ABSTRACTIsland Klah is an island located in the Bay of Sabang, the island is surrounded by coral reefs shallow habitats for economical biota especially giant clams (Tridacnidae). The objective of the present sudy was to evaluate the abundance and distribution pattern of Giant clam (Tridacnidae) in the water of the island Klah of Sabang city. The research was carried out on December 2016 to January 2017. Survey was done by purposive sampling method. Giant clams data retrieval using belt transects method. A ten meter length of transect line were established in depth of 1 to 2 m.The observations were done in 2,5 m to the left and 2,5 m the right. The research result discovered two types of giant clams namely Tridacna crocea, and Tridacna maxima. The species composition giant clam was tridacna crocea (69%) and Tridacna maxima (31%). The abundance of Tridacna crocea ranged 0,3 - 0,56 ind/ m2, and Tridacna maxima ranged 0,02 - 0,3 ind/ m2. The distribution pattern of Tridacna crocea has clumped distribution and Tridacna maxima has unifom distribution. Key words: Giant clam, Tridacnidae, Abundance, Klah Islands, Sabang?ABSTRAKPulau klah merupakan sebuah pulau yang terletak di Teluk Sabang, pulau ini dikelilingi oleh hamparan terumbu karang yang dangkal sehingga menjadi habitat bagi biota-biota ekonomis khususnya kerang kima (Tridacnidae). Penelitian ini bertujuan untuk mengetahui kelimpahan dan pola sebaran kerang kima (Tridacnidae) di perairan Pulau Klah Kota Sabang. Penelitian ini dilakukan pada bulan Desember 2016 sampai Januari 2017. Pengamatan dilakukan secara purposive sampling. Pengambilan data kerang kima mengunakan metode belt transek. Panjang transek 10 m pada kedalaman 1 sampai 2 m secara horizontal. Dengan luasan 2,5 m kiri dan kanan. Berdasarkan hasil penelitian ditemukan 2 jenis kerang kima yaitu Tridacna crocea, dan Tridacna maxima. Komposisi jenis kerang kima adalah Tridacna crocea (69%) dan Tridacna maxima (31%). Kelimpahan pada Tridacna crocea berkisar 0,3 - 0,56 ind/ m2, dan Tridacna maxima berkisar ...