Back a while ago Crocker Lake, up near Discovery Bay, was rotenoned to remove northern pike. Along with them, a really nice pot of largemouth were also eliminated.

To WDFW's credit they did not put bass back in, even though the lake had been a well known bass lake. Instead, the native salmonids were left to the lake. Prior to exotics removal the whole system put out a maximum of 10-12K coho smolts. The lake itself is now producing 20-30K or more.