I know that i wouldn't keep them up too the point of white fungus,with steelhead I really couldn't tell you i've never really kept that dark of a steelhead,i would think up to about the point were they get the dark red on there sides and gill cover,but with kings i could tell you that i'll keep a bronze colored fish for the smoker but once they start to get that dark bronze to brown color back they go,if they are turning red you can forget it!

FISH ON!!!