About the Show

European catfish, the continent's largest freshwater fish, are quickly evolving as they colonise new rivers, displaying bizarre new behaviours, colours and sizes.


Never miss a Nat Geo moment

Your email address
We use our own and third-party cookies to improve our services, personalise your advertising and remember your preferences. If you continue browsing, or click on the accept button on this banner, we understand that you accept the use of cookies on our website. For more information visit our Cookies Policy AcceptClose cookie policy overlay