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How to safely use salt baths for minnow black spots and parasites?

Updated On September 23rd, 2025

Pet's info: Fish | Pond | 0.05 lbs

Will a salt bath remove or kill encysted black spots from parasites on a wild caught minnow? Will the salt harm the minnow? What dosage should be used for how long in a small treatment container (not the main tank).

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Answered By Todd Cecil

Veterinarian

Published on October 24th, 2018

Non-iodized salt can be used as an immersion bath (short term) at 10-30 g/L for up to 30 minutes. Keep a close eye on the fish for stress or rapid respiration as some fish can only tolerate the higher dose for minutes. This can be repeated every 2-3 days. It is difficult to determine in the pictures whether this is a parasitic problem or not. Black areas can be the result of melanin pigments, a sign of trauma. A visit to a veterinarian acquainted with fish could perform a skin scrape and examine under the microscope for a diagnosis. Good luck.

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