ARLINGTON, Va. — Trout Unlimited will celebrate its 50th anniversary as the nation's largest and oldest coldwater conservation organization throughout 2009. Started in 1959 by 16 fishermen in Michigan who wanted to protect their local river, TU has grown to 140,000 members in 400 local chapters throughout the country, including a Green Bay chapter. TU has been instrumental in restoring more than 10,000 miles of rivers and streams around the country. Trout Unlimited will host a number of events to mark its 50th anniversary, including an August celebration at its annual meeting in Traverse City, Mich., located near the Au Sable River where TU was founded.