Holothuria (Metriatyla) scabra Jaeger, 1833 commonly known as a "sandfish," is the most highly esteemed among the consumers. In Thailand it is scarcely found, especially along the eastern coast of the Gulf, where only 2 reports of its occurrence have been known, and, specimens collected are imperfect in overall shapes. In 2006, a large-sized full-grown adult was encountered at Ko Man Nai area. This representing the 3 rd finding of the eastern shore and the first record of Mu Ko Man.