Massive goldfish, weighing up to dozens of pounds, are popping up in freshwater lakes across the United States and they are posing a major threat to the ecosystem. Scientists say the fish were formerly pets that were flushed or released into local lakes and keep growing with access to food. NBC’s Maggie Vespa reports for TODAY. » Subscribe to TODAY: youtube.com/@TODAY About: TODAY brings you the latest headlines and expert tips on money, health and parenting. We wake up every morning to give you and your family all you need to start your day. If it matters to you, it matters to us. We are in the people business. Subscribe to our channel for exclusive TODAY archival footage & our original web series. Connect with TODAY Online! Visit TODAY's Website: today.com Find TODAY on Facebook: facebook.com/today Follow TODAY on Twitter: twitter.com/TODAYshow Follow TODAY on Instagram: instagram.com/todayshow » Stream TODAY All Day: http...