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    Preliminary assessment of mackerel icefish (Champsocephalus gunnari) in Subarea 48.3 based on a UK survey in January 2004

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    R.C. Wakeford, D.J. Agnew, M.B. Collins and G.B. Parkes(United Kingdom)
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    A preliminary assessment of mackerel icefish, Champsocephalus gunnari, was undertaken for South Georgia (Subarea 48.3) using the standard CCAMLR methodology. This was based on the results of a UK bottom trawl survey during January 2004. Using CCAMLR decision rules, an estimate of the one-sided 95% confidence bound for the total biomass for 2003/04 was obtained using the bootstrap method for age 2+ fish only (age 1+ were not available from UK acoustic data in 2004). Estimates of short-term yield estimated within the GYM for 2004/05 and 2005/06 were 4,270 tonnes and 2,357 tonnes respectively.