Beneficial Oyster

    Cleaning New York’s filthy harbor with one billion oysters – New York (CNN Business) – The New York Harbor for years has been polluted and depleted of marine life. But one nonprofit is working to clean the murky water and revive its long-lost ecosystem — one oyster at a time.
    https://www.cnn.com/2019/01/16/tech/billion-oyster-project/index.html

    Oyster Fact Sheet – Food, water filter, fish habitat. An adult oyster can filter as much as 50 gallons of water a day.
    https://www.cbf.org/about-the-bay/more-than-just-the-bay/chesapeake-wildlife/eastern-oysters/oyster-fact-sheet.html