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You might have thought you were feeding the best food? Or didn't know which one was best? Here's how to tell!

Could you please explain what Flashing is?.......My Koi fish will occasionally jump or do little twists in the water....I always thought they were just playing....is this the sign of a disease though? I have an 8000 gallon pond with superb water quality.....thanks Paul Chapman

Flashing is a condition in which fish quickly lay over, then dash their sides against something in the pond. Often, they are trying to dislodge a parasite from their surfaces. In many other instances, they have been put into new water, water with a new pH, water with some Chlorine, or water with some other chemical irritant (high Ammonia levels for example.)

Flashing is normal in fish, when you see it once or twice per day per fish that would be 'okay' but if you see fish flashing two at a time in a pond it's more than coincidence and water quality, and CHANGES in water quality should be evaluated. For some people, it's simply the daily fluctuations in pH that cause the problem.

In other cases it's a parasitic issue. Several parasites cause profound flashing including but not limited to Costia, Flukes and Trichodina.

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Johnson Vet Services
Welcome to Johnson Vet Services in Marietta, Georgia. You can "meet" me and my clinic via this link. Will not function as a means of consultation.
Doc's Book
"Koi Health & Disease" my second book title. It's a thick book with Koi and pond fish disease information and "how to" instructions on bringing Koi back to health.
What Is In That Food?
KoiFoods.com is a site that impartially looks at the ingredient lists of various foods. Some are amazing. Some are shite. There's a section in there to help you assess foods the same way.

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