Linda Pitkin / 2020VISION / Brown Trout (Salmo trutta) in disused quarry, Jackdaw Quarry, Capernwray, Carnforth, Lancashire, UK, August. Did you know? Brown trout scales have growth rings like tree trunks.

Andy Rouse / Osprey (Pandion Haliaetus) catching trout on a foggy morning, Scotland, UK, July.

Andy Rouse / Brown trout (Salmo trutta) jumping for insects, Scotland, UK..

Michel Roggo / Lake trout (Salmo trutta lacustris) morph of Brown Trout, leaping upstream on migration to spawning ground from the Lac de Neuchâtel, Areuse River, Switzerland, 1989

Wild Wonders of Europe / Falklin / Brown trout (Salmo trutta) hunting Mayfly (Ephemera Danica), Dala river, Gtene, Vstra Gtaland, Sweden, June 2009

Jeff Vanuga / Man fly fishing for trout in a river in the Shoshone National Forest, Wyoming, USA, model released. July 2008

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...

Laurie Campbell / Brown trout (Salmo trutta) resting on river bed near the Aigas Field Studies Centre, Inverness-shire, Scotland, July

Wild Wonders of Europe / Falklind / Sea trout (Salmo trutta) leaping above water migrating upstream, Vester Herred, Bornholm, Denmark, October 2009

Linda Pitkin / 2020VISION / Brown Trout (Salmo trutta) in disused quarry, Jackdaw Quarry, Capernwray, Carnforth, Lancashire, UK, August

Michel Roggo / Brown trout (Salmo trutta fario) eggs in a hatchery, Europe, Captive

Michel Roggo / Brown trout alevins (Salmo trutta fario) in a hatchery, Europe, Captive