The Alpine lakes where I hike and fish, in Washington's Cascades, were mostly void of fish prior to stocking efforts first occurring in the early 20th century. The Washington Cascade high lakes are very carefully stocked and managed as a public fishery and there is no problem with taking a fish or two for dinner. This site may be of help to some of you interested in fishing high lakes and stocking/management issues: http://watrailblazers.org/ Also, the site I mentioned earlier in this thread has a very helpful science module: http://hilakers.org/

Cliff