Nick Hawkins / Atlantic salmon (Salmon salar) under river ice. Quebec, Canada. October.

Nick Hawkins / Atlantic salmon (Salmo salar) migrating for spawning in river, Gaspe Peninsula, Quebec, Canada, October.

Nick Hawkins / Two Atlantic salmon (Salmo salar) silhouetted against sky, Gaspe Peninsula, Quebec, Canada, October.

Michel Roggo / Atlantic salmon (Salmo salar) migrating upstream to spawn, Quebec, Canada Photographed for the Freshwater Project.

SCOTLAND: The Big Picture / Atlantic salmon (Salmo salar) leaping up a small waterfall in order to reach breeding grounds further upstream, Cairngorms National Park, Scotland, UK, October.

Ann & Steve Toon / Atlantic salmon (Salmo salar) leaping on upstream migration, River Tyne, Hexham, Northumberland, UK, November

Will Watson / Atlantic salmon (Salmo salar) leaping a weir, Shrewsbury, River Severn, Shropshire, England, UK. November.

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...

Michel Roggo / Atlantic Salmon (Salmo salar) in pool on upstream spawning migration. Quebec, Canada, August.

Rob Jordan / 2020VISION / Atlantic salmon (Salmo salar) leaping up the cauld at Philphaugh Salmon Viewing Centre near Selkirk, where members of the public can view the spectacle, Selkirkshire, Scotland, UK, October 2011

Rob Jordan / 2020VISION / Captured Atlantic salmon (Salmo salar) awaiting tagging by Tweed Foundation staff monitoring fish movement, density and biology, River Tweed, Berwickshire, Scotland, UK, September

Laurie Campbell / Two Atlantic salmon (Salmo salar) acending waterfall to reach spawning beds, Perthshire, Scotland, November