Description:
The shell is spoon-shaped and approximately 120 mm in length. The outer surface is covered with a brown, horn-like layer, with a dark green coloration near the shell margin. Young individuals exhibit a more vibrant green hue. Growth lines are smooth and clearly visible, particularly near the edge of the shell. The inner surface of the shell displays an iridescent, bluish nacre (based on the examined specimen).
Biology:
This species is a filter feeder. Reproduction occurs throughout the year, with peak spawning activity from January to March. The larvae are planktonic. Upon finding a suitable substrate, they attach and develop into adults. They often aggregate in clusters of 50-60 individuals.
Habitat and Ecology:
This species inhabits brackish water environments, commonly found in lagoons where freshwater and saltwater sources converge. Adults typically attach to substrates such as rocks, tree trunks, and pier pilings using byssal threads, residing approximately 40 cm above the seabed.
Distribution:
- Vietnam: Gulf of Tonkin, Hai Phong (Do Son), Quy Nhon (Thi Nai Lagoon), Phu Yen (O Loan Lagoon), Khanh Hoa (Nha Phu Lagoon, Thuy Trieu Lagoon).
- Global: Indian Ocean to the southwestern Pacific Ocean.
Economic Value:
This species has economic significance, with palatable meat and shells suitable for crafting handicrafts. It is an export commodity.
Conservation Status:
Currently, the species is being overexploited for handicraft production. There is a potential for population decline and range reduction. Threat Level: Vulnerable (Grade T).
Proposed Conservation Measures:
Implement seasonal harvesting guidelines and size regulations. Further research into aquaculture and planned harvesting strategies is needed.