Feral goldfish. An illegal crayfish trade gone wrong.  An electric underwater fence that stuns fish in their tracks. On Introduced, we dive into stories of the aquatic invaders that are costing us millions and changing the lakes, streams, and wetlands we cherish and rely on. Join us each week as we learn how these creatures wound up here and meet the people working to protect our waters.
Introduced is produced and hosted by Bonnie Willison and Sydney Widell. Please subscribe on iTunes, Spotify, or Google Play. Send in your questions and comments to
Transcripts of the episodes can be downloaded below:
Crayfish, cargo and chaos: How we got here