Fish the upper Rogue River 90% of time and it does get 'hatches' frequently. But last week I think I got the idea of what a HATCH really is. MILLIONS UPON MILLIONS of cadis going off at one time; the air was a living, moving wall for 5 days. And fishing was deader than a door nail. Suspect with the pure numbers of muching opportunities a fish actually picking out your fly from the milllllliooons to choose from was a real shot in the dark.