Nothing. The best thing for hatcheries to do, some already do this, is to build a low fence across the creek. There are gates in the fence that are opened to allow the late ariving fish to pass after the quota for the hatchery is filled.

Jay
_________________________
They say that the man that gets a Ph.D. is the smart one. But I think that the man that learns how to get paid to fish is the smarter one.