Henderson Area Ducks Where Are They?

Frist split murdered the ducks limited out everyday 6-8 hunters. Opening day second split 3 hunters got our limit. 2nd day 8 hunters got our limit, but it took till noon to do it. Today 2 hunters no birds killed at all. We did miss a few shots, but very little activity after 7:15am almost nothing flew maybe 15 ducks from that time till 9:am. Also saw very few ducks in our fields that had normally held thousands of ducks.

What could have caused this?