Fishermen set out to begin the traditional carp haul near the village of Belcice, Czech Republic, October 25, 2016. REUTERS/David W Cerny 

Fishermen pull a net containing fish from a pond during the traditional carp haul near the village of Belcice, Czech Republic, October 25, 2016. REUTERS/David W Cerny 

Fishermen pull a net containing fish from a pond during the traditional carp haul near the village of Belcice, Czech Republic, October 25, 2016. REUTERS/David W Cerny 

A fish struggles in a net after being caught by fishermen during the traditional carp haul near the village of Belcice, Czech Republic, October 25, 2016. REUTERS/David W Cerny 

Fishermen pull a net containing fish from a pond during the traditional carp haul near the village of Belcice, Czech Republic, October 25, 2016. REUTERS/David W Cerny TPX IMAGES OF THE DAY

Fishermen set out to begin the traditional carp haul near the village of Belcice, Czech Republic, October 25, 2016. REUTERS/David W Cerny 

Catfish gather in the corner of the Gundalao lake as they wait to be fed by passersby in Kishangarh, Rajasthan, India, October 07, 2016. REUTERS/Himanshu Sharma 

Catfish gather in the corner of the Gundalao lake as they wait to be fed by passersby in Kishangarh, Rajasthan, India, October 07, 2016. REUTERS/Himanshu Sharma 

Stanley Ferdinand filets large trout he caught in Great Bear Lake in Deline, Northwest Territories, Canada September 8, 2016. REUTERS/Pat Kane TPX IMAGES OF THE DAY SEARCH "DELINE KANE" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES. 

Floating ponds containing salmon are seen at a salmon hatchery near Puerto Montt, Chile June 29, 2016. Picture taken June 29, 2016. REUTERS/Anthony Esposito 

Food pellets are seen at floating ponds containing salmon at a salmon hatchery near Puerto Montt, Chile June 29, 2016. Picture taken June 29, 2016. REUTERS/Anthony Esposito 

Floating ponds containing salmon at a salmon hatchery are seen near Puerto Montt, Chile June 29, 2016. Picture taken June 29, 2016. REUTERS/Anthony Esposito 

A tank containing salmon is seen at a salmon hatchery near Puerto Montt, Chile June 29, 2016. Picture taken June 29, 2016. REUTERS/Anthony Esposito 

A container of scaled sardines caught by a “sulfuric fire fishing" boat are seen in New Taipei City, Taiwan June 19, 2016. REUTERS/Tyrone Siu SEARCH "FIRE FISHING" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES.

Fishermen unload scaled sardines from a traditional “sulfuric fire fishing" boat in New Taipei City, Taiwan June 19, 2016. REUTERS/Tyrone Siu SEARCH "FIRE FISHING" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES.

Workers load scaled sardines onto a lorry in New Taipei City, Taiwan June 19, 2016. REUTERS/Tyrone Siu SEARCH "FIRE FISHING" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES.

A fisherman prepares ice for transporting scaled sardines caught on a traditional “sulfuric fire fishing" boat in New Taipei City, Taiwan June 19, 2016. REUTERS/Tyrone Siu SEARCH "FIRE FISHING" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES.

A carp swims in the Chidorigafuchi moat covered with petals of cherry blossoms in Tokyo, Japan April 8, 2016. REUTERS/Toru Hanai TPX IMAGES OF THE DAY

A carp swims in the Chidorigafuchi moat covered with petals of cherry blossoms in Tokyo, Japan April 8, 2016. REUTERS/Toru Hanai TPX IMAGES OF THE DAY

A dog sits next to a migrant eating canned tuna and bread while waiting for a train to depart to Croatia at train station in Presevo, Serbia, January 19, 2016. REUTERS/Marko Djurica TPX IMAGES OF THE DAY

People fish for trout through holes in a frozen river in Hwacheon, south of the demilitarized zone (DMZ) separating the two Koreas, January 9, 2016. REUTERS/Kim Hong-Ji TPX IMAGES OF THE DAY

A worker prepares to weigh a carp caught during the draining of the Canal Saint-Martin in Paris, France, January 5, 2016. Authorities start a three-month cleanup operation of the canal St-Martin, in north-eastern Paris, in an attempt to refurbish its locks and remove rubbish. REUTERS/Charles Platiau 

A wholesaler carries a frozen tuna after the New Year's auction at the Tsukiji fish market in Tokyo, Japan, January 5, 2016. REUTERS/Toru Hanai

A wholesaler carries a frozen tuna after the New Year's auction at the Tsukiji fish market in Tokyo, Japan, January 5, 2016. REUTERS/Toru Hanai

Wholesalers claps their hands before the New Year's auction for fresh tuna at the Tsukiji fish market in Tokyo, Japan, January 5, 2016. REUTERS/Toru Hanai

A wholesaler walks past a head of frozen tuna after the New Year's auction at the Tsukiji fish market in Tokyo, Japan, January 5, 2016. REUTERS/Toru Hanai

A wholesaler checks the quality of frozen tuna displayed at the Tsukiji fish market before the New Year's auction in Tokyo, Japan, January 5, 2016. REUTERS/Toru Hanai

Wholesalers carry frozen tuna after the New Year's auction at the Tsukiji fish market in Tokyo, Japan, January 5, 2016. REUTERS/Toru Hanai

A wholesaler checks the quality of a fresh tuna displayed at the Tsukiji fish market before the New Year's auction in Tokyo, Japan, January 5, 2016. REUTERS/Toru Hanai

A wholesaler checks the quality of frozen tuna displayed at the Tsukiji fish market before the New Year's auction in Tokyo, Japan, January 5, 2016. REUTERS/Toru Hanai

Kiyomura Co's President Kiyoshi Kimura (C), who runs a chain of sushi restaurants, holds a sword as he poses with a 200 kg (400 lbs) bluefin tuna at his sushi restaurant outside Tsukiji fish market in Tokyo, Japan, January 5, 2016. Kimura won the bid for the tuna caught off Oma, Aomori prefecture, northern Japan, with a 14 million yen (117,000 USD) at the fish market's first tuna auction this year. REUTERS/Toru Hanai

Kiyomura Co's employees push a cart carrying a 200 kg (400 lbs) bluefin tuna at the company's sushi restaurant outside Tsukiji fish market in Tokyo, Japan, January 5, 2016. Kiyomura Co won the bid for the tuna caught off Oma, Aomori prefecture, northern Japan, with a 14 million yen (117,000 USD) at the fish market's first tuna auction this year. REUTERS/Toru Hanai

Kiyomura Co's President Kiyoshi Kimura (C), who runs a chain of sushi restaurants, holds a sword as he poses with a 200 kg (400 lbs) bluefin tuna at his sushi restaurant outside Tsukiji fish market in Tokyo, Japan, January 5, 2016. Kimura won the bid for the tuna caught off Oma, Aomori prefecture, northern Japan, with a 14 million yen (117,000 USD) at the fish market's first tuna auction this year. REUTERS/Toru Hanai

Kiyomura Co's President Kiyoshi Kimura (C), who runs a chain of sushi restaurants, holds a sword as he poses with a 200 kg (400 lbs) bluefin tuna at his sushi restaurant outside Tsukiji fish market in Tokyo, Japan, January 5, 2016. Kimura won the bid for the tuna caught off Oma, Aomori prefecture, northern Japan, with a 14 million yen (117,000 USD) at the fish market's first tuna auction this year. REUTERS/Toru Hanai TPX IMAGES OF THE DAY

A wholesaler checks the quality of a fresh tuna displayed at the Tsukiji fish market before the New Year's auction in Tokyo, Japan, January 5, 2016. REUTERS/Toru Hanai

Wholesalers check the quality of fresh tuna displayed at the Tsukiji fish market before the New Year's auction in Tokyo, Japan, January 5, 2016. REUTERS/Toru Hanai

A wholesaler checks the quality of a fresh tuna displayed at the Tsukiji fish market before the New Year's auction in Tokyo, Japan, January 5, 2016. REUTERS/Toru Hanai

Wholesalers check the quality of a fresh tuna displayed at the Tsukiji fish market before the New Year's auction in Tokyo, Japan, January 5, 2016. REUTERS/Toru Hanai

Wholesalers check the quality of fresh tuna displayed at the Tsukiji fish market before the New Year's auction in Tokyo, Japan, January 5, 2016. REUTERS/Toru Hanai TPX IMAGES OF THE DAY

A diver dressed in a Santa Claus costume swims with sardines during a promotional event for Christmas "Sardines Feeding Show with Santa Claus" at the Coex Aquarium in Seoul, South Korea, December 9, 2015. REUTERS/Kim Hong-Ji 

A diver dressed in a Santa Claus costume swims with sardines during a promotional event for Christmas "Sardines Feeding Show with Santa Claus" at the Coex Aquarium in Seoul, South Korea, December 9, 2015. REUTERS/Kim Hong-Ji TPX IMAGES OF THE DAY

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. A stranded migrant sleeps atop a structure with a slogan written by other migrants near the border between Greece and Macedonia, near the Greek village of Idomeni November 23, 2015. Moroccans, Iranians and Pakistanis on Greece’s northern border with Macedonia blocked rail traffic and demanded passage to western Europe on Monday, stranded by a policy of filtering migrants in the Balkans that has raised human rights concerns. REUTERS/Yannis Behrakis 

Fishermen prepare nets for a the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny

Fishermen prepare for a the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny

Fishermen prepare nets for the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny

A fisherman looks at fish during the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny

Fishermen pull a net containing fish from a pond during the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny

Seagulls take off froma pond during the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny

A fisherman stands on a boat during the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny 

Fishermen smoke cigarettes during the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny 

Fishermen prepare nets for a the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny 

A fisherman selects fish during the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny 

Seagulls fly over fishermen during the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny 

A fisherman sets out to begin the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny 

Seagulls take off above fishermen during the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny

A fisherman pulls a net in a pond during the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny

Fishermen pull a net containing fish from a pond during the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny

Fishermen sort fish during the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny

A fisherman throws a fish during the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny

A fisherman throws a fish during the traditional carp haul in the village of Smrzov, near the south Bohemian town of Trebon, Czech Republic, November 2, 2015. The annual carp harvest started in late October, ahead of the upcoming Christmas season. REUTERS/David W Cerny TPX IMAGES OF THE DAY