and Read More
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A number of weighted smoothing splines were fit to data on carapace length and size-specific, median chela height of Paralomis formosa. The second derivative of the spline which made the best tradeoff between goodness of fit and smoothness was used as an estimate morphometric size at maturity. Bootstrapping techniques provided a bias-corrected estimate of morphometric size at maturity (sBc) Read More
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Data collected from the FN American Champion during Phases 1 and 2 of the experimental crab fishery were analyzed with generalized additive models and depletion estimators. Results from the generalized additive models show that the density of fishable P. spinosissima is highest off the northern coast of South Georgia and at depths between about 100 and 300 fathoms. The Phase 1 results suggest Read More
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Estimates of the number of seabirds taken incidentally in longline fisheries on Patagonian toothfish (Dissostichus eleginoides) are still based on limited information. We report here on observations on the by-catch of seabirds during a cruise of the Chilean longliner 'Puerto Ballena' in Statistical Subarea 48.3. A total of 118 dead black-browed albatrosses, 3 dead grey-headed albatrosses, 46 Read More
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Results of the analysis of three consecutive cruises to subarea 48.3 are analyzed. A significant variance component associated with the formation of clusters of stations was found as well as a general trend for increasing densities since 1994. The significant variance component obtained for clusters formed with stations at 8.0 nautical miles implies that considering all stations as independent Read More
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A diet analysis of the patagonian toothfish Diissostichus eleginoides in the Subarea 48.3 in March/April 1996 was carried out by frequency of occurrence (F%) and coefficient "Q" (%) methods. The samples consisted chiefly of immature specimens, with predominant length ranges of 30-70 cm (TL). Fish was by far the main food at SR and SG (63 % as sole prey). Krill appeared as secondary food, Read More
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The diet composition of the icefish Champsocephalus gumari caught in the Subarea 48.3 in March/April 1996 was analyzed using Frequency of occurrence (F%) and coefficient "Q" (%) methods. Krill was by far the main food around South Georgia and Shag Rocks (F= 85%, Q= 99%). Other prey items, known as an important alternative food in years of krill scarcity, were ingested only occasionally ( Read More
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The mackerel icefish (Champsocephalus gunnari) is a prominent member of the coastal fish fauna of the Seasonal Pack-ice Zone and the islands north of it. Separated into a number of stocks, its distribution ranges from the Scotia Arc region, namely South Georgia, in the Atlantic Ocean sector to the Kerguelen-Heard Plateau in the Indian Ocean sector. Mackerel icefish have been heavily exploited Read More
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Scientific observation under the auspices of the CCAMLR Scheme of International Scientific Observatio was conducted onboard the Chilean longliner 'Puerto Ballena' fishing for Patagonian toothfish (Dissostichus eleginoides) in Subarea 48.3 from March to May 1996. Details of the cruise are provided. Biological investigations incorporated length, sex, maturity and weight measurements of D. Read More
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In anticipation of the development of a new fishery for the oceanic squid Martialia hyadesi in the Scotia Sea a revision is presented of annual consumption of the species by higher predators and a brief review is provided of information about the life cycle and distribution obtained from research fishing and commercial catches. The species is consumed by seabirds, seals and whales and the most Read More
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Observations on abundance of by-catch fishes were made during fishing operations for krill Euphausia superba Dana conducted by the Ukrainian trawler Grigory Kovtun in the vicinity of South Georgia (May to July, 1992), the Polish trawler Lepus on the fishing grounds of South Orkney Islands and South Georgia (March to May, 1993), and by the Japanese fishing vessels No.3 and No.5 Chiyo Maru in Read More
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One of the non-solved problems in krill exploitation has been the by-catch of fish larvae that use (or co-occurred) the krill swarms as their habitat. The detection of this problem started together with the massive antarctic krill exploitation during the 80's. There has been recognized several fish species whose larvae develop within the krill swarms, nevertheless, few have been the Read More
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For recent years Dissostichus eleginoids is the main target species of trawling and long-line fisheries in the vicinity of the Kerguelen Islands. Results of research made by the author on board the fishing vessel "Poltava" in the summer season 1991-1992 were the base for the present paper. Regular direct distribution of size groups D. eleginoides in depth range within the fishing area on the Read More
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The cephalopods of the Antarctic are supposed to have a very high biomass level However, they have not been fished nor any fishable aggregations of them detected to date in the CCAMLR Convention Area. The squid Moroteuthis ingens has been constantly present in bottom trawl catches on Ob Bank during aimed fishery for Lepidonotothen squamifrons. At maximum, the proportion of squid in the total Read More
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Four species of shark have been known to date to occur in the sub-Antarctic waters: Lamna nasus, Somniosus microcephalus, Etmopterus lucifer, E. granulosus. A specimen of Squalus acanthias was captured in February 1995 on the shelf of the Kerguelen Islands from the depth of about 195 m and duly described . Squalus acanthias is believed to be one of the most widespread shark species in the Read More
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AS many as 18 species of benthopelagic fishes belonging to 12 families were caught in trawls during the integrated surveys in December 1977 and in January 1978 on Elan Bank consisting of two sublatitudinal sea-bottom elevations with prevailing depths from 960 to 1350 m. Among these fishes there were found both species inhabiting exclusively in sub-Antarctic and Antarctic waters (endemies) and Read More
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Interactions between longliners, fishing for Patagonian toothfish Dissostichus eleginoides in the west of Kerguelen islands during 1995 - 96 cruise, and marine mammals occured with Kerguelen Fur Seals Arctocephalus gazella. They catch 0.75 % of toothfish on long-lines where interaction occured, but 2.2 % were lost alongside the vessel.

By-catch was observed during two successive cruises of longliners fishing for Patagonian toothfish Dissostichus eleginoides in approximately 500m depth along the shelf slope in the west of Kerguelen. By-catch consisted mainly of Rajidae Bathyraja spp. (85 %). The proportion of species taken in the by-catch was low (less than 0.75%) and does not represent a problem at the present level of Read More
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Incidental captures of seabirds were observed during 93/94 to 95/96 longlining fishing campaigns around Kerguelen islands (division 58.5.1). Mean by-catch rate is 0.81 birds / 1.000 hooks. The species mainly affected is the White-chinned Petrel Procellaria aequinoctialis (86 %), because of its diving faculty. The different ways to minimize seabird by-catch proposed by CCAMLR are tested and Read More
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Studies carried out over the past three decades at Crozet and Kerguelen Islands in the Indian Ocean indicate that wandering albatross Diomedea exulans populations declined markedly, but since 1986 have shown slow recovery. The population of the endangered Amsterdam albatross Diomedea amsterdamensis appears to have similarly recovered since 1985, but remains close to extinction. A demographic Read More
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Sea-birds taking baits during longline setting occationally become caught and are killed, while the associated bait loss may have serious impact on longlining efficiency and profitability. Two different setting methods were tested as a solution to this problem; lines were set either through a setting funnel that guided the baited line beneath the sea surface or when using a sea-bird scaring Read More
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