What is “Flashing” in Koi or Pond Fish?

What is “Flashing” in Koi or Pond Fish?

“Flashing” is basically just a fish that is “scratching” itself on the pond / tank bottom, or ornamentation. It USUALLY doesn’t mean anything, unless it’s “more and more common” or it’s happening at least hourly. There are lots of causes of flashing koi illuminated here (click).

Just some images (that may load slowly) of koi flashing:

flashing in koi

What is “Flashing” in Koi or Pond Fish?

koi itching

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Dr Erik Johnson

Dr Erik Johnson is a Marietta, Georgia Veterinarian with a practice in small animal medicine. He graduated from University of Georgia with his Doctorate in 1991. Dr Johnson is the author of several texts on Koi and Pond Fish Health and Disease as well as numerous articles on dog and cat health topics.