Rivers are vitally important to the health of the planet. Andy heads to the Amazon River basin to discover the secrets of one of largest rivers in the world while Chuck spends time helping to clean up the Seine River in Winnipeg. Dr. Greenie spends some time with Fishstick. He is concerned about the migration of invasive fish species into the lakes and rivers of North America and when it’s time to clean Fishstick’s tank it gets taken over by a shark - who looks a lot like GP with a fin on his head.

Originally released by Distribution360, 2014. Streaming video file encoded with permission for digital streaming by Infobase on June 26, 2015.

Amazon River Water Flow (3:39); --Amazon River and Seine River (4:10); -- Invasive Species (4:16); -- Mountain Lions (4:17); -- World's Biggest Fish (3:17); -- Credits: Gone Fishing: Planet Echo Season 4 (0:59); -- Mountain Lion Background Information (1:26); -- Gone Fishing Custom Segment (11:30); .