Common Bacterial Infections in Shrimp: Identify Treatment

Bacterial infection is not something a hobby article can confirm from appearance alone. White growths, dark shell patches, lethargy, failed molts, and deaths can involve bacteria, parasites, water molds, injury, ammonia or nitrite exposure, poor oxygen, or stress. Treat this page as a safety checklist, not a diagnosis.

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.

What To Check First

1. Test ammonia, nitrite, nitrate, pH, GH, KH, TDS, and temperature.
2. Review the last two weeks of changes: livestock, plants, food, cleaning, medication, substrate disturbance, and water-source changes.
3. Remove dead shrimp, leftover food, and decaying plant matter.
4. Move clearly affected shrimp to a matched quarantine container if possible.
5. Improve oxygen and keep the tank stable while you identify the likely cause.

What Changed About Treatment Advice

This page no longer gives peroxide, kanamycin, tetracycline, salt-bath, garlic, or herbal dosing recipes. Those instructions can be unsafe without diagnosis, exact water volume, product concentration, species sensitivity, and monitoring. FDA and veterinary guidance emphasize targeted therapy, diagnostic context, legal product use, and caution with antimicrobials.

Product And Antibiotic Caution

Do not assume a fish antibiotic, antiparasitic, or fungus product is shrimp-safe because it appears on a retail page. Use only label-supported products, avoid combining medications, and expect to monitor ammonia and nitrite after any treatment. For severe or repeated losses, contact an aquatic veterinarian, a fish-health lab, or an experienced shrimp breeder with water-test records and clear photos.

Next Step

Use the Shrimp Parameter Cheat Sheet and the Freshwater Shrimp Keeping hub to stabilize the system before treating. Then compare species needs in Neocaridina shrimp care guide and Caridina shrimp care guide.