The Violet Tunicate is an invasive species of colonial tunicate (sea squirt) that is native to Asia (Japan, China) and was introduced to British Columbia where it was reported from French Creek on Vancouver Island in 1992 and later from Maple Bay on (in 2000) (Cohen 2011
). It is also known from the Strait of Georgia, Johnson Strait, the southwest coast of Vancouver Island and Haida Gwaii. (Royal BC Musuem 2011
The Invasive Species Compendium (2011) provides the following information on this species: "It can tolerate a wide range of environmental factors including temperature, salinity and nutrients (Carman et al., 2007; Dijkstra et al., 2008). B. violaceus overgrows shellfish (e.g. mussels) and other sessile invertebrate species".