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Mutant External Gilled Brook Trout

While fly fishing in some high alpine lakes, I ran into a weird fish!  It looks like a brook trout with external gills!  This fish was living under a rock near the bank, which surprised me.  I have never seen this before and I assume it is some kind of mutation due to low oxygenated water?  Anyone out there a fish biologist and can lend some more information?  At first I thought is may have been a deformity or abuse from an angler, but the gills are way too symmetrical I think for that to be the case.

Brook Trout External GillsExternal Trout GillsBrook Trout Mutant Gills

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