I believe the warden needed that info to know where to send the free lifetime supply of duct tape, and banjo strings! j/k

Actually, like Dogfish said, in-case the perps challenge the ticket in court, they may need you to testify. You think what you saw was bad that day, wait till November! You won't hear much english spoken either by anyone casting between the buoys!

I'm not aware of any cash reward for turning in poachers (don't we wish) I would say just be proud of a job well done.