Research concept on catchability to study toothfish abundance/stocks in the Antarctic marine areas

Main two methods, which are used for the estimation of abundance/stocks of toothfish in the Antarctic marine areas, are the method based on tag recaptures and the method grounding on the CPUE data. But calculation of toothfish abundance with using these methods demands a number of assumptions, which sometimes broaden too much the possible values of the calculated parameters. The authors present a method approach concerning possible use of a bottom trawl survey to estimate a minimum guaranteed toothfish abundance value on a designated marine area. This provide a valuable reference data, which can be used to assess a direct indicative catchability of longlines.