For many people, the humble goldfish is their first pet. Swimming in a tank in your house, it’s hard to imagine it’s much of a threat. But released into the Great Lakes, this iconic fish can imperil the fragile ecosystem of the largest freshwater system in the world. Christopher Booker has the story.

Subscribe:
Newsletters: https://www.pbs.org/newshour/subscribe'>https://www.pbs.org/newshour/subscribe
PBS NewsHour podcasts: https://www.pbs.org/newshour/podcasts'>https://www.pbs.org/newshour/podcasts

Stream your PBS favorites with the PBS app: https://to.pbs.org/2Jb8twG
Find more from PBS NewsHour at https://www.pbs.org/newshour
Subscribe to our YouTube channel: https://bit.ly/2HfsCD6

Follow us:
TikTok:   / pbsnews  
Twitter:   / newshour  
Instagram:   / newshour  
Facebook: http://www.pbs.org/newshour