Wild Wonders of Europe / Lundgren / School of European perch (Perca fluviatilis) edge of reedbed, Danube Delta, Romania, June.

Wild Wonders of Europe / Lundgren / European perch (Perca fluviatilis) Danube Delta, Romania, June.

Jussi Murtosaari / Silver bream (Blicca bjoerkna) and Perch (Perca fluvitalis) in aquarium, central Finland, May.

Sergey Gorshkov / English Perch (Perca fluviatilis) trio, Volga Delta, Russia

Jack Perks / Shoal of Roach (Rutilus rutilus) and Perch (Perca fluviatilis). A Brown trout (salmo trutta) swims into the frame, startling the shoal, as it looks for prey. The fish swims out of the frame. Rutland,...

Will Watson / European perch (Perca fluviatilis) on white background, Berrington Hall Pool, Herefordshire, England, UK. January. Focus stacked under controlled conditons.

Alex Mustard / Perch (Perca fluviatilis) swimming beneath overhanging branches, Whittlesea, Cambridgeshire, UK.

Alex Mustard / Young perch swimming in the rivers. River Nene, Castor, Peterborough, Cambridgeshire, England, United Kingdom.

Brian Bevan / Young European perch (Perca fluviatilis) swimming, Bedfordshire, UK, Novermber. Controlled conditions.

David Pattyn / Great crested grebe (Podiceps cristatus) with Perch (Perca fluviatilis) caught to feed to its young chicks, Valkenhorst Nature Reserve, Valkenswaard, The Netherlands, August.

Michel Roggo / European perch (Perca fluviatilis) Lake of Neuchatel, close to Boudry, Canton of Neuchatel, Switzerland, September.

Michel Roggo / European perch (Perca fluviatilis) Lake Neuchatel, Switzerland, September. Photographed for The Freshwater Project.