Montana anglers spend nearly 3 million days a year in pursuit of an array of fish in the state’s rivers, lakes and streams, FWP’s latest angler survey reveals. Montana angling surveys, now conducted every two years, have been done as early as 1958, when 1.42 million angler days were recorded. An "angler day" is one angler fishing one body of water for any length of time in a given day. The 1997 Montana Statewide Angling Pressure Survey shows: