I believe Dr. Kevin Hunt at Mississippi State has conducted an angler survey study for the state of MS similar to what you are referring to. He specializes in the field of human dimensions with regards to hunting and fishing.
I know a couple of years ago he had officers asking anglers similar questions about how much $$$ was spent and how many miles were driven to fish, ect.
Here's his contact info and a list of some publications...
http://www.cfr.msstate.edu/wildlife/...=12&persID=220
Hope this helps.