We love this feature on our website - look out for the Cornwall Good Seafood Guide RECOMMENDED icon when you shop for seafood with us. Just use the sustainability score next to the icon to determine how sustainable the species is. Scores of 1 (best), 2 and 3 are recommended as sustainable species. Using the same methodology as the Marine Conservation Society (MCS), the Cornwall Good Seafood Guide rates fish on a sustainability scale 1 (best) to 5 (worst). Scores of 1, 2 and 3 are recommended as sustainable. Read more about sustainability here