Effects of Probiotic Products and Benzalkonium Chloride on the Growth of Freshwater Green Microalgae and Cyanobacteria

Date Received: 23-04-2025

Date Accepted: 15-09-2025

Date Published: 31-10-2025

##submissions.doi##: https://doi.org/10.31817/tckhnnvn.2025.23.10.02

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Issue: Vol. 23 No. 10 (2025): Tạp chí Khoa học Nông nghiệp Việt Nam

Section:

CHĂN NUÔI – THÚ Y – THỦY SẢN

How to Cite:

Dung, L., Vung, D. V., Van, L., & Hong, P. (2025). Effects of Probiotic Products and Benzalkonium Chloride on the Growth of Freshwater Green Microalgae and Cyanobacteria. Vietnam Journal of Agricultural Sciences, 23(10), 1292–1300. https://doi.org/10.31817/tckhnnvn.2025.23.10.02

Effects of Probiotic Products and Benzalkonium Chloride on the Growth of Freshwater Green Microalgae and Cyanobacteria

Le Viet Dung (*) 1 , Doan Van Vung , Le Thi Cam Van , Pham Thi Lam Hong

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

    • Keywords

    Green microalgae, cyanobacteria, BAC, probiotic, Bacillus

    Abstract


    This study aimed to evaluate the effects of two probiotic products (Bacillus spp.: Biofloc02 and ProbioAqua) and the chemical compound benzalkonium chloride (BAC) on the growth of green microalgae and cyanobacteria under both laboratory and field conditions. The results showed that all three treatments reduced the cell density of the green alga Chlorella vulgaris, with BKC causing a rapid decline from day four, while the two probiotic products exhibited a milder effect, likely due to nutrient competition. For Arthrospira platensis, all treatments inhibited growth, with BKC causing complete mortality within four days. Similar trends were observed in freshwater nursery ponds, where the overall densities of green algae and cyanobacteria also declined. Algal density in treated ponds did not increase during 7-day trial. The findings provide practical insights into the effectiveness and impacts of commonly used algal control products in freshwater aquaculture, contributing to informed decision-making when selecting appropriate management strategies for pond ecosystems.

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