The Harm Caused by Euglena and Its Solutions
2026-06-05
Recent prolonged periods of overcast, rainy weather have triggered algal blooms and water quality issues. Even when naked algae appear in the pond, many farmers still assume their water is fine and fail to take corrective action, leading to substantial losses. In fact, when Chlorella, Spirulina, and Oocystis dominate the algal community, the water typically takes on a pale green hue. However, if naked algae are present, the resulting color can also be green—so subtle that, without careful observation, the green of naked algae can easily be mistaken for that of beneficial algae.
Diatom blooms exhibit a variety of water colors, but the three most common are:
① Green and bluish-green; green Euglena is the dominant species, and its green chloroplasts give the algal bloom a green hue, which turns bluish-green upon massive proliferation.
② Reddish-brown, commonly referred to as “rust color” or “rust-colored water,” is a bloom phenomenon caused by the red‑blooded Euglena.
③ Soy sauce color; the water color changes little.
Hazards Posed by Euglena Water
1. Euglena thrives in well-lit, organic‑rich, still waters without flowing currents. It reproduces rapidly; when it proliferates extensively, it often causes a rise in pH. A short‑term increase in pH can induce stress in aquatic organisms, while elevated levels of toxic ammonia in the water may lead to ammonia‑nitrogen poisoning.
2. Euglena exhibits strong phototaxis: under intense sunlight, it rises to the water surface, inhibiting the growth of other algae. When Euglena proliferates extensively and covers the entire water surface, it not only seals off the water column but also restricts the diffusion of atmospheric oxygen into the water. Meanwhile, the decomposition of organic matter at the bottom of the water body consumes large amounts of dissolved oxygen, resulting in extremely low oxygen levels beneath the surface. In such hypoxic conditions, pathogenic bacteria multiply rapidly, weakening the shrimp’s health and making disease virtually inevitable.
3. Euglena is inherently difficult to digest; after being ingested by shrimp, it is poorly digested and can easily lead to enteritis.
4. When Euglena blooms die off en masse, they can rapidly degrade water quality; their decomposition consumes large amounts of dissolved oxygen and generates substantial quantities of toxic substances such as ammonia nitrogen and nitrite. Meanwhile, the algal toxins secreted by Euglena can also exert harmful effects on aquatic organisms.
Diatom bloom in the water body of a customer in Qiaozhuang, Binzhou.
Water body before use
Algal community before use
Use Gai Shui Ba Wang at a rate of 1.5–2 mu per packet; it powerfully inhibits the proliferation of harmful algae, promotes the growth of beneficial algae, balances the algal community, and improves poor water quality. For best results, soak the product in water for 2 hours beforehand.
The next morning, Bishui detoxified and An Guo acid neutralized toxins.
In the afternoon, apply a powerful bottom-conditioning agent at a rate of one jin per mu to break down dead algae.
For routine water quality management, apply 1 bag of concentrated Bacillus subtilis per 2 mu and 1 bag of concentrated photosynthetic bacterial powder per 2 mu to activate the live cultures. Alternatively, use one bottle of lactic acid bacteria stock solution for every 2 mu to regulate pH and prevent the proliferation of harmful algae. In addition, during hot weather, be sure to increase aeration.
Post-use water body
Algal community after use
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