To encourage outdoor recreation in Waterton Lakes National Park, the lakes and streams were stocked with fish from the 1930's to the 1980's. 

The best fish for fishing were the rainbow trout and brook Trout. They are aggressive cold water fish who thrive in the mountain watersheds. 

The more aggressive rainbow and brook trout began to take over and push the bull trout and westslope cutthroat trout out of the waters. 

And so our waterways changed.