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Depuration (seafood)
Depuration of seafood is the process by which marine or freshwater animals are placed into a clean water environment for a period of time to allow purging of impurities. Most research and publications focus primarily on the depuration of seafood rather than freshwater animals. The commonly defined depuration process has been practiced since the 1800s originating as a method to prevent typhoid fever (via salmonella typhi) and other illnesses attributed to polluted shellfish being consumed.〔1. Belding and Lane 1909, A Report Upon the Mollusk Fisheries of Massachusetts. Wright & Potter, Boston〕 As coastal seawater became increasingly contaminated with sewage-borne bacteria, early research investigated the use of disgorging tanks.〔2. Herdman and Boyce 1899, Oysters and disease. Lancashire Sea Fisheries Memoir No.1 London〕 Today, modern seafood depuration is performed in segregated physical tanks using treated seawater that is sterilised either by way of chlorine, ultraviolet, or ozone.
Seafood Depuration is legislated or regulated in many countries including: France, United States, Japan, Ireland, Italy etc. Oversight is managed by internationally recognised agencies, for example, in the United States, the National Shellfish Sanitation Program (NSSP) sets guidelines on depuration and is recognised by the U.S. Food and Drug Administration. In Canada, the Canadian Food Inspection Agency (CFIA), Fisheries and Oceans Canada (DFO) and Environment Canada (EC) actively compile the manual for the Canadian Shellfish Sanitation Program (CSSP). The Codex Alimentarius, which is overseen by the World Health Organization (WHO) and Food and Agriculture Organisation of the United Nations (FAO), both recognises and encourages the application of seafood depuration.〔3. Code of Practice for fish and fishery products (first edition) Rome 2009. WHO and FAO ISBN 978-92-5-105914-2〕
According to the FAO in December 2006, France had 1422 depuration facilities, Italy had 144, Japan had over 1,000 facilities etc.〔4. Bivalve Depuration: fundamental and practical aspects. FAO Fisheries Technical paper. No 511. Rome FAO 2008.〕 The long history of the depuration process which expands across many countries and is recognised by international agencies is contrasted by the scarce or nonexistent data in the commercial space of the seafood industry. In a majority formal research, publications and governmental regulations, depuration is approached in the form of "public protection" and not in the form of "public awareness". One research study attempts to link the benefits of consumer awareness of shellfish depuration and found that surveyed restaurants were reluctant to sell depurated seafood. Whereas in the same study, consumers surveyed indicated they were prepared to pay a premium for depurated oysters. However, the willingness to pay a premium was expressed after the consumer was informed about depuration and depurated seafood indicating the average consumer was unaware about the depuration process.〔5. Exploring the Supply of Safer Foods: A case Study of Oyster Depuration in Dixie and Levy counties Florida, 1996 by Food Marketing Policy Center, University of Connecticut〕
==References==
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