Tuna is a saltwater fish related to mackerel. There are around eight different commercial varieties that range in size from the small skipjack to the large bluefin – it’s one of the most eaten fish in the world.
The fish is a powerhouse of essential nutrients such as omega-3 fatty acids, potassium, magnesium, iron, vitamin A, B6 and B12, and as such is beneficial for health.
Tuna can be eaten fresh; either raw or cooked, and canned (which is always pre-cooked). Canned tuna in the UK can be bought in brine, spring water, sunflower or olive oil.
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