From this story in the Los Angeles Times:
The U.S. Fish and Wildlife Service will begin conducting its national survey of fishing, hunting and wildlife-associated recreation and are requesting that hunters, anglers and other wildlife enthusiasts participate if contacted for interviews scheduled to begin April 1. The information, collected by the U.S. Census Bureau primarily through telephone interviews to be conducted April to June and September to October this year and January to March, 2012, provides the only comprehensive statistical database available on Americans' participation in and spending on hunting, fishing and wildlife-watching in the 50 states.
"We appreciate the anglers, hunters, birdwatchers and other citizens throughout the United States who voluntarily participate in the survey when contacted," said the wildlife service's acting director, Rowan Gould. "The survey results help wildlife and natural resource managers quantify how much Americans value wildlife resources in terms of both participation and expenditures." The survey, conducted every five years since 1955, will involve 53,000 households from the Census Bureau's master address file. From this information, the bureau will select samples of 19,000 anglers and hunters and 10,000 wildlife watchers and follow up with further detailed questions.