Case Study on Blackwater Treatment for Whiteleg Shrimp

2026-06-05

Breeding area: Qiaozhuang Town
Cultured species: Whiteleg shrimp
Cultivation model: Intensive farming in outdoor ponds
Water depth: 2 meters
pH: 9.1
Nitrite: 0
Ammonia Nitrogen: 0
Condition description: The water body is uniformly black; microscopic examination reveals 60% Euglenophytes, along with some green algae and organic matter.

Treatment plan: Apply around 10 a.m. on a sunny day. Water Change Boss 1 packet covers 1.5 mu per meter; mix with pond water and apply evenly across the entire pond. Use in the evening. Powerful bottom-conditioning decomposition 2 jin per mu.

The next day, microscopic examination revealed a small number of Euglena (with poor vitality), some green algae, and a few diatoms; use… Super algae strain 1 bottle covers 2 mu/m², supplementing the green algae population in the water.

 

On the third day, the pond water turned a pale green, and microscopic examination revealed that the pond was dominated by green algae, with a small amount of diatoms.
In the early stages of culture, water temperatures are low, and the growth of beneficial algae is slow. Euglena, being more active than green algae and diatoms, can outcompete them for nutrients and light, resulting in rapid growth and a high likelihood of blackwater formation during the initial phase.
Replace water‑conditioning agents with plant extracts, specifically formulated to target flagellate algae, thereby improving undesirable water colors such as blackening or reddening, promoting the dominant growth of beneficial algae, enhancing water clarity, balancing the algal community, and stabilizing nutrient levels.

 

This article was contributed by Cui Erkang and Ma Yukè.
Editorial Review: Zhang Chuanbao, Lü Zhaoqing, Zang Xueyun

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