Not sure how reliable this is but I was once told by a biologist down in Olympia that this is actually hereditary in some hatchery fish. The reason he gave me was that these fish grow up the first part of their lives feeding on the surface. If you compare a common hatchery and wild fish you may notice a slight difference in the protusion of the lower jaw. This is caused by surface feeding as there mouths adapt to the feeding conditions.
Looks like a hooked nosed steelhead.
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"A river is remarkably like an elm-tree, and it requires but little imagination to picture it standing upright, with all of its lakes hanging upon its spreading branches, the topmost eighty miles in height.
John Muir