John Waters / Slow motion clip of a Brown trout (Salmo trutta) breaching to predate an adult Mayfly (Ephemoptera) emerged on the surface, River Kennet, Hungerford, Berkshire, England, UK, June.

John Waters / Slow motion clip of a Brown trout (Salmo trutta) predating an adult Mayfly (Ephemoptera) struggling to take off from water, River Kennet, Hungerford, Berkshire, England, UK, June.

John Waters / Small shoal of Brown trout (Salmo trutta) swimming and feeding in the River Kennet, Berkshire, England, UK, March.

Ingo Arndt / Mass of Sea trout (Salmo trutta trutta) eggs, with embryos visible, Europe.

Ingo Arndt / Sea trout (Salmo trutta trutta) alevin just hatched with full yolk sac, Europe

John Waters / Pair of Brown trout (Salmo trutta) spawning, with others eating eggs, River Kennet, Berkshire, England, UK. March.

John Waters / Pair of Brown trout (Salmo trutta) spawning, with another male trying to fertilise eggs River Kennet, Berkshire, England, UK. February.

Ann & Steve Toon / Osprey (Pandion haliaetus) catching trout, Rothiemurchus estate, Cairngorms, Scotland, UK, July

Laurent Geslin / Red fox (Vulpes vulpes) carrying Brown trout (Salmo trutta) found near a fishing pond, England

Linda Pitkin / 2020VISION / Brown trout (Salmo trutta) fry on river bed, Cumbria, England, UK, September.

Linda Pitkin / 2020VISION / Fisheries assistant Stephanie Kershaw and volunteer John Dumont at the Eden Rivers Trust electrofishing for juvenile Atlantic salmon (Salmo salar) and Brown trout (Salmo trutta) as part of a capture a...

Andy Trowbridge / Split level shot of a fly fisherman (Murray Trowbridge) releasing a large brown trout (Salmo trutta) in a gin clear 'backcountry' river, North Canterbury South Island, New Zealand. January, 2012. Mode...