Why is Canned Fish in the Fridge in Swedish Stores?

Well at least in the store next to the hotel I stayed in. Jars of pickled herring too. As well as the notorious fermented herring. By Australian standards, prices of food etc. mostly seem fairly reasonable in Sweden. And in Switzerland. I remember when I first went to Switzerland 24 years ago I was shocked by the high prices. Some things are cheaper than Australia and some more expensive. Beer in bars is expensive I'm told. But the price of wine in the System Bolaget store is very reasonable. Of course, by French standards it's expensive. It's the only place to buy wine, liquor, and beer stronger than 3.5% alcohol except in a bar and from 3pm on Saturday to Monday morning it's closed. The queues at 2:30pm on Saturday before they close at 3pm are nuts. They need a security guard to control the crowd queued up outside the store and winding all throughout it....