Aggregation of Holothuria (Metriatyla) Albiventer Semper 1868 (Echinodermata: Aspidochirotida) on Seagrass Area of Medana Bay, West Lombok

Mapping technique has not been popular in holothurian monitoring procedures. We introduced the use of global positioning system to determine the local distribution pattern and estimate the individual number of Holothuria albiventer al Medana Bay, West Lombok, Indonesia. During ebb tide in the afternoon, when Holothuria albiventer were exposed, each individual found was marked and their positions were subsequently overlaid on a thematic map of Medana Bay. The results showed that 408 individuals of the species aggregated on a specific site of 894,47 m2, where coverage area of the sea grass reached 90%. Map of the distribution of holothurian populations in particular areas facilitated accuracy in estimating the potential of any holothurian species, and efficiency in monitoring efforts. Indonesian Fisheries Research Journal, Vol. 14, No. 1. Hal. 37-42