Concept:Fish preservation aims to prevent spoilage by removing moisture, adding preservatives, or using heat.
Explanation:Drying removes water from fish, making the environment unsuitable for bacteria.
Smoking uses heat and antimicrobial substances in smoke to preserve the fish.
Salting draws moisture out of fish through osmosis, inhibiting microbial growth.
Soaking, however, adds water to fish and creates moist conditions that encourage spoilage.
Therefore, soaking cannot be considered a method of fish preservation.
Answer:D. soaking