Workers process fillets of lemon sole at the Flatfish processing facility in Grimsby, Britain November 18, 2015. A family-owned business with an annual turnover of over 12 million pounds, Flatfish is a success story in Grimsby's buoyant fish processing sector. The European Union is not an abstract concept in Grimsby, an English port where many blame EU fishing quotas for destroying livelihoods, but views on whether Britain should quit the club are more nuanced than the decaying fish docks suggest. Photograph taken November 18, 2015. REUTERS/Phil Noble 

Flatfish are seen aboard the "Shoei Maru" fishing boat, close to Hirono town, about 25km south of Fukushima Daiichi nuclear power plant, Fukushima prefecture May 26, 2013. Operated by 80-year-old Shohei Yaoita and 71-year-old Tatsuo Niitsuma, the boat's catch will be used to test for radioactive contamination in the waters near the Fukushima Daiichi nuclear facility. Commercial fishing has been banned near the tsunami-crippled nuclear complex since the March 2011 tsunami and earthquake. The only fishing that still takes place is for contamination research, and is carried out by small-scale fishermen contracted by the government. REUTERS/Issei Kato (JAPAN - Tags: DISASTER BUSINESS ENVIRONMENT SOCIETY) 

Flatfish, stonefish, flounder, greenling and ray caught by the "Shoei Maru" fishing boat lie in boxes in Iwaki, Fukushima prefecture May 26, 2013. Operated by 80-year-old Shohei Yaoita and 71-year-old Tatsuo Niitsuma, the boat's catch will be used to test for radioactive contamination in the waters near the Fukushima Daiichi nuclear facility. Commercial fishing has been banned near the tsunami-crippled nuclear complex since the March 2011 tsunami and earthquake. The only fishing that still takes place is for contamination research, and is carried out by small-scale fishermen contracted by the government. Picture taken May 26, 2013. REUTERS/Issei Kato (JAPAN - Tags: DISASTER BUSINESS ENVIRONMENT SOCIETY)

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Flatfish are seen aboard the "Shoei Maru" fishing boat, close to Hirono town, about 25 km (16 miles) south of Fukushima Daiichi nuclear power plant, Fukushima prefecture May 26, 2013. Operated by 80-year-old Shohei Yaoita and 71-year-old Tatsuo Niitsuma, the boat's catch will be used to test for radioactive contamination in the waters near the Fukushima Daiichi nuclear facility. Commercial fishing has been banned near the tsunami-crippled nuclear complex since the March 2011 tsunami and earthquake. The only fishing that still takes place is for contamination research, and is carried out by small-scale fishermen contracted by the government. Picture taken May 26, 2013. REUTERS/Issei Kato (JAPAN - Tags: DISASTER BUSINESS ENVIRONMENT SOCIETY ANIMALS)

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A wholesaler holds a flatfish from Aomori prefecture as a shopper points at it, at the Tsukiji fish market in Tokyo March 22, 2011. The tsunami that hit Japan this month took such a huge toll on people, equipment and fish that supplies of some seafood could be cut off for a year or more, industry workers said on Tuesday. The magnitude 9.0 quake on March 11 and the 10-metre (30-foot) tsunami it triggered are known to have killed more than 9,000 people and more than 12,000 are still missing. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER BUSINESS FOOD) 

An angler flatfish blends itself against the black sandy bottom as it preys for food at Lembeh Strait, off the coast of North Sulawesi, Indonesia August 20, 2009. Its first dorsal fin has evolved into a "fishing lure" to attract smaller fish and octopuses. Note: The purple eyes are due to a strobe being used. REUTERS/David Loh (INDONESIA ANIMALS SOCIETY)