Michel Roggo / Northern pike (Esox lucius) amongst Shining pondweed (Potamogeton lucens), Lake Neuchatel, near Boudry, Canton of Neuchatel, Switzerland. September. Photographed for The Freshwater Project.

Michel Roggo / Watermilfoil (Myriophyllum spicatum) with some stems supporting clusters of Zebra mussel (Dreissena polymorpha) Lake Neuchatel, Switzerland. Highly commended in the Plants category of the Wildlife Pho...

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

Michel Roggo / View of African fish eagle (Haliaeetus vocifer),from underwater, trying to catch a fish on the surface, Okavango Delta, Botswana, June. Photographed for The Freshwater Project

Michel Roggo / Aquatic plants on the river bed of the Okavango river, Okavango Delta, Botswana, June 2014 . Photographed for The Freshwater Project

Michel Roggo / Meltwater channel through icefield in the Temnik River, Baikal Nature Reserve, Buryatia, Siberia, Russia, May 2015.

Michel Roggo / Autumn trees viewed from below Lake Baikal, Lake Baikal UNESCO World Heritage Site, Siberia, Russia. May 2013. Photographed for The Freshwater Project.

Michel Roggo / Fishes in the Sungai Melinau river, Gunung Mulu National Park, Sarawak, Borneo, Malaysia. Photographed for The Freshwater Project.

Michel Roggo / Freshwater spring in the intertidal zone of the Piccaninnie Ponds Conservation Park, South Australia, Australia. March 2015 . Photographed for The Freshwater Project

Michel Roggo / Rangimairewhenua or Blue Lake, Nelson Lakes National Park, South Island, New Zealand, February 2013. Photographed for The Freshwater Project

Michel Roggo / Water hyacinth (Eichhornia sp.) in a clear stream of the Pantanal, Brazil. Photographed for The Freshwater Project. Finalist in the Wildlife Photographer of the Year Awards (WPOY) Competition 2017.

Michel Roggo / Iceberg in the sea outside the Kangia Ilulissat Icefjord. Iceberg from the Sermeg Kujalleg Glacier, UNESCO World Heritage Site, Kalaallit Nunaat, Greenland, August 2014. Photographed for The Freshwate...

Michel Roggo / Underwater river scene with freshwater plants and Tetra fish, Aquario Natural, Rio Baia Bonito, Bonito area, Serra da Bodoquena (Bodoquena Mountain Range), Mato Grosso del Sul, Brazil November/Decembe...

Michel Roggo / Anavilhanas Archipelago in the Rio Negro, and flooded forest or 'Varzea forest' Amazonas, Brazil. February 2011

Michel Roggo / Brown bear (Ursus arctos beringianus) fishing for Sockeye salmon in the Ozernaya River, Kamtchatka, Russia, August

Michel Roggo / Perch (Perca fluviatilis). Juktan river, tributary of Umeälven river, Lapland, Sweden, July.

Michel Roggo / Grayling (Thymallus thymallus) on spawning ground. Lac de Fenetre, alpine lake, 2456 m above sea level, Canton of Valais, Switzerland, June.

Michel Roggo / Grayling (Thymallus thymallus) on spawning ground. Lac de Fenetre, alpine lake, 2456 m above sea level, Canton of Valais, Switzerland, June.

Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka) on spawning migration; males surrounding a female. Adams River, British Columbia, Canada, October.

Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka) on spawning migration. Adams River, British Columbia, Canada, October.

Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka) on spawning migration. Adams River, British Columbia, Canada, October.

Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka) on spawning migration. Adams River, British Columbia, Canada, October.

Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka) on spawning migration. Adams River, British Columbia, Canada, October.

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

Michel Roggo / Atlantic Salmon (Salmo salar) male, captive in fish-farm. France.

Michel Roggo / Chub fish (Leuciscus cephalus) and Mute swan (Cygnus color) swimming over, Rhine river, Schaffhausen, Switzerland. RUNNER-UP - Wildlife Photographer of the Year 2010.

Michel Roggo / Backwaters of the Rio Mamore with meanders and oxbow lake, Beni, Bolivia, January 2001.

Michel Roggo / Sunset at Rio Tabajos, near Santarem, Para, Brazil, 1994.

Michel Roggo / Rio Negro flooded during rainy season, Amazon, Brazil, 1993.

Michel Roggo / Yellow-spotted river turtle (Podocnemis unifilis), Los Lagos, Beni, Bolivia, October.

Michel Roggo / Spectacled caiman (Caiman crocodylus) at water surface. Beni, Bolivia, October.

Michel Roggo / Uaru / Triangle cichlid (Uaru amphiacanthoides) in flooded forest, Rio Tabajos, Amazon, Brazil.

Michel Roggo / Banded cichlid (Heros severus) in flooded forest. Rio Tabajos, Amazon, Brazil.

Michel Roggo / Three-barred / speckled peacock bass (Cichla temensis) entering flooded forest to spawn. Tributary Rio Tabajos, Para, Brazil.

Michel Roggo / Butterfly peacock bass (Cichla ocellaris) in flooded forest, Rio Tabajos, Amazon, Brazil.

Michel Roggo / Aracu (Leporinus sp.) in flooded forest, Rio Tabajos, Amazon, Brazil.

Michel Roggo / Matrincha (Brycon sp.) in flooded forest, waiting on surface for insects. Rio Tabajos, Amazon, Brazil.

Michel Roggo / Karst spring where water bubbles up from subterranean source, Julian Alps, Slovenia, June 2008

Michel Roggo / Underwater landscape in Spring creek, Saane river tributary, in winter, Gruyère, Fribourg, Switzerland. February

Michel Roggo / Underwater landscape in Spring creek, Saane river tributary, in winter, Gruyère, Fribourg, Switzerland. February

Michel Roggo / Underwater landscape in Spring creek, Saane river tributary, in winter, Gruyère, Fribourg, Switzerland. February

Michel Roggo / Underwater landscape in Hongrin River with ice on the river bed and surface in winter. Fribourg, Gruyère, Switzerland, December

Michel Roggo / Water plants in underwater landscape in chalk stream, Croatia, October

Michel Roggo / Underwater landscape in chalk stream, Croatia, October

Michel Roggo / Turbulent waters in Verzasca River, Tessin, Switzerland, October

Michel Roggo / Underwater landscape with fallen trees, Soca river, Slovenia, June

Michel Roggo / Underwater landscape in mountain lake with Rainbow trout, Berner Oberland, Swiss Alps, Switzerland, March

Michel Roggo / Underwater landscape in Verzasca River, Ticino, Switzerland, February