How did traditional smoking preserve fish?

Traditionally, smoking preserved fish through a combination of dehydration and the introduction of chemical compounds found in wood smoke.1

The process typically involved several key steps:

• Brining: Fish were soaked in a salt solution, which helped draw out moisture and prepare the flesh for preservation.1
• Drying: By partially drying the fish on racks, processors reduced the water activity, making the environment less hospitable to spoilage organisms.1
• Chemical Exposure: As the fish were exposed to smoke from smoldering wood or sawdust, natural chemical preservatives—such as formaldehyde and certain alcohols—were deposited onto the fish. These compounds acted as antimicrobial agents, further extending the shelf life of the product.2

While modern methods often prioritize flavor over preservation—resulting in products like kippered fish that require refrigeration—traditional smoking was a vital, multi-faceted food preservation technique that relied on the synergy between heat, dehydration, and chemical infusion.12