This is perfectly normal and, as long as there are no leaks, they are safe to eat from. Traditionally "enjoyed" with potatoes, onion and sourcream on swedish flatbread. Herring, water & salt.
The product "Traditional Swedish SURSTROMMING Sweden Smelly Stink Fish Can Prank Fermented" would be a great fit for gift ideas for people who enjoy amusing or unconventional gifts, particularly for those with a playful or humorous sense of humor.
