Abstract
Abstract Fishing and boating activity on 50.2 miles of the Au Sable River in Crawford and Otsego counties, Michigan, was measured by stratified random sampling during 1960–63. On the main stream and South Branch of the Au Sable, man-hours of canoeing far exceeded fishing activity, whereas fishing constituted all but a minor fraction of the recreational activity on the North Branch. Observations during the daily period 8 AM-11 PM between the last Saturday in April and the second Sunday in September (regular trout season) led to the following estimates of average total hours of recreation (canoeing plus fishing) per season: Main Au Sable River–11,325 hours per mile per season, South Branch–3,354 hours per mile per season, North Branch–1,729 hours per mile per season. On the Main Au Sable, 32% of the recreational use was angling; on the South Branch, 44%; on the North Branch, 99.7%. On all three streams, 25 to 40% of the season's fishing was done between Decoration Day and 4 July. On the Main Au Sable most b...
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