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I have had a koi with hikui, with no indication of contagion. A friend who is one of the most diligent koikeepers to be found has had it appear, with no contagion although the fish was kept for a couple or three years after the hikui appeared. Another locally has had it affect almost every Kohaku and Sanke placed in his ponds... which are well-maintained and house some very nice koi. I am increasingly coming to believe that there are more than one disease involved with similar symptoms, and that there just may be a viral link that results in a contagion in certain environments... Or, a mineral/metal component in the water that makes certain ponds more susceptible than others. It is very depressing to see a fine fish decline with hikui, and to see a whole pond decline makes kawarigoi look particularly attractive.
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