Résultats de la recherche
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Investigation of potential biases in the assessment of Antarctic toothfish in the Ross Sea fishery using outputs from a spatially explicit operating model
. Conceptually this assumption implies either that tagged and untagged fish mix equally in the population, or ... that fishing effort for recaptures is distributed in proportion to the underlying abundance. Neither of ... these conditions are likely to occur in practice, and violation of this assumption may lead to bias. In ... this paper we investigate such potential biases in the assessment of Antarctic toothfish in the Ross ...
Meeting Document : WG-SAM-13/36 : Auteur(s): S. Mormede and A. Dunn (New Zealand)
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Report on fishing effort and seabird interactions during the season extension trials in the longline fishery for Patagonian toothfish (Dissostichus eleginoides) in Statistical Division 58.5.2
management of fisheries in CCAMLR (see e.g. Conservation Measure CM 25-02 and 41-08). Longline fishing in the ... fishery for Patagonian toothfish (Dissostichus eleginoides) in Statistical Division 58.5.2 started as a ... seabird mitigation measures since the initial fishing season in 2003. Over the years, CCAMLR has agreed to ... add season extensions from 15-30 April and 15 September- 31 October to the core season. In 2015 ...
Meeting Document : WG-FSA-2019/31 : Auteur(s): P. Ziegler, T. Lamb, S. Wotherspoon and J. Dell
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Course of fisheries in the Lena Bank area (Division 58.4.4) in the season of 1990-91
Abstract: In the season of 1990/1991, fishing operations in subarea 58.4.4. (Lena Bank) wer4e ... carried out by only one vessel- RTMA ZVEZDA KRYMA in April-June 1991. The total harvest in that period ... eleginoides. The real catch excels the data in the Statistical Bulletin… nearly two-fold. In this connection ... significant changes. The mean fish age made 7.0 years. Interannual fluctuations in size-age composition of ...
Meeting Document : WG-FSA-94/07 : Auteur(s): A.K. Zaitsev (Ukraine)
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By-catch of juvenile Antarctic fish from krill (Euphausia superba Dana) fisheries in the South Georgia area, in 1992
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 ... % when only tows made in shelf waters were considered. Juvenile fish abundance, normalised to 1 t of ...
Meeting Document : WG-FSA-93/8 Rev. 1 : Auteur(s): E.A. Pakhomov and S.A. Pankratov (Ukraine)
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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
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 ... year classes entered the cove. In comparison, Notothenia neglecta, a non commercially fished species ...
Meeting Document : WG-FSA-93/13 : Auteur(s): E.R. Marschoff and E.R. Barrera-Oro (Argentina)
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Plan of research program of the Ukraine in Subarea 48.2 in 2016 (second season)
research activities on the assessment of the stock state of the Dissostichus spp species in subarea 48.2 ... will be carried out within three years. Implementation of the tagging program in the long-term ... prospective will provide the indicators for the procedure of abundance assessment of the studied species in ... year 2016 we propose to remain the majority of surveys in the Northern Block as were conducted in year ...
Meeting Document : WG-FSA-15/45 : Auteur(s): Delegation of Ukraine
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An examination of latitudinal variation in the growth rates of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea
collected between 67 and 74° S, an investigation to test for latitudinal differences in growth rates was ... conducted. Length-at-age of Dissostichus mawsoni was compared across five zones in a 15.5° latitudinal range ... (62.5°–78.0° S). Between-zone comparisons were confounded by marked differences in the age structure of ... in the length-at-age data. There is no statistically significant difference in mean growth rates of D ...
Meeting Document : WG-FSA-03/30 : Auteur(s): P.L. Horn (New Zealand)
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CPUEs and body length of Antarctic krill within commercial hauls of polish trawler FV Lepus in the fishing ground off South Orkneys in January and February 1991
Abstract: Length composition of krill in diurnal and night hauls of FV Lepus, off S. Orkneys in ... in night hauls was slightly higher than within diurnal hauls. CPUE values in February were higher ... than those in January. No larval fish were recorded in krill catches. Only few specimens of Electrona ... antarctica (of length range 53- 103 mm) were found in some night hauls. Author(s): I. Wójcik and R ...
Meeting Document : WG-KRILL-91/37 : Auteur(s): I. Wójcik and R. Zaporowski (Poland)
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Using outputs from spatial population models of Antarctic toothfish in the Ross Sea region to investigate potential biases in the single population model
Abstract: We present a method to evaluate potential biases and uncertainty in the tagging ... assumptions of the stock assessment for Antarctic toothfish in the Ross Sea region using spatially explicit ... operating models. The method allows investigation of potential biases and uncertainty in the assumptions of ... spatial distribution and fish mixing used in the standard stock assessments for the Ross Sea region (and ...
Meeting Document : WG-FSA-12/45 : Auteur(s): S. Mormede and A. Dunn (New Zealand)
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Revised reproductive analysis of Dissostichus mawsoni in SSRU 58.4.1 C for the Korean exploratory longline fishery in 2012/2013
Abstract: In the Division 58.4.1 there are two stocks of Dissostichus mawsoni, which is ... vulnerable with a big range of about 1,000-2,000 t per SSRU in 58.4.1. However, there is not enough data to ... analyze the reproductive ecology of Dissostichus mawsoni in SSRU 58.4.1C based on the histological methods ... as a part of Korean research plan for Dissostichus spp. in SSRUs 58.4.1 C and E during 2012/2013 ...
Meeting Document : WG-FSA-13/45 : Auteur(s): I.J. Yeon, J.S. Lee, Y.J. Kwon, M.A. Jeon, S.K, Choi, K.J. Seok, D.W. Lee, K.Y. Ku and H.J. Kim (Republic of Korea)