Frozen Fish

Today, around 5 per cent of the world's entire fish catch, by weight, is tuna and the global tuna business is worth around $5.5bn. All of the 23 identified, commercially exploited stocks are heavily fished; at least nine of these are classified as fully fished and a further four classified as overexploited or depleted. Three stocks are classified as 'critically endangered', three as 'endangered', and three as 'vulnerable to extinction'. The magnificent and iconic southern bluefin tuna has been reduced by some 95 per cent of stocks before 1950.  [Behind the Label: Tinned tuna]

For frozen foods, most of the energy is used in freezing the product and then keeping it at that temperature from the factory to the freezer section of the grocery store.