Great article worth a read at:

http://www.wnrmag.com/stories/2007/oct07/fishery.htm

Summary: Slots and modest bag limits key to fisheries management for
quality.

"Brown trout over 12 inches increased from 5 percent to 20 percent,
and brown trout over 18 inches increased tenfold from 0.3 fish per
mile to three fish per mile. The special regulations were successful
in producing a good catch-and-release fishery that could sustain
harvesting some fish."

Halfordian Golfer