They are about the size of the palm of your hand and most easily recognized by the 5 black bars on their body.
They are mainly white, silver or light grey color with yellow highlights. But when the male is courting or guarding the egg patch that comes after the courting.... they turn this blue color.
And guard they do. They are not the least bit intimidated by a diver many, many times their size. More than a few times they have swum directly at me with the idea that they can drive me off.
On more than one occasion, when I have been closer than they liked or moving slower than they want.... they have even nibbled a knuckle or two to make their point crystal clear.
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