Michel Roggo / Brown bear (Ursus arctos) head underwater fishing for sockeye salmon in the Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) head underwater while fishing for sockeye salmon in the Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) with its head underwater whilst fishing for sockeye salmon in the Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia

Michel Roggo / Brown bear (Ursus arctos) fishing for Sockeye salmon (Oncorhynchus nerka) in the Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) fishing for Sockeye salmon (Oncorhynchus nerka) in the Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) fishing for Sockeye salmon (Oncorhynchus nerka) in the Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) fishing for Sockeye salmon (Oncorhynchus nerka) in the Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) fishing for Sockeye salmon (Oncorhynchus nerka) in the Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) fishing for Sockeye salmon (Oncorhynchus nerka) in the Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) fishing for Sockeye salmon (Oncorhynchus nerka) in the Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) holding Sockeye salmon caught in Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) seen from underwater, fishing for Sockeye salmon, Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) seen from underwater, catching Sockeye salmon in the Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) seen from underwater, fishing for Sockeye salmon, Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Sockeye salmon (Oncorhynchus nerka) with Brown bear (Ursus arctos) fishing in the distance, underwater, Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) seen from underwater, fishing for Sockeye salmon, Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) seen from underwater, fishing for Sockeye salmon (Oncorhynchus nerka) in the Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) seen from underwater, fishing for Sockeye salmon, Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) seen from underwater, fishing for Sockeye salmon, Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) breathing out underwater, fishing for Sockeye salmon, Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) seen from underwater whilst fishing for Sockeye salmon, Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) seen from underwater, fishing for Sockeye salmon, Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) paws, seen from underwater, fishing for Sockeye salmon, Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

SCOTLAND: The Big Picture / Otters (Lutra lutra) fishing in the no take zone, Lamlash Bay, Isle of Arran, South Arran Marine Protected Area, Scotland, UK, August.

Michel Roggo / Brown bear (Ursus arctos) seen from underwater, fishing for Sockeye salmon, Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Michel Roggo / Brown bear (Ursus arctos) paws, seen underwater, fishing for Sockeye salmon, Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Nick Upton / Anna Carey fishing under license with a legally sized dip net for young European eel (Anguilla anguilla) elvers, or glass eels, on a rising tide on the River Parrett at night, Somerset, UK, March 201...

Nick Upton / Anna Carey fishing under license, casting a legally sized dip net for young European eel (Anguilla anguilla) elvers, or glass eels, on a rising tide on the River Parrett at dusk, UK, March 2016

Nick Upton / Young European eel (Anguilla anguilla) elvers, or glass eels retained in a collecting bucket with a fine mesh base during a fishing session on the River Parrett at night, caught under licence Somerset...

Danny Green / Grizzly bear (Ursus arctos) fishing in the rapids, Brooks falls in Katmai National Park, Alaska, July

Daniel Heuclin / Sumatran fisherman fishing with a cast net, Sumatra. July 2016.

Daniel Heuclin / Sumatran fisherman fishing with a cast net, Sumatra. July 2016.

Daniel Heuclin / Sumatran fisherman fishing with a dip net, Sumatra. July 2016.

SCOTLAND: The Big Picture / Spey Fishery Board biologists electrofishing on the river Dulnain to survey Atlantic salmon (Salmo salar) fry and parr, Cairngorms National Park, Scotland, UK, September 2015.

SCOTLAND: The Big Picture / Spey Fishery Board biologists electrofishing on the river Dulnain to survey Atlantic salmon (Salmo salar) fry and parr, Cairngorms National Park, Scotland, UK, September 2015.

SCOTLAND: The Big Picture / Spey Fishery Board biologists electrofishing on the river Dulnain to survey Atlantic salmon (Salmo salar) fry and parr, Cairngorms National Park, Scotland, UK, September 2015.

SCOTLAND: The Big Picture / Spey Fishery Board biologists electrofishing on the river Dulnain to survey Atlantic salmon (Salmo salar) fry and parr, Cairngorms National Park, Scotland, UK, September 2015.

SCOTLAND: The Big Picture / Spey Fisheries Board biologist releasing Atlantic salmon (Salmo salar) fry back into the river Dulnain after catching them for annual counts and measurements, Cairngorms National Park, Scotland, UK, S...

Terry Whittaker / Barbel (Barbus barbs) caught by angler and being released from urban river, Greater Manchester, UK May

Cyril Ruoso / Fishermen pulling in catch from Congo river, the border between Congo Brazzaville and Democratic Republic of Congo (DRC)

Juergen Freund / Fishing bats (Myotis macropus) hunting over river at night, Davis Creek, Queensland, Australia, November 2014.

Nick Turner / Corporate volunteers from Thames Water conducting a river bidodiversity survey on River Windrush at Brassey GWT Nature Reserve, Gloucestershire, UK. August 2015.

Nick Turner / Corporate volunteers from Thames Water conducting a river bidodiversity survey on River Windrush at Brassey GWT Nature Reserve, Gloucestershire, UK. August 2015.

Nick Turner / Will Masefield of Gloucestershire Wildlife Trust taking samples for survey of biodiversity on River Windrush, GWT Brassey Nature Reserve, Gloucestershire, UK. August 2015.

Nick Turner / Will Masefield of Gloucestershire Wildlife Trust taking samples for survey of biodiversity on River Windrush, GWT Brassey Nature Reserve, Gloucestershire, UK. August 2015.

Andy Rouse / Kingfisher (Alcedo atthis) perched on Private Fishing sign, UK, January.

Nick Upton / Young European eel (Anguilla anguilla) elver, or glass eel, about to pass through a coarse sieve in a collecting bucket alongside by-catch of amphipods (Gammarus sp.) retained for return to the river,...

Nick Upton / Anna Carey fishing under license with a legally sized dip net for young European eel (Anguilla anguilla) elvers, or glass eels, on a rising tide on the River Parrett at dusk, Somerset, UK, March.

Nick Upton / Anna Carey fishing under license with a legally sized dip net for young European eel (Anguilla anguilla) elvers, or glass eels, on a rising tide on the River Parrett at night, Somerset, UK, March.

Nick Upton / European eel (Anguilla anguilla) elvers, or glass eels, caught on a rising tide on the River Parrett at night, held in a collecting tray at the end of a fishing session, Somerset, UK, March.

Nick Upton / Young European eel (Anguilla anguilla) elvers, or glass eels, being poured from a legally sized dip net into a collecting bucket on a rising tide on the River Parrett at night, Somerset, UK, March.

Nick Upton / Anna Carey fishing under license with a legally sized dip net for young European eel (Anguilla anguilla) elvers, or glass eels, on a rising tide on the River Parrett at night, Somerset, UK, March.

Nick Upton / Anna Carey fishing under license with a legally sized dip net for young European eel (Anguilla anguilla) elvers, or glass eels, on a rising tide on the River Parrett at dusk, with several fishermen in...

Nick Upton / Anna Carey pouring her catch from a collecting bucket into a tray after fishing under license for young European eel (Anguilla anguilla) elvers, or glass eels, on a rising tide on the River Parrett at...

Nick Upton / Young European eel (Anguilla anguilla) elvers, or glass eels retained in a collecting bucket with a fine mesh base during a fishing session on the River Parrett at night, Somerset, UK, March.

Nick Upton / Young European eel (Anguilla anguilla) elvers, or glass eels on a coarse sieve in a collecting bucket during a fishhing session on the River Parrett at night, Somerset, UK, March.

Nick Upton / Young European eel (Anguilla anguilla) elvers, or glass eels, being poured from a legally sized dip net into a collecting bucket on a rising tide on the River Parrett at night, Somerset, UK, March.

Nick Upton / Anna Carey approaching the River Parrett to fish under license with a legally sized dip net for young European eel (Anguilla anguilla) elvers, or glass eels, on a rising tide at dusk, Somerset, UK, M...

Nick Upton / Anna Carey fishing under license with a legally sized dip net for young European eel (Anguilla anguilla) elvers, or glass eels, on a rising tide on the River Parrett at night, pouring her catch into a...

Nick Upton / Anna Carey fishing under license with a legally sized dip net for young European eel (Anguilla anguilla) elvers, or glass eels, on a rising tide on the River Parrett at dusk, pouring her catch into a...

Graham Eaton / Underwater view of child fishing for minnows (Phoxinus phoxinus) with a jam jar, River Glaslyn, Beddgelert, Wales. July 2015

Graham Eaton / Underwater view of a child fishing for minnows (Phoxinus phoxinus) with a jam jar, River Glaslyn, Beddgelert, Wales. July 2015

Loic Poidevin / Grizzly bear (Ursus arctos horribilis) fishing for salmon prey, Katmai, Alaska, USA , August.

Loic Poidevin / Grizzly bear (Ursus arctos horribilis) fishing for salmon, Katmai National Park, Alaska, USA, August

Loic Poidevin / Grizzly bear (Ursus arctos horribilis) fishing for salmon, Katmai National Park, Alaska, USA, August

Loic Poidevin / Grizzly bear (Ursus arctos horribilis) fishing for salmon, Katmai National Park, Alaska, USA, August

Loic Poidevin / Grizzly bear (Ursus arctos horribilis) fishing for salmon, Katmai National Park, Alaska, USA, August

Loic Poidevin / Grizzly bear (Ursus arctos horribilis) fishing for salmon, Katmai National Park, Alaska, USA, August.

Jeff Rotman / Family fishing for Sockeye salmon (Oncorhynchus nerka) Graveyard Point, Bristol Bay, Alaska, USA, June. Model released.

Jeff Rotman / Sockeye salmon (Oncorhynchus nerka) caught with set gill net. Graveyard Point, Bristol Bay, Alaska, USA, June. Model released.

Jeff Rotman / Fishermen hauling in set gill net to harvest Sockeye salmon (Oncorhynchus nerka) Graveyard Point, Bristol Bay, Alaska, USA. July 2015. Model released.

Jeff Rotman / Fishermen hauling in set gill net to harvest Sockeye salmon (Oncorhynchus nerka) Graveyard Point, Bristol Bay, Alaska, USA. July 2015. Model released.

Jeff Rotman / Fishermen hauling in Sockeye salmon (Oncorhynchus nerka) in gill net onto boat, Naknek River, Bristol Bay, Alaska, USA, July 2015.

Jeff Rotman / Fishermen haul in set gill net whilst fishing from Sockeye salmon (Oncorhynchus nerka) at night, Graveyard Point, Bristol Bay, Alaska, USA, July 2015. Model released.

Jeff Rotman / Fishermen haul in set gill net whilst fishing forSockeye salmon (Oncorhynchus nerka) at night, Graveyard Point, Bristol Bay, Alaska, USA, July 2015. Model released.

Jeff Rotman / Fishermen haul in set gill net whilst fishing for Sockeye salmon (Oncorhynchus nerka) at night, Graveyard Point, Bristol Bay, Alaska, USA, July 2015. Model released.

Jeff Rotman / Biologists from Alaska Fish and Game catch and sample returning Sockeye salmon (Oncorhynchus nerka) Naknek River, Bristol Bay, Alaska, USA, July 2015.

Jeff Rotman / Biologists from Alaska Fish and Game catch and sample returning sockeye salmon. Naknek River, Bristol Bay, Alaska.

Jeff Rotman / Sockeye salmon (Oncorhynchus nerka) hauled into boat from net, Bristol Bay, Alaska, USA, July 2015

Jeff Rotman / Young fisherman holding Sockeye salmon (Oncorhynchus nerka) caught using family subsistence license for gill net from shore. Naknek, Bristol Bay, Alaska, USA, June 2015.

Jeff Rotman / The MegJ preparing to drop drift gill net to catch Sockeye salmon (Oncorhynchus nerka) Naknek River, Bristol Bay, Alaska, USA, June 2015.

Jeff Rotman / Biologists from Alaska Fish and Game catching and sample returning Sockeye salmon (Oncorhynchus nerka) Naknek River, Bristol Bay, Alaska, USA, July.

Jeff Rotman / Man with load of Sockeye salmon (Oncorhynchus nerka) loaded directly from tender into factory for processing. This load of fish is in water mixed with blood. Naknek, Bristol Bay, Alaska, USA, July 201...

Jeff Rotman / Sockeye salmon (Oncorhynchus nerka) loaded directly from tender into factory for processing. This load of fish is in water mixed with blood. Naknek, Bristol Bay, Alaska, USA, July 2015.

Jeff Rotman / Commercial fishing boats getting ready to drop net to fish for Sockeye salmon (Oncorhynchus nerka) Naknek River, Bristol Bay, Alaska, USA, July.

Jeff Rotman / Fishermen dropping the net for Sockeye salmon (Oncorhynchus nerka) and trying to outmanoeuvre another boat. Naknek River, Bristol Bay, Alaska, USA, July 2015. Model released.

Jeff Rotman / Fisherman bleeding Sockeye salmon (Oncorhynchus nerka) before placing it in cold storage. Naknek River, Bristol Bay, Alaska, USA, July 2015. Model released.

Jeff Rotman / Fishing boat dropping the net for Sockeye salmon (Oncorhynchus nerka) and trying to outmanoeuvre other boats. Naknek River, Bristol Bay, Alaska, USA, July 2015.

Jeff Rotman / Fisherman bleeding Sockeye salmon (Oncorhynchus nerka) before placing it in cold storage. Naknek River, Bristol Bay, Alaska, USA, July 2015. Model released.

Jeff Rotman / Large number of fishing boats fishing for Sockeye salmon (Oncorhynchus nerka) using drift gill nets, and trying to out manoeuvre other boats. Naknek River, Bristol Bay, Alaska, USA, July.

Jeff Rotman / Fishing boat fishing for Sockeye salmon (Oncorhynchus nerka) using drift gill nets. Naknek River, Bristol Bay, Alaska, USA, July.

Jeff Rotman / Large number of fishing boats fishing for Sockeye salmon (Oncorhynchus nerka) using drift gill nets, and trying to out manoeuvre other boats. Naknek River, Bristol Bay, Alaska, USA, July.

Jeff Rotman / Fishing boat fishing for Sockeye salmon (Oncorhynchus nerka) using drift gill nets. Naknek River, Bristol Bay, Alaska, USA, July.

Jeff Rotman / Fishing boat fishing for Sockeye salmon (Oncorhynchus nerka) using drift gill nets. Naknek River, Bristol Bay, Alaska, USA, July.

Jeff Rotman / Fish processing boat during Sockeye salmon (Oncorhynchus nerka) spawning run, Naknek River, Bristol Bay, Alaska, USA, July 2015.

Jeff Rotman / Set gill net fishing for Sockeye salmon (Oncorhynchus nerka) from the coast, Graveyard Point, Bristol Bay, Alaska, USA, July 2015.