"Keep it if it is in season. Don't matter when you legally set the trap."
the year i got a fisher in season, it was on a remake of a set i snapped a gray fox in about 2 weeks prior....which was a set i put in about 2 weeks before that. so my steel was in the ground for at least a month, but what counted is i had a fisher in it during season. technically you didnt set your traps 'for fox and yote'; you set traps and hoped it'd snap a fox or yote. in reality, setting traps makes them functional on any kind of animal, including non-targets which i'm sure we've all caught. if your daily check nets a fisher in season, its yours, assuming you have a tag.