Fishmongers John Arkle and Paul Greenslade work at a fish stall outside a butcher's shop on the Fulham Road, in Fulham, London, Britain May 6, 2021. REUTERS/Kevin Coombs

Fishmongers John Arkle and Paul Greenslade work at a fish stall outside a butcher's shop on the Fulham Road, in Fulham, London, Britain May 6, 2021. REUTERS/Kevin Coombs

Fishmonger John Arkle works at a fish stall outside a butcher's shop on the Fulham Road, in Fulham, London, Britain May 6, 2021. REUTERS/Kevin Coombs

Fishmongers John Arkle and Paul Greenslade work at a fish stall outside a butcher's shop on the Fulham Road, in Fulham, London, Britain May 6, 2021. REUTERS/Kevin Coombs

Fishmongers John Arkle and Paul Greenslade work at a fish stall outside a butcher's shop on the Fulham Road, in Fulham, London, Britain May 6, 2021. REUTERS/Kevin Coombs

People queue at a fishmonger business in a market, amid the outbreak of the coronavirus disease (COVID-19), in Buckingham, Britain, February 23, 2021. REUTERS/Andrew Boyers

A fishmonger works at a small market, amid the outbreak of the coronavirus disease (COVID-19), in Buckingham, Britain, February 23, 2021. REUTERS/Andrew Boyers

A fishmonger works at a small market, amid the outbreak of the coronavirus disease (COVID-19), in Buckingham, Britain, February 23, 2021. REUTERS/Andrew Boyers

Fishmongers, wearing protective face masks, work at a local market in Nice amid the coronavirus disease (COVID-19) outbreak in France, February 18, 2021. REUTERS/Eric Gaillard

A man, wearing a protective face mask, shops at a fishmonger at a local market in Nice amid the coronavirus disease (COVID-19) outbreak in France, February 18, 2021. REUTERS/Eric Gaillard

A fishmonger wears a protective face mask in the main fish market, amid the spread of the coronavirus disease (COVID-19), in Athens, Greece, November 6, 2020. REUTERS/Louiza Vradi

Women wearing protective masks queue at a fishmonger stall in La Cebada market amid the coronavirus disease (COVID-19) outbreak, in Madrid, Spain, November 5, 2020. REUTERS/Sergio Perez

A tuna fishmonger Kimio Amano, 46, prepares a sliced fresh tuna at a wholesalers' area, amid the coronavirus disease (COVID-19) outbreak, at Toyosu market in Tokyo, Japan August 25, 2020. Picture taken August 25, 2020. REUTERS/Issei Kato

A tuna fishmonger Kimio Amano, 46, talks with his client at a wholesalers' area, amid the coronavirus disease (COVID-19) outbreak, at Toyosu market in Tokyo, Japan August 25, 2020. Picture taken August 25, 2020. REUTERS/Issei Kato

Tuna fishmongers prepare sliced raw tuna for their clients at a wholesalers' area, amid the coronavirus disease (COVID-19) outbreak, at Toyosu market in Tokyo, Japan August 25, 2020. Picture taken August 25, 2020. REUTERS/Issei Kato

A tuna fishmonger Kimio Amano, 46, waits for clients at his shop at a wholesalers' area, amid the coronavirus disease (COVID-19) outbreak, at Toyosu market in Tokyo, Japan August 25, 2020. Picture taken August 25, 2020. REUTERS/Issei Kato

A fishmonger displays a cod in Oslo, Norway, on August 26, 2020. REUTERS/Gwladys Fouche

Employees of a fishmonger wear protective masks during the coronavirus disease (COVID-19) pandemic in Pontevedra, Spain, August 13, 2020. REUTERS/Miguel Vidal

A fishmonger holds a frozen fish at the Goxu Mbacc Dock, during the outbreak of the coronavirus disease (COVID-19), in Saint-Louis, Senegal May 16, 2020. Picture taken May 16, 2020. REUTERS/Christophe Van Der Perre

A man reacts as a health official uses a swab to collect a sample at a fish market during the curfew amid concerns about the spread of the coronavirus disease (COVID-19), in Colombo, Sri Lanka, April 22, 2020. REUTERS/Dinuka Liyanawatte

A fishmonger poses as he is surrounded by closed stalls in Northwich indoor market as the spread of the coronavirus disease (COVID-19) continues, Britain, March 24, 2020. REUTERS/Molly Darlington

Lilian Atieno, a fishmonger, prepares fish at Dunga beach on the shores of Lake Victoria in Kisumu, Kenya March 18, 2020. Picture taken March 18, 2020. REUTERS/James Keyi

Fishmongers prepare fish at Dunga beach on the shores of Lake Victoria in Kisumu, Kenya March 18, 2020. Picture taken March 18, 2020. REUTERS/James Keyi

Fishmongers prepare fish at Dunga beach on the shores of Lake Victoria in Kisumu, Kenya March 18, 2020. Picture taken March 18, 2020. REUTERS/James Keyi

Lilian Atieno, a fishmonger, prepares fish at Dunga beach on the shores of Lake Victoria in Kisumu, Kenya March 18, 2020. Picture taken March 18, 2020. REUTERS/James Keyi

A woman shops at a fishmonger at the Bastille Market in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) in France, March 19, 2020. The placard reads "Please keep the safety distance of one meter". REUTERS/Gonzalo Fuentes

A fishmonger wears a protective face mask in a main fish market in Athens, Greece, March 14, 2020. REUTERS/Alkis Konstantinidis

Aymeric Chrzan, head of the fishmongers union branch, poses in front of a trawler in the port of Boulogne-sur-Mer, France, January 29, 2020. Picture taken January 29, 2020. EU fishermen will lose the automatic right to fish in British waters once Britain leaves the European Union. REUTERS/Pascal Rossignol

TV crew seen working outside Fishmonger's Hall, at the scene of a stabbing on London Bridge, in London, Britain, December 2, 2019.

Forensic officers are seen working nearby Fishmonger's Hall, at the scene of a stabbing on London Bridge, in London, Britain, December 1, 2019. REUTERS/Toby Melville

Forensic officers are seen working nearby Fishmonger's Hall, at the scene of a stabbing on London Bridge, in London, Britain, December 1, 2019. REUTERS/Toby Melville

Forensic officers are seen working nearby Fishmonger's Hall, at the scene of a stabbing on London Bridge, in London, Britain, December 1, 2019. REUTERS/Toby Melville

Britain's Prime Minister Boris Johnson speaks with Britain's Northern Powerhouse Minister Jake Berry as they stop at a fishmongers during a visit to Doncaster Market, in Doncaster, Britain, September 13, 2019. Jon Super/Pool via REUTERS

Fishmongers work in a market downtown in Tunis, Tunisia, February 20, 2019. REUTERS/Zoubeir Souissi

A customer talks to an in store fishmonger at a Tesco supermarket near Liverpool, Britain, January 28, 2019. REUTERS/ Phil Noble

Fish used as bait lay at the seafront in Havana, Cuba November 9, 2018. Picture taken on November 9, 2018. REUTERS/Alexandre Meneghini

A fishmonger cleans fish at a fish market in La Libertad, El Salvador November 8, 2018. REUTERS/Jose Cabezas

Fish on display in a fish market at the Fisherman's Wharf in La Libertad, El Salvador November 8, 2018. REUTERS/Jose Cabezas

A fishmonger cleans a fish at the fish market at Fisherman's Wharf in La Libertad, El Salvador, November 8, 2018. REUTERS/Jose Cabezas

A fishmonger handles sea bass at the fish market in the fishing village of Marsaxlokk, Malta November 4, 2018. REUTERS/Darrin Zammit Lupi

A fishmonger slices a fish at the fish market in the fishing village of Marsaxlokk, Malta November 4, 2018. REUTERS/Darrin Zammit Lupi

A fishmonger cleans a sea bass at the fish market in the fishing village of Marsaxlokk, Malta November 4, 2018. REUTERS/Darrin Zammit Lupi

A fishmonger handles a spiny dogfish on a cutting board at the fish market in the fishing village of Marsaxlokk, Malta November 4, 2018. REUTERS/Darrin Zammit Lupi

A woman sells fishes at a seafood market in Ha Long Bay, Vietnam November 3, 2018. REUTERS/Kham

Fan shells are display for sale at a market in Lima, Peru November 2, 2018. REUTERS/Mariana Bazo

Fishes are pictured after being caught in Sidon, Lebanon November 2, 2018. REUTERS/Ali Hashisho

A fisherman cleans fish in Sidon, Lebanon November 2, 2018. REUTERS/Ali Hashisho

Sheri fish are displayed at a mini fish market in Dubai, United Arab Emirates November 2, 2018. REUTERS/Ahmed Jadallah

Sultan Ibrahim fish are displayed at a mini fish market in Dubai, United Arab Emirates November 2, 2018. REUTERS/Ahmed Jadallah

Sardines are displayed at a mini fish market in Dubai, United Arab Emirates November 2, 2018. REUTERS/Ahmed Jadallah

A fisherman collects sardines at a beach in Nam Dinh province, Vietnam November 2, 2018. REUTERS/Kham

A fishmonger arranges fish for sale at his stall at South Melbourne Market in Melbourne, Australia, November 2, 2018. REUTERS/ Phil Noble

A fishmonger holds up an octopus for sale at his stall at South Melbourne market in Melbourne, Australia, November 2, 2018. REUTERS/ Phil Noble

A Pike or brochet (Esox lucius) is pictured after its catch on Lac de Neuchatel in Portalban, Switzerland, November 1, 2018. REUTERS/Denis Balibouse

Scales are pictured on a pike or brochet (Esox lucius) after its catch on Lac de Neuchatel in Portalban, Switzerland, November 1, 2018. REUTERS/Denis Balibouse

Heads of Bondelle (Coregonus candidus) fishes are pictured after their catch on Lac de Neuchatel in Portalban, Switzerland, November 1, 2018. REUTERS/Denis Balibouse

Bondelle (Coregonus candidus) fishes are pictured after their catch on Lac de Neuchatel near Portalban, Switzerland, November 1, 2018. REUTERS/Denis Balibouse

Perche (Perca fluviatilis) fishes are pictured after their catch on Lac de Neuchatel near Portalban, Switzerland, November 1, 2018. REUTERS/Denis Balibouse

Fillets of Bondelle (Coregonus candidus) fishes are pictured after their catch on Lac de Neuchatel in Portalban, Switzerland, November 1, 2018. REUTERS/Denis Balibouse

Perche (Perca fluviatilis) fishes are pictured after their catch on Lac de Neuchatel near Portalban, Switzerland, November 1, 2018. REUTERS/Denis Balibouse