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Yesterday my grandmother ate fresh tuna at a friend's party. She swears it was fresh and bought at a local fish-shop. The problem is, that we live in Gdańsk, by the south-eastern side of the Baltic sea and I have never heard of tuna in the Baltic. I told her that the fish couldn't have been local and therefore couldn't have been fresh but frozen and thawed. But the thought still bothers me, maybe tuna fish can reach the Baltic?

I did search a bit and found that tuna may be sometimes found in the Northern sea, so maybe it actually can travel so far east as to reach the Baltic? But the water in the Batlic is hardly saltwater (6-8‰), so would it be able to survive?

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Indeed tuna are present in the Baltic sea, and they can also grow in the Pacific and Indian oceans. A lot of the tuna we see in tuna cans in supermarkets comes from the stocks in the Indian ocean, but it is possible to have fresh tuna from the Baltic.

Sorry, I only found a French answer from a famous French news paper:

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I know some french, so it's not a big problem. The problem is, that Le Figaro is quite far in the Science News Cycle (, so if it's the only link you can find, is very weak. I searched on ncbi and found nothing on tuna living in the Baltic sea, but I don't know how broad is their database - generally I used it when I was a biotechnology student plus for some medical research for my family - not much of ichtiology. – jkadlubowska Nov 5 '12 at 11:55

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