Biomass values of above-ground and below-ground for seagrasses are summarized by Lewis, et at. (1985) and Virnstein and Howard (1987). But limited information is available on production and utilization of organic matter originating from roots and rhizomes of seagrass in the Asean region. Similarly, only a few studies on community structure, primary production and biomass of seagrasses have been reported from this region (Estacion and Fortes, 1988; Azkab, 1991; Rollon and Fortes, 1991). Seagrass habitat utilization by groups of animals, such as fishes and crustaceans, was investigated and reviewed by Dolar (1991), Sudara, et al. (1991), and Vergara and Fortes (1991).