Post by: Bullkllr on April 18, 2013, 08:03:31 AM
http://sites.ewu.edu/Eastern247/2013/04/17/solving-the-salmon-puzzle-in-lake-roosevelt/ (http://sites.ewu.edu/Eastern247/2013/04/17/solving-the-salmon-puzzle-in-lake-roosevelt/)
One of the more interesting passages:
"When the Colville Tribe tried to restore natural-spawning kokanee and rainbow trout to the Sanpoil River, Scholz and his team discovered that walleye and smallmouth bass were waiting for them just as they were swimming out of the free-flowing Sanpoil River into a section that is inundated by Lake Roosevelt. In a controlled study, they discovered that in 112 days the walleye ate 94 percent of hatchery released 0.5-year-old kokanee fry, 40 percent of the 1.5-year-old kokanee smolts, 24 percent of the 1-year-old and 27 percent of the 2-year-old wild rainbow smolts. Individual walleye that had their stomachs pumped regurgitated as many as 47 kokanee!
This data led to the only real answer—reduce the walleye in the lake. After a good deal of educating the Washington Department of Fish and Wildlife, the agency has finally done something to reduce the numbers of walleye in Lake Roosevelt."
Post by: HUNTINCOUPLE on April 18, 2013, 08:12:30 AM
Post by: DoubleJ on April 18, 2013, 08:28:54 AM
Post by: Roosevelt walleye on April 18, 2013, 01:47:13 PM
Over the years, through many experiments and research projects, Scholz has helped increase the number of salmon that return to spawn from 0.5 percent to between 2 and 5 percent, which is the normal rate of return in a healthy system