What should you do if there’s a lot of cyanobacteria in the shrimp pond before stocking?
2026-06-05
Case Details – Date: July 21, 2024
Location: Qiantang District, Hangzhou, Zhejiang Province
Area: 10 mu
Water depth: average 1.5 meters
Variety: Whiteleg Shrimp
In reality, given the customer’s urgent need to stock fry and the high abundance of cyanobacteria in the pond, we do not recommend using a cyanobacteria‑control product. Additionally, the downwind side is heavily infested with dead cyanobacterial blooms, with a thick oil film on the surface.
In the treatment plan, use one 1‑kg packet of Bacillus subtilis per mu, mix each packet with 1 jin of brown sugar, run an aerator at maximum aeration for 4 hours, then apply the mixture evenly across the entire pond at noon on a clear day. Focus on areas with heavy cyanobacterial blooms downwind, applying extra doses in those spots. In the evening, dry‑apply a high‑efficiency bottom‑decomposition agent (5 kg) at a rate of 5 mu per packet.
Usage effect
Case study: Bacillus subtilis degrades dead algae and breaks down macromolecular organic matter in the water, competing with cyanobacteria for nutrients. The resulting small‑molecule organic compounds can be directly assimilated and utilized by beneficial algae and microorganisms. Applied in the evening, a powerful bottom‑layer decomposition agent further decomposes undegraded dead algae at the pond bottom and chelates impurities in the water, thereby helping to suppress cyanobacterial blooms.
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