Three weeks ago , I was up at the Oswego fishing for Kings and, although there weren’t many fish around , the few that were eager to strike a fly . Now , the situation is the opposite : loads of Kings in the water but no takers on the fly ( or spinning lures/ bait from what I saw , for that matter ) . What changed in this 3 week span? I’ve read before that king salmon Gradually Begin to deteriorate Upon entering freshwater rivers ; this includes , most notably , their digestive tract . But this starts to happen almost immediately upon entering , correct? Why Then, will they strike flies early In the run but not later ??