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I have seen some Rainbow trout like that before. Does the state or a private group stock the area with Rainbow trout? In Missouri, where I am from, they have spring fed streams/rivers that they stock with rainbows. The state raises them in concrete rearing pools. While they are growing the bows will rub up against the walls and floor of the pool. When they do that they start showing deformations on the fins and on the tip of the upper jaw.
stocked bow with a smashed face from banging against teh walls at the hatchery, i've seen them like that before, and some even more ugly.