How would merfolk store and preserve their food?

I've been reading this question about agriculture for merfolk and more specifically the accepted answer. They mention the problem of food preservation only minutely. Now I'd like to pour that thought into a question proper: How would an aquatic species store and preserve food? Let's assume that the main food sources are fish, followed by kelp/seaweeds and shellfish.

Some ideas I had myself, but they don't touch on storage or may have flaws I'm missing:

• As the comments on the linked question discuss: somehow cure the meats using heat vents. Perhaps use air bubbles to keep dry?
• Do as some prehistoric gatherers did: simply store meats in a location with a very cool flow of water which supposedly slows down decay.

posted about 8 years ago

D-zap‭

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