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This is the largest living Bivalve in the world. In my hometown (Surigao) we call it "Takyobo". In the Philippines it is commonly called as "Taklobo". This is one of the most endangered clams in the world. Algae provide giant clams with a supplementary source of nutrition. The main reason that giant clams are becoming endangered is likely to be intensive exploitation by bivalve fishing vessels. Mainly large adults are killed since they are the most profitable. IUCN Conservation Status is Vulnerable.