Wildlife filmmaker Jack Perks uses the skills he's perfected working on shows like BBC Springwatch to showcase the various freshwater fish found in the UK's rivers, streams and waterways. As a keen fisherman and conservationist Jack has long felt that the UK's freshwater fish species are often overlooked, both by natural history filmmakers and environmentalists. In this film he meets some of those people working to safeguard the diverse species, and captures footage of some captivating residents of Britain's waters.