Bluefin tuna steaks are seen onboard a commercial fishing vessel in Tuna Harbor in San Diego, California, U.S., April 4, 2020 during an outbreak of the coronavirus disease (COVID-19). Picture taken April 4, 2020. REUTERS/Bing Guan 

The poisonous parts of pufferfish are placed in a bucket for disposal in Shimonoseki, Japan February 7, 2020. Picture taken on February 7, 2020. REUTERS/Sakura Murakami 

A pufferfish is set to be auctioned at an early morning fish auction in Shimonoseki, Japan February 7, 2020. Picture taken on February 7, 2020. REUTERS/Sakura Murakami 

The edible parts of a pufferfish are laid out by a licensed handler of a pufferfish wholesaler in Shimonoseki, Japan February 7, 2020. Picture taken on February 7, 2020. REUTERS/Sakura Murakami 

The poisonous organs of a pufferfish are cut out by a licensed handler at the kitchen of a pufferfish wholesaler in Shimonoseki, Japan February 7, 2020. Picture taken on February 7, 2020. REUTERS/Sakura Murakami 

The skin of a pufferfish is stuffed with rice husks to make a pufferfish decoration in Shimonoseki, Japan February 7, 2020. Picture taken on February 7, 2020. REUTERS/Sakura Murakami 

Pufferfish flail in a tub at an early morning auction in Shimonoseki, Japan February 7, 2020. Picture taken on February 7, 2020. REUTERS/Sakura Murakami 

Trout lies on a frozen river in Hwacheon, south of the demilitarized zone (DMZ) separating the two Koreas, South Korea, February 8, 2020. REUTERS/Heo Ran 

Policewomen march during the full dress rehearsal for the Republic Day parade in Chennai, India, January 23, 2020. REUTERS/P. Ravikumar 

A migrant eats canned tuna inside Vucjak camp near Bihac, Bosnia and Herzegovina, October 30, 2019. REUTERS/Marko Djurica SEARCH "BIHAC CAMP" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A dead trout floats inside a farm cage at a fish hatchery in Tiquina village, Lake Titicaca, Bolivia, May 08, 2019. REUTERS/Manuel Seoane SEARCH "TITICACA CLIMATE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Coral trout are seen inside Apollo Aquaculture Group's three-tiered vertical fish farm in northern Singapore, May 4, 2019. REUTERS/Loriene Perera 

REFILE - REMOVING MATERIAL A flip-flop is seen on the sand at Maccarese beach, west of Rome, Italy November 21, 2018. REUTERS/Max Rossi 

REFILE - REMOVING MATERIAL A shoe sole is seen on the sand at Maccarese beach, west of Rome, Italy November 21, 2018. REUTERS/Max Rossi 

Plastic bottles and a flip-flop lie on the sand at Maccarese beach in Rome, Italy, November 21, 2018. REUTERS/Max Rossi 

A plastic shoe platform lies on the sand at Maccarese beach in Rome, Italy, November 21, 2018. REUTERS/Max Rossi 

A flip-flop made of plastic is seen on the sand at Maccarese beach, west of Rome, Italy November 21, 2018. REUTERS/Max Rossi 

A shoe sole made out of plastic is seen on the sand at Maccarese beach, west of Rome, Italy November 21, 2018. REUTERS/Max Rossi 

A salmon leaps out of the water as swans fly overhead near Pitlochry boating station, Scotland, Britain November 1, 2018. REUTERS/Russell Cheyne 

A salmon leaps out of the water as swans fly overhead near Pitlochry boating station, Scotland, Britain November 1, 2018. REUTERS/Russell Cheyne 

Anchovies are seen after being removed from the boat at the port of Matosinhos in Portugal, May 29, 2018. Picture taken May 29, 2018. To match Special Report OCEANS-TIDE/SARDINES REUTERS/Pedro Nunes 

Fish are displayed for sale at the fish market in Joal-Fadiouth, Senegal, April 10, 2018. Picture taken April 10, 2018. To match Special Report OCEANS-TIDE/SARDINELLA REUTERS/Sylvain Cherkaoui 

Pieces of salmon are seen on a market in Nice, France October 28, 2018. REUTERS/Eric Gaillard 

Heads of fresh tuna fish lie on a table at the Tsukiji market in Tokyo, Japan, September 27, 2018. REUTERS/Issei Kato 

Canadian Atlantic salmon steaks are displayed for customers at St. Lawrence Market South in Toronto, Ontario, Canada September 27, 2018. REUTERS/Chris Helgren 

Wild sockeye salmon fillets are displayed for customers at St. Lawrence Market South in Toronto, Ontario, Canada September 27, 2018. REUTERS/Chris Helgren 

A freshly caught flounder fish lays in in the water during the Diawa Irish Pairs sea angling event in windy conditions on the Dingle Peninsula of Inch beach in Inch, Ireland, September 18, 2018. REUTERS/Clodagh Kilcoyne 

A seahorse rests on the seabed during a dive in the village of Stratoni near Chalkidiki, Greece, July 16, 2018. Picture taken July 16, 2018. REUTERS/Idyli Tsakiri 

A seahorse rests on the seabed during a dive in the village of Stratoni near Chalkidiki, Greece, July 16, 2018. Picture taken July 16, 2018. REUTERS/Idyli Tsakiri 

A seahorse is wrapped on a diver's finger during a dive in the village of Stratoni near Chalkidiki, Greece, July 16, 2018. Picture taken July 16, 2018. REUTERS/Idyli Tsakiri 

A seahorse rests on the seabed during a dive in the village of Stratoni near Chalkidiki, Greece, July 16, 2018. Picture taken July 16, 2018. REUTERS/Idyli Tsakiri 

A seahorse rests on the seabed during a dive in the village of Stratoni near Chalkidiki, Greece, July 16, 2018. Picture taken July 16, 2018. REUTERS/Idyli Tsakiri 

A seahorse is wrapped on a diver's finger during a dive in the village of Stratoni near Chalkidiki, Greece, July 16, 2018. Picture taken July 16, 2018. REUTERS/Idyli Tsakiri 

A fisherman reels in a catfish in the Okavango Delta, Botswana, April 24, 2018. Picture taken April 24, 2018. REUTERS/Mike Hutchings 

A grey mullet is shown next to microplastic found in Hong Kong waters during a Greenpeace news conference in Hong Kong, China, April 23, 2018. REUTERS/Bobby Yip 

A fisherman fills a bucket with freshly caught sardines in Naiguata, Venezuela April 7, 2018. REUTERS/Marco Bello 

A boy fills a bucket with freshly caught sardines in Naiguata, Venezuela April 7, 2018. REUTERS/Marco Bello 

Freshly caught sardines are seen in a net in Naiguata, Venezuela April 7, 2018. REUTERS/Marco Bello 

A mouth of a carp is seen at a pond covered with petals of cherry blossoms at a park in Tokyo, Japan, April 2, 2018. REUTERS/Toru Hanai 

People fish for trout on a frozen river during the Ice Festival in Hwacheon, south of the demilitarized zone (DMZ) separating the two Koreas, South Korea January 6, 2018. REUTERS/Kim Hong-Ji 

A swan crosses a street flooded by the river Moselle in Bernkastell-Kues, Germany, January 5, 2018. REUTERS/Wolfgang Rattay TPX IMAGES OF THE DAY 

Cattle graze around flood waters caused by Tropical Storm Harvey near Sandy Point, Texas, U.S. August 30, 2017. Picture taken August 30, 2017. REUTERS/Adrees Latif TPX IMAGES OF THE DAY 

Pieces of tuna fish on display at a fish market in Mexico City, Mexico May 18, 2017. REUTERS/Henry Romero 

A vendor holds a Mexican tuna at a fish market in Mexico City, Mexico April 25, 2017. REUTERS/Henry Romero 

Mexican tuna is on display at a fish market in Mexico City, Mexico April 25, 2017. REUTERS/Henry Romero 

Catfish are fed at a farm visited by a group of foreign reporters in Pyongyang, North Korea April 17, 2017. REUTERS/Damir Sagolj 

Catfish are fed at a farm visited by a group of foreign reporters in Pyongyang, North Korea April 17, 2017. REUTERS/Damir Sagolj 

Trout are laid on a frozen river in Hwacheon, south of the demilitarized zone (DMZ) separating the two Koreas, January 14, 2017. REUTERS/Kim Hong-Ji 

A worker holds a yellow fin tuna before selling it at Muara Baru fish market in Jakarta, Indonesia, December 27, 2016. Picture taken December 27, 2016. REUTERS/Beawiharta 

A trout is seen along the shore of the Laguna del Maule (Lagoon of Maule), in the VII region of Talca, south of Santiago, Chile November 29, 2016. REUTERS/Rodrigo Garrido 

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

Fish lie in a footprint during the traditional carp haul near the village of Belcice, Czech Republic, October 25, 2016. REUTERS/David W Cerny 

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

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

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

A fisherman looks at fish as he sits in a boat during the traditional carp haul near the village of Belcice, Czech Republic, October 25, 2016. REUTERS/David W Cerny 

A fish is thrown by a fisherman during the traditional carp haul near the village of Belcice, Czech Republic, October 25, 2016. REUTERS/David W Cerny 

Local residents wait under the sluice gate to catch fish during the traditional carp haul near the village of Belcice, Czech Republic, October 25, 2016. REUTERS/David W Cerny 

Fish are seen in 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