Identification:
This is a relatively large clam species, reaching up to 300 mm in size. The shell is nearly circular. The anterior auricle is small and distinct, while the posterior auricle is closely attached to the shell, making it difficult to distinguish. Growth lines are sparse, and the outer shell surface is brown. The inner shell surface exhibits a pearlescent luster. In adult individuals, the inner shell surface displays a yellowish hue along the mantle scar.
Biology and Ecology:
This species is a filter feeder, inhabiting subtidal zones from the low tide mark to depths of 80 meters.
Distribution:
- Vietnam: Cô Tô, Phú Yên, Khánh Hòa, Bình Thuận, Phú Quốc.
- Global: Indian Ocean, Western Pacific Ocean, Burma, Thailand, Indonesia, Philippines, Papua New Guinea, and Australia.
Value:
Valuable as a food source. The mother-of-pearl has high value in artistic crafts. It is capable of producing pearls and can be cultivated.
Conservation Status:
Currently heavily exploited, regardless of size. Populations are declining, and the distribution range is shrinking.
Classification: VU A1c,d.
Conservation Measures:
Listed in the Vietnam Red Data Book (1992) and on the IUCN list of protected species. Harvesting of small individuals should be restricted. Blasting and coral mining are prohibited. Development of aquaculture and pearl cultivation is encouraged.