The massive presence of mucilaginous organic matter, resulting from planktonic and benthic algal blooms, has become more frequent in many coastal waters around Europe, especially in the Adriatic. The appearance of mucilage in the Adriatic Sea has been reported periodically since 1800, with major mucus blooms during the 1990s [1]. The mucilage phenomenon of the Adriatic Sea had usually been related to extracellular organic matter of phytoplanktonic origin