Sukmiwati, Mery2013-05-312013-05-312013-05-31978-602-17943-2-6wahyu sari yenihttp://repository.unri.ac.id:80/handle/123456789/3524The aim of this research is to investigate natural food composition of various sea cucumber. Samples were collected in the coastal waters of Natuna, Riau Islands In June 2009. Samples were taken from 2 location: Sepempang and Pengadah beach. The analysis methods use is identification of phytoplankton, frequency of presence phytoplankton and percentage volume of phytoplankton. Of ten species found 19 genus and detritus, include two families : Chrysophyta and Chyanophyta. The highest frequency of percentage volume of food is 13,5% by cymbrella from Sepempang beach and 13,6% by Cymbella from Pengadah beach.enfrequency of presence phytoplanktonidentification of phytoplanktonpercentage volume of phytoplanktonsea cucumberNatunaOther