Documents

Document Number	Title	Agenda Item(s)
More Info	WG-FSA-93 - Meeting Report Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document	1
WG-FSA-93/01 More Info	Provisional agenda and annotation to the provisional agenda for the 1993 meeting of the Working Group on Fish Stock Assessment (WG-FSA) Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/02 More Info	List of participants Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/03 More Info	List of documents Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/04 More Info	Report of the Workshop on the Management of the Antarctic Crab Fishery (La Jolla, California, USA, 26 to 28 April 1993) Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/05 More Info	Analyses performed at the 1992 meeting of the Working Group on Fish Stock Assessment D.J. Agnew (Secretariat) Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/07 More Info	A method for preparing large numbers of otolith sections for viewing by scanning electron microscope J.R. Ashford, K. Robinson and M.G. White (United Kingdom) Abstract: In an investigation of the age structure of a population of Notothenia coriiceps Richardson at the South Orkney Islands, Antarctica, the microstructure of otoliths was examined. Progress is reported on a method used for processing large numbers of otoliths using a scanning electron microscope (SEM). Compared with previous SEM techniques, which normally prepare otoliths individually for viewing Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/09 More Info	Aspects of the distribution and interannual variations in larval fish assemblages at South Georgia, Antarctica M.G. White (United Kingdom) Abstract: The Antarctic fish fauna is relatively impoverished with fewer than 300 species recorded from the whole Southern Ocean. Demersal forms predominate but many of these have extended early life histories as pelagic larval and juvenile phases. Only 30 larval stages of the 103 fish species occurring at South Georgia have been identified but these represent all of the dominant and economically Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/10 More Info	A suggested bottom trawling survey on the Ob and Lena Banks W. Moderhak (Poland) Abstract: The paper presents calculations of water flow velocity through the codend under the assumption that the flow is uniform and equal on its entire surface. The calculations were made for different ratios of cod end length to its diameter, mesh bar length to mesh bar diameter, and for various mesh opening coefficients. The results obtained were analysed with regard to the impact of flow velocity Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/12 Rev. 1 More Info	Submission of plans for conducting finfish surveys in the Convention Area Secretariat Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/13 More Info	Size variations associated with abundance changes in juvenile Notothenia rossii, observed at Potter Cove, South Shetland Islands, since the end of the fishery in the area E.R. Marschoff and E.R. Barrera-Oro (Argentina) Abstract: Samples of fish collected from 1983 to 1992 at Potter Cove, King George Island, South Shetland Islands, are used to study the decline in abundance previously reported fro fjord Notothenia rossii, in association with changes in the size and age structure of the juvenile population. Mean lengths increased in correlation with poor recruitment to inshore waters and sharply decreased as stronger Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/14 More Info	The early life history and the onset of scale formation in the Patagonian toothfish, Dissostichus eleginoides Smitt, 1898 K.-H. Kock (Germany) Abstract: Patagonian toothfish, Dissostichus eleginoides, spawn in July to September. Hatching is likely to occur in October/November. Scales do not start to form before the fish are 64-74 mm long. It is far from being resolved when the first 'winter ring' is formed. Available information suggests that the annulus may not be completed before spring. Length composition of fish <40 cm exhibited Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/15 More Info	The Dissostichus eleginoides fishery in Division 58.5.1 (Kerguelen Islands) G. Duhamel (France) Abstract: The Kerguelen fishery (trawlers and long-liners) of Dissostichus eleginoides is analyzed in the ligth of the knowledge of life cycle of the species. Catches reach a similar cumulative value that in South Georgia subarea (48-3). Fishing grounds and fishing methods have been separated and the tendancies from the LFD and an index of abundance compared. Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/16 More Info	The Patagonian toothfish (Dissostichus eleginoides) fishery on the Kerguelen Island shelf V.G. Prutko (Ukraine) Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/17 More Info	On the status of mesopelagic fish (myctophidae) in the Southern Ocean ecosystem A.N. Kozlov (Russia) Abstract: Analysis and synthesis of results of Russian and foreign research into the trophic relationships of myctophids demonstrate that this group of mesopelagic fish plays a significant role in the community of marine organisms of the Southern Ocean. The trophic status of myctophids has been determined - they are zooplankton-eaters who consume a considerable amount of meso and macroplankton which Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/18 More Info	The migration patterns of Electrona carlsbergi (Tåning, 1932) A.N. Kozlov (Russia) Abstract: On the basis of analyses and review of published data on the biology and distribution of Electrona carlsbergi, as well as on the hydrological patterns of the Southern Ocean - especially concerning the structure and spatial variation of the Antarctic Circumpolar Current (ACC) - this paper describes possible ways and means (mechanisms) by which this species carries out meridional migration in Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/19 More Info	Estimates of seabed areas within selected depth ranges E.N. Sabourenkov, A. Blake and D.J. Agnew (Secretariat) Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/20 More Info	Estimating confidence intervals for fish stock abundance estimates from trawl surveys W.K. de la Mare (Australia) Abstract: A method is developed for calculating asymptotic confidence intervals for trawl surveys using the swept area method, using likelihood ratios from Aitchison's delta distribution. Simulation tests of the method show that unbiassed estimates of the density and biomass can be obtained and that the estimated confidence intervals have close to the nominal coverage probability. Performance Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/21 More Info	Stock state of Dissostichus eleginoides at Subarea 48.3 and adjacent zones C.A. Moreno and P.S. Rubilar (Chile) Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/22 More Info	Proposal for an experimental crab fishery in Subarea 48.3 George Watters (USA) Abstract: An experimental management strategy is proposed for the Paralomis spinosissima fishery around South Georgia. The strategy is designed to answer specific, a priori questions about the population dynamics of P. spinosissima, and consists of three phases to be conducted over a period of two years/fishing seasons. Phase 1 occurs at the start of the first fishing season and is a "survey" regime Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/23 More Info	Using production models to assess the stock of Paralomis spinosissima around South Georgia Island George Watters (USA) Abstract: Four production models were fit to a time series of daily catch per unit effort (CPUE) data from the 1991/92 fishery for Paralomis spinosissima around South Georgia Island. The four models considered recruitment in different ways. Model 1 contained a linear recruitment function; Model 2 had constant recruitment; Model 3 contained a Beverton-Holt recruitment function, and Model 4 used a Ricker Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/24 More Info	Variations in the diet composition and feeding intensity of mackerel icefish (Champsocephalus gunnari) at South Georgia (Antarctic) K.-H. Kock and S. Wilhelms (Germany), I. Everson (United Kingdom) and J. Gröger (Germany) Abstract: The diet composition and feeding intensity of mackerel icefish ( Champsocephalus gunnari) around Shag Rocks and the mainland of South Georgia was analyzed from c. 8,700 stomachs collected in January/February 1985, January/February 1991 and January 1992. Main prey items were krill (Euphausia superba), the hyperiid Themisto gaudichaudii, mysids (primarily Antarctomysis maxima) and in 1985 also Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/25 More Info	On the taxonomy of the Lepidonotothen squamifrons group (Pisces, Perciformes, Notothenioidei) R. Schneppenheim and K.-H. Kock (Germany), G. Duhamel (France) and G. Janssen (Germany) Abstract: The Lepidonotothen squamifrons group has been described to be comprised of 3 species: L squamifrons (Günther, 1880). L kempi (Norman, 1937) and L macrophthalma (Norman, 1937). All 3 species closely resemble each other and morphological and meristic characters utilized to distinguish between species are overlapping. Enzyme electrophoresis of enzyme polymorph isms has been applied to specimens Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/26 More Info	Timescale of ovarian maturation in Notothenia coriiceps (Richardson); evidence for a prolonged adolescent phase Inigo Everson (United Kingdom) Abstract: Ovarian maturation in Notothenia coriiceps is known to include a period during which yolk deposition begins to take place. This 'adolescent' phase was thought originally to last for about one year. The results from a two year study at Signy Island indicate that this adolescent phase lasts for about four years. There is also some evidence to indicate that not all sexually mature fish spawn each Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/27 More Info	Distribution of catches of Dissostichus eleginoides in Subareas 48.3 and 48.4, 1992/93 season Secretariat Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/28 More Info	UK scientific research cruise for finfish: Subarea 48.3 Delegation of UK Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/29 More Info	Revision of the commercial catch at age of the Antarctic icefish Champsocephalus gunnari over the period 1976/77 to 1990/91 G.B. Parkes (United Kingdom) Abstract: A revision of the calculation of total international catch at age of Champsocephalus gunnari over the period 1976/77 to 1990/91 is presented. This uses iterative application of two age length keys to obtain age distributions, according to a method described by Kimura and Chikuni (1987). It is proposed that the revised catch at age be used for future assessment of the C. gunnari fishery at Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/6 Rev. 1 More Info	Cross-sectional structure and validation of the timing of annulus formation in otoliths of the Antarctic fish Notothenia coriiceps Richardson (Nototheniidae) J.R. Ashford and M.G. White (United Kingdom) Abstract: To validate the timing of annuli in otoliths of immature Notothenia coriiceps Richardson. a time-series of samples were taken over a complete year. Light and scanning electron microscopy (SEM) techniques were used to examine the structure of sectioned otoliths. Six growth regions were identified in the otolith sections and micro-increments were also evident. The timing of growth and annual Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document
WG-FSA-93/8 Rev. 1 More Info	By-catch of juvenile Antarctic fish from krill (Euphausia superba Dana) fisheries in the South Georgia area, in 1992 E.A. Pakhomov and S.A. Pankratov (Ukraine) Abstract: Discussed in this paper is an investigation on juvenile antarctic fish caught during krill fishing by the BAT GrigOly Kovtun in the region of the South Georgia Islands during the period May-June 1992. Two species were predominant in the by-catches: Champsocephalus gunnari and Nototheniops larseni. The frequency of occurrence of juvenile fish was 18.2% when considering all krill tows and 45 Read More Submitted By: Admin Admin (CCAMLR Secretariat) Request Meeting Document

Meetings

WG-FSA-93

Agenda