Remi Masson / Pike (Esox lucius) hunting in a shoal of Perch (Perca fluviatilis), Lake Neuchatel, Switzerland. June.

Remi Masson / Large Pike (Esox lucius) more than a meter long, resting on a lake bed, Lake Neuchatel, Switzerland. June.

Remi Masson / Waterlily (Nymphaea alba) flower which has opened underwater in a lake. Alps, Ain, France, June.

Remi Masson / Waterlily (Nymphaea alba) flower which has opened underwater in a lake. Alps, Ain, France, June.

Remi Masson / Underwater view of Waterlilies (Nymphaea alba) in a lake. Alps, Ain, France, June.

Remi Masson / Underwater view of Waterlilies (Nymphaea alba) in a lake. Alps, Ain, France, June.

Remi Masson / European beaver (Castor fiber) eating branches in the water before approaching the camera, River Rhone, Rhone-Alpes, France, June.

Remi Masson / Group of Barbels (Barbus barbus) spawning, River Rhone, Rhone-Alpes, France, April.

Remi Masson / Water lilies (Nymphaea alba) lit by the sun's rays, seen under water. Alps, Ain, France. June. Highly commended in the the Underwater World category, GDT European Wildlife Photographer of the Year 201...

Remi Masson / Common toads (Bufo bufo) mating surrounded by strings of toadspawn. Ain, Alps, France. First prize in the category "The Underwater World, GDT European Wildlife Photographer of the Year 2014 competiti...

Remi Masson / Group of Black bullhead (Ameiurus melas) shoaling to protect themselves against predators, River Rhone, Rhone-Alpes, France, July.

Remi Masson / Tracking shot of a Eurasian beaver (Castor fiber) swimming underwater, turns to look at camera, River Rhone, Rhone-Alpes, France, June.

Remi Masson / European crayfish (Astacus astacus) in a lake. Alps, Switzerland, July.

Remi Masson / Eurasian beaver (Castor fiber) carrying branches back to lodge, dropping them when alarmed. River Rhone, Rhone-Alpes, France, June.

Remi Masson / Pair of Pumpkinseeds (Lepomis gibbosus) mating, male chasing other individuals away, River Rhone, Rhone-Alpes, France, June.

Remi Masson / Male Common toads (Bufo bufo) fighting underwater during mating season, with a pair mating Ain, Rhone-Alps, France, March.

Remi Masson / Group of Nase (Chondrostoma nasus) and Barbels (Barbus barbus) spawning, River Rhone, Rhone-Alpes, France, April.

Remi Masson / Shoal of Nase (Chondrostoma nasus) spawning, River Ain, Rhone-Alpes, France, April.

Remi Masson / Group of Wels catfish (Silurus glanis) gathered in the River Rhone, France, August.

Remi Masson / European beaver (Castor fiber) swimming underwater and urinating, River Rhone, Rhone-Alpes, France, June.

Remi Masson / Group of Wels catfish (Silurus glanis) a tthe bottom of a river. River Loire, Indre-et-Loire, France. October.

Remi Masson / European catfish (Silurus glanis) in the middle of a school of Fish (common bleak). River Loire, Indre-et-Loire, France. October.

Remi Masson / Group of Wels catfish (Silurus glanis) at the bottom of a river. River Loire, Indre-et-Loire, France. October.

Remi Masson / Giant wels catfish (Silurus glanis), longer than two meters, swimming above the bottom of the lake of Neuchatel, Switzerland.

Remi Masson / Common toads (Bufo bufo) in mating ball, Ain, Alps, France, April.

Remi Masson / Common toads (Bufo bufo) in mating ball, Ain, Alps, France, April.

Remi Masson / Caver in Glandieu waterfall cave with stalagmites, stalactites and columns, Ain, Alps, France. August 2019.

Remi Masson / Glandieu waterfall cave. Ain, Alps, France, January 2020.

Remi Masson / Glandieu waterfall cave. Ain, Alps, France, January 2020

Remi Masson / Caver in Glandieu waterfall cave with stalagmites, stalactites and columns, Ain, Alps, France. August 2019.

Remi Masson / Glandieu waterfall cave. Ain, Alps, France, January 2020

Remi Masson / Glandieu waterfall cave with stalagmites, stalactites and columns, Ain, Alps, France. August 2019.

Remi Masson / Aerial view of lake in a bog. Ain, Alps, France. March 2020.

Remi Masson / Water lily (Nymphaea alba) flower underwater in lake, Ain, Alps, France, June.

Remi Masson / Yellow-bellied toad (Bombina variegata) underwater in Thurignin Canyon, Seran river. Alps, France, August.

Remi Masson / Waterlily (Nymphaea alba) flower underwater in a lake. Ain, Alps, France

Remi Masson / Waterfall in the Seran river flowing through the Thurignin Gorge, Ain, Alps, France, January 2020.

Remi Masson / Sugar bread waterfall, La Beze river. Ain, Alps, France, January 2020.

Remi Masson / Seran river flowing through the Thurignin Gorge, Ain, Alps, France, January 2020.

Remi Masson / Seran river flowing through the Thurignin Gorge, Ain, Alps, France, January 2020.

Remi Masson / Aerial view of a Karst spring and river, Marais de Lavours Reserve, Ain, Alps, France, November.

Remi Masson / Karst spring, Marais de Lavours Reserve, Ain, Alps, France, November.

Remi Masson / Underwater view of Karst spring, Marais de Lavours Reserve, Ain, Alps, France, November.

Remi Masson / Aerial view of a Karst spring, Marais de Lavours Reserve, Ain, Alps, France, November.

Remi Masson / Aerial view of a Karst spring, Marais de Lavours Reserve, Ain, Alps, France, November.

Remi Masson / Aerial view of a Karst spring, Marais de Lavours Reserve, Ain, Alps, France, November.

Remi Masson / Ice in a mountain lake. Aiguilles Rouges Reserve, Haute-Savoie, France. July.

Remi Masson / Ice in a mountain lake. Aiguilles Rouges Reserve, Alps, France, July.