Branding and business cards. The Cornish Shellfish Company has been famous for years for the production of extraordinary shellfish. Over the years, marine shellfish experts, culinary writers, and seafood lovers have proclaimed that shellfish and oysters from The Cornish Shellfish Company are the finest in the world.The Cornish Shellfish Company was founded to bring these world famous oysters to markets around the country including Harrods, The Mayfair and The London to name a few.