WG-FSA-99

1. Bottom trawl surveys on the South Georgia shelf indicate episodic declines in the abundance of the mackerel icefish Champsocephalus gunnari that, since 1990, are not directly attributable to commercial fishing.
2. The greatest effect has been observed in years when krill are known to have been scarce on the South Georgia shelf.
3. It is thought that C. gunnari survivorship is Read More
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It has been suggested a method of GY-model adjustment to the additional data of observations represented as abundance indices. Catch per effort values or results of inventory surveys can serve as such indices. Adjustment basic concept is a selection of those GY-models from realization sets a certain function of which runs through the set of points defined by confidence intervals of abundance Read More
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Giant petrels (Macronectes spp) are the most sexually dimorphic of all seabirds. We used satellite-tracking and mass change during incubation to investigate the influence of sexual size dimorphism, in terms of the intersexual food competition hypothesis, on foraging and fasting strategies of northern giant petrels at South Georgia. Females foraged at sea whereas males foraged mainly on the Read More
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Longline fishing for Patagonian toothfish Dissostichus eleginoides in the South African Exclusive Economic Zone around the Prince Edward Islands commenced in 1996. This paper summarises seabird bycatch during the year July 1998-June 1999. Data on seabird bycatch were obtained from fishery observers aboard all 11 sanctioned fishing trips, representing a fishing effort of 5.1 million hooks. This Read More
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Based on a survey of Dissostichus eleginoides in the Heard Island region in April 1999 and information from an observer program on the commercial fishery begun in 1997, this paper aims (i) to provide an assessment of biomass and stock structure in the vicinity of Heard, (ii) to examine the relationship between commercial fishing grounds and the wider plateau and banks where surveys have been Read More
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A revised bathymetric map of the South Orkney Islands (Subarea 48.2) was generated using several integrated bathymetric databases and newly available acoustic seafloor data. The region extends from 60.2ºS-62.2ºS latitude and 42.5º-47.5º longitude. From the integrated data sets, areas of seabed within the 500 m isobath were computed for 50 m depth intervals. Areas were calculated based on Read More
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In response to concern about rajid bycatch in CCAMLR finfish fisheries, we conducted a preliminary analysis of data collected by UK scientific observers on vessels fishing toothfish in Subarea 48.3 from April to July 1999. The overall average catch rate of rays was 0.7/thousand hooks, compared with 34.7/thousand hooks for toothfish and 2.2/thousand hooks for grenadier species. Generalised Read More
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We develop a new approach to quantifying habitat use within the foraging ranges of satellite-tracked seabirds. We applied kernel estimation techniques to 167 days (3738 locations) of data from black-browed and grey-headed albatrosses (Diomedea melanophris and D. chrysostoma) during the chick rearing period of the breeding cycle at South Georgia. At this time the activity range of these two Read More
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The need to protect young fish and spawning aggregations in fisheries generally, and specifically in the C. gunnari fishery in Subarea 48.3, is reviewed. Mechanisms available to achieve these objectives are discussed, including the measures put in place by CCAMLR to date. These measures are re-examined in the light of new information, and a strategy for the future protection of young fish and Read More
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We used data collected by CCAMLR International Scientific Observers in 1997 and 1998 to examine potential relationships between seabird incidental mortality rates on longline vessels fishing for Dissostichus eleginoides and various factors, including the nature and use of mitigating measures as well as environmental variables such as time of day, time of year.
Out of 3283 longline sets Read More
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The results of experiments on the South Georgia Shelf carried out in the period of 1986 to 1990 have been presented. Six (6) daily stations were occupied where vertical distribution of fry and young individuals (including adult specimens) of Champsocephalus gunnari, Champsocephalus aceratus, Pseudochaenichthys georgianus (Channichthiidae family) and Nototheniops larseni (Nototheniidae family) Read More
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In February-March 1999, a Russian fishing vessel "Zakhar Sorokin" carried out fishery for Champsocephalus gunnari in CCAMLR subarea 48.3. During the processing of catches taken in the area of the northwestern slope, two species of parasites were revealed: copepod Eubrachiella antarctica and leech Trulliobdella capitis Brinkman, 1948. Statistical data collected during examination of more than 3 Read More
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The recent history of global initiatives to reduce seabird by-catch in longline fisheries are reviewed, highlighting in turn the activities of environmental and industry non-governmental organizations (NGOs), national governments and inter-governmental bodies. At least 40 species of seabirds, especially albatrosses and petrels, are affected, with unsustainable mortality rates in a number Read More
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In 1998, an offshore scientific trawl survey of bottom fish sampling within the 50-500 m isobath of the lower South Shetlands Islands (King George Island to Low Island) was conducted. In addition, the abundance of two commercially important Antarctic fish, Notothenia rossii and Gobionotothen gibberifrons has been monitored relative to another potentially exploitable fish, Notothenia coriiceps Read More
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A monitoring program of demersal fish in inshore sites of the South Shetland Islands has continued in Potter Cove from 1991 to 1999, covering a continuous sampling period of sixteen years and in Harmony Cove, Nelson Island, in the austral summer 1995/96. The decline in trammel net catches of fjord fishes of the species Notothenia rossii and Gobionotothen gibberifrons in relation to the non Read More
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We tracked by satellite the foraging trips of males and females of the two sibling species of giant petrels, Macronectes halli and M.giganteus, breeding sympatrically at Bird Island (South Georgia, Antarctica), during the incubation period (November-December). Size of the activity range as well as speed and distance covered on foraging trips were similar between species but lower for males Read More
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The foraging range and principal feeding areas of White-chinned Petrels breeding at South Georgia were determined using satellite telemetry. Foraging trips during incubation lasted 12-15 days and covered 3,000-8,000 km and 2-11 days and 1,100-5,900 km during chick-rearing. Adults covered less distance per day during chick-rearing (71 km) than during incubation (91 km) but the proportion Read More
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Grey-headed mollymawks Thalassarche chrysostoma are killed by longline fishing operations in the southern Indian Ocean. We studied the foraging ecology of breeding grey-headed mollymawks at Marion Island, by tracking their foraging trips and sampling their diets. During the incubation period, birds made longer foraging trips, mostly towards the subtropical convergence and Subantarctic zone. Read More
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From 16 Fenruary to 10 March, 1999, a Russian large capacity trawler "Zakhar Sorokin" carried out fishery for icefish Gunnari in CCAMLR subarea 48.3. During the cruise, 88 hauls were done and 264,921 t of icefish were caught. 86% of catch were taken from 28 February to 3 March on the nothwestern slope of the South Georgia Island, where icefish fed actively on Antarctic krill and, therefore, Read More
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The factors affecting the number and the mortality of seabirds attending long-liners and trawlers fishing in the Kerguelen area were studied during four successive seasons (1994-1997), based on observations carried out onboard by dedicated observers. Twenty-four species of seabirds were observed attending fishing vessels representing 591 birds / census. The total numbers attending varied Read More
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The effect of an intensive sampling programme on an inshore population of Notothenia coriiceps was studied at Potter Cove, South Shetland Islands, by comparing catch data taken in successive summers of 1992/93 to 1994/95 at one specific zone (site 1) with those taken in the same last summer at two close but not previously sampled zones (sites 2 and 3). The fish were caught with trammel nets Read More
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The results of icefish ecology were summarized for the period of above 20 years of South Georgia Subarea study. Ecological aspects were considered taking into account temporal-spatial variability. The functional structure of Ch.gunnari distribution area was described on the basis of juvenile fish distribution at different stages of physiological state. Juvenile fish mainly distribute in the Read More
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Stocks of finfish around the South Orkney Islands (Subarea 48.2) suffered substantial declines during the period the fishery was open from split year 1977/78 through 1989/90. Scientific bottom trawl surveys of finfish biomass within the 500 m isobath of the South Orkney Islands have been conducted by the Federal Republic of Germany in 1985, Spain in 1991, and the United States in 1999. Read More
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Commercial exploitation of finfish in the southern Scotia Arc took place from 1977/78 to 1989/90, with its heydays from 1977/78 to 1981/82. Except for Elephant Island, the state of fish stocks of the southern Scotia Arc region has found little attention until 1998 despite substantial catches in the first four years of the fishery and the possibility to sample these catches extensively. Read More
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New Zealand conducted Longline weighting trials during the 1998/99 fishery for Dissostichus spp. in Sub-area 88.1. Daylight setting was allowed south of 65°S in Sub-area 88.1 under special provisions in Conservation Measure 169/XVII. The provisions included strictly applied line-weighting regimes and rigorous monitoring of line sink rates.
In the trials, two autoline vessels set weighted Read More
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This paper assesses the status and abundance of M. carinatus on BANZARE Bank (Statistical Division 58.4.3/1). The long-term precautionary yield was estimated using the Generalised Yield Model (GYM) used previously by the CCAMLR Working Group on Fish Stock Assessment. Estimates of population and biological parameters were not available for this species at BANZARE Bank. Length and weight data Read More
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To examine consistency between laboratories in age estimation of Patagonian toothfish, otoliths were taken from 100 fish caught in the South Atlantic, and transverse sections prepared by baking, then grinding from the anterior and posterior sides of the otolith. Ages were estimated from the otoliths by one reader from the Center for Quantitative Fisheries Ecology at Old Dominion University and Read More
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