|What a healthy pre-spawn Big Hole brown looks like|
Apparently there is a fungus going around called saprolengia that isn't too uncommon, but is severely affecting the spawn this fall. You can read all about it from FWP here, but the easiest solution to minimize your impact and protect the future of the fishery is to not be go fish over spawning fish, and particularly don't pull them off their redds. If you don't know what a redd is, look it up, but you can't miss them this time of year. There are a ton of other options around right now, so think about the future!