Influence of Feed and Stocking Density on Sand Purging Efficiency of White Clam (Meretrix lyrata) in a Recirculating System

Date Received: 02-05-2025

Date Accepted: 14-08-2025

Date Published: 28-08-2025

##submissions.doi##: https://doi.org/10.31817/tckhnnvn.2025.23.8.05

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Issue: Vol. 23 No. 8 (2025): Tạp chí Khoa học Nông nghiệp Việt Nam

Section:

CHĂN NUÔI – THÚ Y – THỦY SẢN

How to Cite:

Tuyet, T., & Dung, L. (2025). Influence of Feed and Stocking Density on Sand Purging Efficiency of White Clam (Meretrix lyrata) in a Recirculating System. Vietnam Journal of Agricultural Sciences, 23(8), 1024–1033. https://doi.org/10.31817/tckhnnvn.2025.23.8.05

Influence of Feed and Stocking Density on Sand Purging Efficiency of White Clam (Meretrix lyrata) in a Recirculating System

Tran Anh Tuyet 1 , Le Viet Dung (*) 1

  • Tác giả liên hệ: [email protected]
  • 1 Khoa Thủy sản, Học viện Nông nghiệp Việt Nam

    • Keywords

    Free-sand clam, microalgae, purging, recirculating, clearance rate

    Abstract


    This study evaluated the post-harvest sand depuration efficiency of market-sized Meretrix lyrata clams using a recirculating aquaculture system (RAS). A total of three laboratory experiments and 17 pilot-scale trials were conducted. The laboratory trials, each lasting 48 hours, independently examined the effects of three factors: microalgal (Chaetoceros gracilis) concentration (0, 11 × 103, 22 × 103, 33 × 103 cells/ml), feeding frequency (every 3, 6, 9, and 12 hours), and clam stocking density (18, 54, 90, 126 kg/m3). Assessing parameters included survival rate, proportion of clams containing sand, and clearance rate. The optimal microalgae concentration for depuration was determined to be 22 ×103 cells/ml. Feeding every 3 hours resulted in the highest sand removal efficiency; however, a 6-hour interval was adopted in subsequent trials to improve operational feasibility. The best performance in terms of sand removal and clearance rate was observed at a density of 18 kg/m3. Pilot-scale trials conducted under commercial conditions, with densities ranging from 170 to 380 kg/m3, demonstrated that RAS-based depuration was more effective than conventional aerated soaking when the treatment duration exceeded 24 hours. These findings highlight the potential of RAS technology to enhance clam depuration efficiency and provide a foundation for an optimized system aimed at improving meat yield recovery in future applications.

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