The introduction of lake trout in Yellowstone National Park devastated their native fishery as well as lots of birds and wildlife. The park is now spending $2 million a year in an effort to rid Yellowstone Lake of lake trout.
Their rules now require lake trout to be killed. It is illegal to release them alive.
And here’s the conclusion to the story:
But for an angler standing by a stream and casting out a line, the thought that rises helplessly to mind is that every species we lose, every habitat we compromise in the name of “human convenience,” is one more piece of the American character and of our own souls inadvertently washed away into oblivion.
Here’s the sad story.
https://www.nytimes.com/2019/05/13/opinion/fishing-species-extinction-yellowstone.html