Tropical fish are packing up and moving south into new ecosystems that they've never lived in before. So why are they moving? And what impact is this move having on their behaviour?Sign up to our free newsletter at https://thedefrag.com/ - or become a paid member and get an ad-free feed and bonus episodes.Join our Discord: https://discord.gg/rHb7JVHz42Follow us on Facebook, Twitter, Instagram, or YouTube.Advertisers:Command Line Heroes: https://link.chtbl.com/commandlineheroes_cyoa?sid=s9.podcast.thedefrag