Synopsis (short abstract)Neritic tu species in the Andaman Sea Coast, Thailand comprise 7 species (Thunnus tonggol, Euthynnus affinis, Auxis thazard, A. rochie, Katsuwonus pelamis and Sarda orientalis, Scomberomorus spp.). These species were caught from purse seine, king mackerel gill net and trawl, while purse seine was the main fishing gear. The trend of neritic tu catches have been decreasing from 45,083 tons in 1997 to 13,093 tons in 1999. The production was quite stable around 10,711 and increase to 11,861 in 2009. These neritic tu species are more or less have its production trend similarity. Three Thai tu longliners were operated in the Indian Ocean in 2007 and in 2008- 2012 only two Thai tu longliners kept on fishing there. Fishing grounds were mainly in the western coast of Indian Ocean. The fishing operations were recorded 2,276 fishing days. The highest total catch was in 2010 with 607.69 tonnes followed by 2012, 2007, 2011, 2009 and 2008, respectively (494.95,461.64, 370.39, 295.23 and 265.57 tonne s). The highest CPUE was found in 2010 with 13.62 fish/1,000 hooks followed by 2012 and 2007, respectively (10.80 and 10.20 fish/1,000 hooks). The major catch species wer bigeye tu (Thunnus obesus) , yellowfin tu (T. albacores) Albacore tu (T. alalunga),swordfish and shark.