Please use the sharing tools found via the share button at the top or side of articles. Copying articles to share with others is a breach of FT.com T&Cs and Copyright Policy. Email licensing@ft.com to buy additional rights. Subscribers may share up to 10 or 20 articles per month using the gift article service. More information can be found at https://www.ft.com/tour. https://www.ft.com/content/e8d8a5e1-5121-493c-9bda-294cc9dbf089 In the week Cornwall took on the US in the space industry — with mixed results — ministers are looking to lure wealthy Americans to the county to exploit the return of bluefin tuna to UK waters after a 50-year absence.