A few years ago I saw the first "test" Alberta did with trout identification; they had like 22 photos of 5 or 6 species in different positions, color phases, etc. The average angler got about half of those correct.

Seems the reason for doing the test was to see how well anglers could tell brook trout from Bull trout as Alberta had areas where both species co-existed, but only the brook trout could be retained.

ClearCreek