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Kalvön (alt. Kalfön) was a late 18th century skerryworks, a type of fish factory built during the "Great Herring Period" of 1747–1809 where Atlantic herring (Clupea harengus) was both salted for human consumption and processed into train oil for chemical usage. The waste product from the oil production, trangrums, was used as a potent fertiliser. The ruins have been preserved, and are in accordance with the articles of the Cultural Heritage Law a legally protected archaeological site.

It is located on Stussholmen, a former islet now part of the wider Kalvön island.

History
The peninsula on which the archaeological site is located

Other than the factory, and several croft ruins from the 18th and 19th centuries, Kalvön shows signs of an older history, such as two identified Nordic Stone Age sites and a grave field from the Iron Age.

Since 1968, the island of Kalvön — the Stussholmen peninsula included — is a nature reserve, managed by Västkuststiftelsen ("the West Coast Foundation"). The ruins of the Kalvön skerryworks were rediscovered in July 2015, by an archaeologist working with the nature reserve managers following up on information provided by local residents, during a survey of the island. A subsequent May 2016 survey revealed further structures, previously hidden during high tide. In total, surviving surface structures include a stone waste reservoir (a grumsedamm), the stone and brick foundations of a small rectangular building, and remnants of a collapsed wharf.