Japan has deployed one scientific observer on a Japanese krill trawler, Chiyo Maru No. 5, from 4 August 2003 to 21 September 2003. The observation was essentially undertaken following the CCAMLR Scientific Observers Manual. Summary of the fishing efforts, processing, fish by-catches, biological measurements of krill, product types, vessel and marine mammal observations are described in the report. The trawler made remain trips the west and north areas of South Georgia Island during observation.