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Revision of icefish (С.gunnari) stock estimate in South Georgia Area was caused by elaboration of the following methodical aspects of trawl-acoustic survey: the processing method improvement for target strength estimates using in situ measurement data; the combination of trawl and acoustic surveys results for icefish biomass estimates .
We discus these methodical aspects and present the new icefish target strength estimated obtained from in situ measurement data by bootstrap-method and biomass estimates and its statistical characteristics. Major sources of uncertainties in icefish stock estimates and some ways of improvement of icefish stock estimates are shown too.