EU referendum, brexit and the aftermath

I don't know but I think a lot if not most of our shellfish catch is frozen and shipped to China.

Shellfish sector facts

• The shellfish sector is the largest of the three fishing sectors in the UK, representing 36% of the value of fish landed into the UK and abroad by UK vessels, and 46% of the value of fish landed into the UK in 2016. The total value at first landing was estimated at £339m, with landings into the UK of £318m. These figures exclude value added through processing, packaging and marketing, and changes in values since 2016.
  
• The shellfish sector is dispersed around the coastline of the whole of the UK and is important economically and culturally to a large number of ports and coastal communities. At least 1933 vessels (41% of all active fishing vessels) fish for shellfish in the UK, supporting at least 4,313 full-time equivalent (FTE) jobs (54% of all FTEs involved in fishing). Shellfish are processed at 79 shellfish-only processing facilities and 55 mixed species processors, with shellfish-only sites accounting for an estimated 3,950 FTE jobs (29% of all FTE jobs in sea fish processing).
  
• Most UK shellfish is exported to the EU – live, fresh or chilled shellfish provides the highest value. Fresh, frozen and smoked shellfish exports in 2017 were valued at over £500m, with exports to the EU in the region of £432m (85%) and exports to the rest of the world in the region of £77m (15%). The UK also exported £39m of prepared shellfish to the EU. The UK market for UK shellfish, although highly valued by the fishing industry, is believed to be small in relation to the EU market for these same fish. The principal destinations of UK shellfish in the EU are France, Spain and Italy. Key rest of the world markets include China and South Korea.
  With very few exceptions, it is the trade in live, fresh or chilled shellfish with EU Member States which provided the highest value. For the most part, it would appear that UK shellfish exports to the EU are consumed within EU member states, rather than being further traded to other non-EU countries.
  
• The relevance of particular countries for UK shellfish exports varies by species; eg, brown crab (France, Spain and Portugal), velvet crab (Spain), lobster (France and Spain), Nephrops (France and Spain), cuttlefish (Spain, Italy and the Netherlands), scallops (France and Italy), clams (France, Spain, the Netherlands), and mussels (the Netherlands). France is the principal export market for crustaceans, followed by Spain, Portugal and Italy, while the Netherlands and, to a lesser extent, Spain and France are of particular relevance for molluscs, and Spain, Italy and the Netherlands are of relevance for cephalopods.
  
  

https://fishingnews.co.uk/news/brexit-shellfish-threat-no-deal-brexit-shellfish-warning/