WAMI-01/04
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The fishery for Champsocephalus gunnari and its biology at Heard Island (Division 58.5.2)
R. Williams, E. van Wijk, A. Constable and T. Lamb (Australia)
Resumen:
Commercial trawl fisheries in the modern era started within the Heard Island EEZ in 1997. This paper summarises the fishing activities to date and collates the information on the biology of the species gathered from the fishery and from a series of fishery-independent surveys conducted between 1990 and 2000. Icefish abundance varies widely between years and the fishery is dependent on Read More
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Admin Admin (Secretaría de la CCRVMA)
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WAMI-01/06
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Some thoughts of mackerel icefish distribution in connection with krill distribution
S.M. Kasatkina, Zh.A. Frolkina, A.P. Malyshko and V.A. Senioukov (Russia
Resumen:
The paper contains comparative analysis of mackerel icefish and krill vertical and horizontal distribution based on acoustic measurements and results of bottom and pelagic trawling sampling. Significance of studying the krill and mackerel icefish interaction for understanding the regularity of mackerel icefish distribution is shown.
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WAMI-01/01
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Provisional Annotated Agenda for the CCAMLR Workshop on Approaches to the Management of Icefish
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WAMI-01/09
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Proposals for improvement of census surveys for mackerel icefish quantitative assessment – design of acoustic trawling survey in Subarea 48.3
S.M. Kasatkina, Zh.A. Frolkina and P.S. Gasyukov (Russia)
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WAMI-01/08
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Possible causes of variation of Champsocephalus gunnari vertical and horizontal distribution
Zh.A. Frolkina and S.M. Kasatkina (Russia)
Resumen:
C.gunnari form no aggregations during wintering period and inhabit places that are inaccessible for fishing. Conduction of census surveys during this period is pointless. In spring, during feeding period, they form aggregations near bottom thus being available for harvesting just at the beginning of this period (September). Data on stock assessment collected during accounting survey are good Read More
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WAMI-010/7
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On assessment of instantaneous natural mortality rate of mackerel icefish (Champsocephalus gunnari) from South Georgia subarea
Zh.A. Frolkina, R.S. Dorovskikh (Russia)
Resumen:
The applicability of various methods to assess icefish natural mortality is analysed. On the basis of the conclusions made the parameters of Bertalanffy’s growth equation and natural mortality rate are estimated.
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WAMI-01/11
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Occurrence by-catch juvenile Champsocephalus gunnari under krill fishing in Subarea 48.2 in May to July 1999
V.A. Bibik and L.K. Pshenichnov (Ukraine)
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WAMI-01/10 Rev. 1
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Notes on Champsocephalus gunnari biology, availability, diet and spatial distribution in the South Shetland and South Orkney Islands (Subareas 48.1 and 48.2)
C.D. Jones and J. Emery (USA)
Resumen:
Stocks of the mackerel icefish Champsocephalus gunnari in the Southern Scotia arc region of the Southern Ocean (CCAMLR Subarea 48.1 & 48.2) have several different biological characteristics than stocks in the Northern Scotia Arc. The history of commercial C. gunnari exploitation in the Southern Scotia Arc was short lived and intense, and led to the collapse of the stocks. Stocks in this Read More
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WAMI-01/02
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List of participants
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WAMI-01/03
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List of documents
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WAMI-01/15 Rev. 1
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Icefish fishery information
Secretariat
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WAMI-01/12
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Estimation of relative fishing power of vessels carried out bottom trawl survey off South Georgia
P.S. Gasyukov (Russia)
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WAMI-01/16
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Distribution of mackerel icefish by size-group at South Georgia
A.W. North and I. Everson (United Kingdom)
Resumen:
The depth distribution of C. gunnari was investigated with data from 9 groundfish surveys between 1986 and 2000 using data from representative, randomly located hauls. The data set for South Georgia (Subarea 48.3) but excluding Shag Rocks comprised between 58 and 61 bottom trawls in each of 8 depth strata with mean depths of 112, 137, 165, 185, 208, 230, 257 and 308 m. Fish were divided into Read More
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WAMI-01/13
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Biological reference points for C. gunnari based on the stock assessment with integrated statistic methods (XSA)
P.S. Gasyukov and R.S. Dorovskikh (Russia)
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WAMI-01/14
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Assessments of mackerel icefish
I. Everson (United Kingdom), S. Kasatkina (Russia), C. Goss and M. Belchier (United Kingdom)
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WAMI-01/05
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Acoustic assessment of potential bias in abundance estimates of mackerel icefish from trawl surveys
E. van Wijk, T. Pauly, A. Constable and R. Williams (Australia)
Resumen:
In 2000, CCAMLR asked the Working Group on Fish Stock Assessment (WG-FSA), whether trawl surveys are the most reliable and appropriate method to survey stocks of mackerel icefish (Champsocephalus gunnari). Recent acoustic data from the South Atlantic suggested that mackerel icefish may not always be distributed closely on the sea floor during the day as conventional wisdom would have it, but Read More
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