An introduction of C. taxifolia
in southern California in 2000, presumably from the release
of aquarium specimens, cost *$7 million for eradication
efforts. Besides C. taxifolia, other Caulerpa species being
sold for aquarium use also may have the potential to invade
southern Californian and U.S. waters. Surveys of the
availability of Caulerpa species in southern California
aquarium retail stores in 2000–2001 revealed that 26 of 50
stores sold at least one Caulerpa species (52 %) with seven
stores selling C. taxifolia. In late 2001, California imposed
a ban on the importation, sale, or possession of nine
Caulerpa species; the City of San Diego expanded these
regulations to include the entire genus