Crossword Genius

Colorful fish in a water garden (3)

Ross

I believe the answer is:

koi

(Other definitions for koi that I've seen before include "Kind of decorative carp" , "Japanese type of carp" , "Large Japanese carp" , "Colourful ornamental carp" , "Sort of carp" .)

I've seen this clue in the USA Today.
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