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Chilodonella

ChilodonellaChilodonella is one of the hottest fish killers there is. Under the scope you may see a heart shaped organism, or a large round organism full of tiny bubbles. Alive, the Chilodonella resembles a heart shaped onion, with a fuzzy end where you could imagine the onions roots would be. These are actually cilia. Dead, Chilodonella are motionless round balls full of tiny bubbles. They may resemble Ich but they do not have a crescent nucleus nor do they move in their dead, rounded state.

Chilodonella clears EASILY with salt. Leave the salt in for 14 days, and be sure to supplement aeration, as gill damage d/t Chilodonella may be severe in the survivors. Chilodonella should be suspected anytime large numbers of fish are dying on the surface, or who roll over on their sides except when disturbed, the Koi dash madly.

Update:because of the over use or salt, there are now many “salt resistant” parasites. If the parasites do not respond to salt, the recommended treatment would be TERMINATE which is made to treat “salt resistant” parasites.