Study on detection and movement of pelagic fish school using hidroacoustic method in Bangka strait has been done in two steps. The first step acoustic and oceanography survey which have been done in July 1901 – 2401 2008. The second step was data processing which have been done in August 2008 - January 2009 at Research Center for Capture Fisheries, Ministry of Marine Affairs and Fisheries, Ja…