Survey of fatty acid composition in brown ( Cystoseira myrica) and red (Laurencia snyderiae ) macro algae in intertidal zone in Bushehr province

Sea cucumber is one of the echinoderms belonging to the branch of ( Echinodermata) and from the class of ( Holothuroidea) that has appeared during the evolutionary period, 540 million years ago in the oceans. At this time 1400 species of sea cucumber have been identified and reported in the seas of the whole world Sea cucumbers have many important and useful properties known for human health. Although sea cucumber is commercially important, its biology, ecology and dynamic of population have not been known yet.With this respect and the lack of scientific knowledge about them, this study has been conducted in order to identify the species present in the Larak Island in the Persian Gulf .two species of sea cucumber (two family, two species belong to genus Holothuria and another one species of Stichopus ) were collected on sub tidal zone of the Larak Island (Persian Gulf) via scuba diving on January 2011. The species identification was done through morphological keys and review of their ossicles.