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Size at sexual maturity of Patagonian toothfish (Dissostichus eleginoides)
Paper Title: Size at sexual maturity of Patagonian toothfish (Dissostichus eleginoides) Abstract ... / Description: Analyses of size at sexual maturity were undertaken on samples of Patagonian toothfish ... that L m50 occurs at 78.5 cm total length for male and 98.2 cm for female fish. In 1997 the results for ... proportion, 25 to 43%, of sexually mature fish were not coming into spawning condition. This introduces a ... Survey High Cross, Madingley Road Cambridge CB3 OET, United Kingdom Abstract Analyses of size at ... eggs and mature at about half their maximum length (Kock and Everson, 1998). The process of yolk ... reproductive cycle. This was highlighted at the 1997 meeting of the CCAMLR Working Group on Fish Stock ... (asymptote = 1). The length at which 50% of the population were mature (L,,,) was determined from the ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 37–46 : Autor(es): Everson, I. and A.W. Murray
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Joinville–D’Urville Islands (Subarea 48.1) – a former fishing ground for the spiny icefish (Chaenodraco wilsoni), at the tip of the Antarctic Peninsula – revisited
icefish (Chaenodraco wilsoni), at the tip of the Antarctic Peninsula – revisited Abstract / Description ... Expedition ANT XIX/3 by RV Polarstern in February 2002. Five hauls were conducted north of the two islands at ... primarily fish 25–35 cm long. The fish fauna at the tip of the Antarctic Peninsula represents a combination ... : The former fishing ground off Joinville–D’Urville Islands was revisited in the course of the Antarctic ... GROUND FOR THE SPINY ICEFISH (CHAENODRACO WILSONI), AT THE TIP OF THE ANTARCTIC PENINSULA – REVISITED ... Polarstern in February 2002. Five hauls were conducted north of the two islands at depths of 149 to 282 m on ... fi sh 25–35 cm long. The fi sh fauna at the tip of the Antarctic Peninsula represents a combination ... much more sparse. This is particularly true of the fi shing ground off Joinville–D’Urville Islands at ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 1–20 : Autor(es): Kock, K.-H., L. Pshenichnov, C.D. Jones, K. Shust, K.E. Skora and Zh.A. Frolkina
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A first attempt at an assessment of the Patagonian toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands EEZ
Paper Title: A first attempt at an assessment of the Patagonian toothfish (Dissostichus ... a robust indication that the spawning biomass has been depleted to, at most, a few percent only of ... eleginoides) resource in the Prince Edward Islands EEZ Abstract / Description: The history of the fishery for ... -per-unit-effort (CPUE) trend. Application of a simple age-structured production model (ASPM) provides ... , Vol. 9 (2002): 11–32 11 A FIRST ATTEMPT AT AN ASSESSMENT OF THE PATAGONIAN TOOTHFISH (DISSOSTICHUS ... indication that the spawning biomass has been depleted to, at most, a few percent only of its pre ... -effort (CPUE). This paper presents a fi rst attempt at a quan- titative assessment of the resource, by ... the fi shery. The use of a deterministic model assumes that the resource was at its average pre ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 11–32 : Autor(es): Brandão, A., D.S. Butterworth, B.P. Watkins and D.G.M. Miller
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Catch-at-age analysis applied to new fisheries: the case of Dissostichus eleginoides
Paper Title: Catch-at-age analysis applied to new fisheries: the case of Dissostichus eleginoides ... Abstract / Description: Traditionally, the approach used in the assessment of new fisheries has been based ... on research surveys, making it possible to estimate the standing stock and potential yield of a ... resource by coarse methods. The main aim of such surveys is to monitor fishing operations in order to ... evaluation methods based on catch composition data. This paper explores the application of catch-at-age ... -at-age model proposed below relates to this last type of fishery. 2. EVALUATION MODEL The basic ... assumptions of the catch-at-age model are as follows: • the stock of D. eZeginoides belongs to a closed ... = numbers at the beginning of the research survey J.1i = exploitation rate F i = fishing mortality r i ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 3–9 : Autor(es): Zuleta, A.V. and C.A. Moreno
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Movement, growth and available abundance to the fishery of Dissostichus eleginoides Smitt, 1898 at Heard Island, derived from tagging experiments
Smitt, 1898 at Heard Island, derived from tagging experiments Abstract / Description: tocks of ... Paper Title: Movement, growth and available abundance to the fishery of Dissostichus eleginoides ... Patagonian toothfish (Dissostichus eleginoides) in different sectors of the Southern Ocean are considered to ... separate between shelves and banks separated by deep water. More particularly, the separation of stocks on ... was at the upper end of the size range normally found on the grounds. These four long-range movers ... and from the Kerguelen Plateau by extensive stretches of water deeper than 2 000 m. At present, fi ... of times with values for growth, mortality and abundance drawn at random from suitable statistical ... structure of the GYM and the parameters used in the modelling of the toothfi sh stock at HIMI are detailed ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 33–48 : Autor(es): Williams, R., G.N. Tuck, A.J. Constable and T. Lamb
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Analysis of results from demersal fish surveys at South Georgia, undertaken by the United Kingdom and the USSR, January and February 1990
Paper Title: Analysis of results from demersal fish surveys at South Georgia, undertaken by the ... discussions and analyses of the data from a survey from MV Hill Cove in January 1990 and RV Akademik Knipovich ... in February 1990 around South Georgia. Both surveys were characterized by large numbers of small ... hauls interspersed with a few large catches. The small number of large catches cause a disproportionate ... Knipovich had only returned to Sevastopol at the end of May 1990 and this had left little time in which to ... Details of the trawl net used for the survey were not available at the workshop. These were to be ... series. All hauls were intended to last for 30 minutes at a speed of 3 to 3.5 knots. Hauls were ... . Detailed information will be presented at the 1991 meeting of the CCAMLR Working Group on Fish Stock ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 223–254 : Autor(es): (Report of a Joint UK/USSR Workshop, 23 to 27 July 1990)
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A composite recruitment index to describe interannual changes in the population structure of Antarctic krill at South Georgia
structure of Antarctic krill at South Georgia Abstract / Description: A composite recruitment index based ... and length data are derived from standard station net hauls only. Comparison of these indices showed ... substantial differences, due in part to bias arising from a large number of krill in just one of the station ... net hauls. Therefore, when the number of station net hauls is limited, bias is likely to be reduced if ... RECRUITMENT INDEX TO DESCRIBE INTERANNUAL CHANGES IN THE POPULATION STRUCTURE OF ANTARCTIC KRILL AT SOUTH ... population structure have been obtained from krill eaten by predators at the western end of South Georgia ... Programme has carried out systematic net hauls at up to eight stations within each of two boxes on the ... survey boxes is shown at the top left. The bathymetric contour represents 1 000 m. Table 1: Number of ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 71–84 : Autor(es): Watkins, J.L
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Beached marine debris surveys and incidences of seabird/marine mammal entanglements and hydrocarbon soiling at Bird Island and King Edward Point, South Georgia, and Signy Island, South Orkneys, 2009/10
(entanglements and hydrocarbon soiling only). Surveys of beached marine debris at Bird Island recorded a total of ... 2010) respectively. Surveys at Signy Island recorded a total of 41 items during summer 2009/10 ... varying quantities) at Bird Island, and the majority of items collected at Signy Island were either ... plastic or wood. Entanglements of 7 Antarctic fur seals (4 involving green nylon string) were observed at ...
Meeting Document : SC-CAMLR-XXIX/BG/10 : Autor(es): Delegation of the United Kingdom
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Entanglement of Antarctic fur seals Arctocephalus gazella in man made debris at Signy Island, South Orkney Islands 1999/2000
Abstract: The results of the fourth annual survey of entanglement of Antarctic fur seals at Signy ... juvenile males, the main component of the population at this time of year.The number of sightings was the ... the number of fur seals arriving at Signy Island in 1999/2000 was the highest observed since ... being caused to 60% of animals at Signy Island, which was the lowest on record. As usual this was higher ...
Meeting Document : SC-CAMLR-XIX/BG/03 : Autor(es): Delegation of the United Kingdom
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Decrease in numbers of the eastern rockhopper penguins Eudyptes chrysocome filholi at Marion Island, 1994/95 to 2002/03
Abstract: Numbers of rockhopper penguins Eudyptes chrysocome breeding at Marion Island decreased ... adults, and there was a decrease in the mass at arrival at breeding colonies of both males and females ... . Except in 1997/98, the mass of chicks at fledging was less than that recorded at two other localities ... . These factors suggest an inadequate supply of food for rockhopper penguins at Marion Island. Decreases ...
Meeting Document : WG-EMM-03/10 : Autor(es): R.J.M. Crawford, J. Cooper, B.M. Dyer, M.D. Greyling, N.T.W. Klages, D.C. Nel, J.L. Nel, S.L. Petersen and A.C. Wolfaardt (South Africa)