Why was fish cut open at supermarket?

Why was fish cut open at supermarket? - Open envelope with heart made of colored carton

I bought some whole mackerel at the supermarket yesterday and I found when I opened the package that the fish had had their belly cut open but they had not been cleaned. Obviously it is really bad to do that because bacteria and parasites that exist in the intestines of the fish can contaminate any surface that is exposed to that mess. In fact two small worms had actually crawled out and were on the outside of the fish.

Why would the supermarket do that?






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Secrets of supermarket meat and fish: Testing the food you buy (CBC Marketplace)




Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Karolina Grabowska, Rachel Claire, Kelly L, Sam Lion