Approx. 2 minutes read
White cottony growth on shrimp may be a water mold, fungus-like growth, bacterial growth, parasite, injury site, or debris caught on the body. It is a warning sign, but it is not enough to identify the cause from a blog post alone.
Not sure what you are looking at? See the shrimp disease and illness overview for first checks and medication cautions that apply across all of these.
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Immediate Triage
- Isolate the affected shrimp if you can match temperature and water chemistry closely.
- Test ammonia, nitrite, nitrate, pH, GH, KH, TDS, and temperature.
- Remove dead shrimp, dead eggs, leftover food, and decaying plant matter.
- Improve oxygen and reduce organic waste without deep-cleaning the whole tank at once.
- Photograph the growth under bright light so you can compare changes over time.
Treatment Caution
This article no longer recommends retail fungus medications, salt-bath recipes, or Indian almond leaves as fixes. Leaves and botanicals can be useful habitat and grazing surfaces, but they should not be presented as a proven treatment for a diagnosed infection. If using any medication, follow the label, confirm it is appropriate for invertebrates, and avoid treating the main colony unless the risk is justified.
Prevention
Most prevention is husbandry: stable water, clean but mature filtration, quarantine for new livestock and plants, quick removal of dead animals, and careful feeding. Use the Freshwater Shrimp Keeping hub, Shrimp Parameter Cheat Sheet, Neocaridina shrimp care guide, and Caridina shrimp care guide for the baseline routine.
Sources used: UF/IFAS fish health management, UF/IFAS stress and fish disease, UF/IFAS water-quality problem solving, FDA aquaculture drug basics, and FDA ornamental fish drug guidance.