Great Lakes fish chinook salmon lake trout steelhead trout brown trout. Try just lightly misting the belly of a salmon and the customer will bring it back in a while when it really turns yellow underneath and give you a different shade. Great lakes trout or salmon Erie they have steelhead, Michigan, lakers slamon trout etc.
Personally I just wait to paint those fish until after they get dark usually about 3 weeks of drying does it.
If your fish is changing after that much time you'd better look into your degreasing techniques.
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