Sponge farming04/11/2016April 11, 2016As fish stocks in the seas off Zanzibar dwindle, local fishermen are starting to farm sea sponges. Tourists love them and researchers are searching them for agents effective against cancer and viral infections.https://p.dw.com/p/1IT8NImage: Christian VaterlausAdvertisementFarming sponges in ZanzibarTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video