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Oysters need something to attach themselves to in order to grow, and the large surface areas of old toilets provide plenty of places to attach. The use of toilets is very appropriate, since oysters are micro water treatment systems. This makes it easy to pick up diseases such as hepatitis from eating oysters.
http://www.care2.com/causes/its-the-ultimate-recycling-old-nyc-toilets-become-new-oyster-beds-2.html

It's The Ultimate Recycling: Old NYC Toilets Become New Oyster Beds | Care2 CausesNew York City plans to revitalize long-dead oyster beds with the porcelain pieces of thousands of old toilets.