Posted 24 June 2012 - 06:46 PM
so first question before I even guess... where were you? What state and river?
next, yes it is likely that it is a breeding coloration... but one thing that some people have noticed before... the blue on teh head may not really be blue... it may be tuburculation on teh head of the fish. I have noticed that a profusion of fine tubucules (that are essentially just whitish bumps on small fish) often look rather bluish when viewed from farther away or from above the waters surface.
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